Free and Premium ACDIS CCDS Dumps Questions Answers

ICD-10-CM Chapter 15 codes generally have sequencing priority over codes from other chapters when a condition complicates pregnancy, childbirth, or the puerperium.

Therefore, when pyelonephritis complicates pregnancy, the appropriate obstetric complication code is generally sequenced first, with additional code(s) used as instructed to identify the specific infection or organism.

This principle is important because ordinary principal-diagnosis logic can be modified by chapter-specific instructions. CDI specialists working with obstetric cases therefore must determine whether the pregnancy affects management and whether the condition is documented as complicating pregnancy.

The only major exception would be when the provider specifically determines that the pregnancy is incidental to the encounter and the applicable coding requirements for incidental pregnancy are met.

A symptom code does not generally supersede an established definitive diagnosis. Likewise, the fact that an infection could occur outside pregnancy does not negate Chapter 15 sequencing when it is complicating the pregnancy.

Correct gestational-age documentation is also important because an additional code may be required to identify the specific week of gestation.

CCDS Reference Topics: Obstetric coding; Chapter 15; sequencing priority; infection in pregnancy; principal diagnosis.

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A verbal query is the most efficient and appropriate action because the responsible physician is immediately available and the documentation gap has already been identified. CDI practice is not limited to written or electronic queries; verbal clarification is an accepted communication method when conducted compliantly.

The CDI specialist should present the relevant clinical indicators objectively and ask for clarification without directing the physician toward a preferred diagnosis. The conversation should remain clinically focused and must not mention reimbursement, MS-DRG impact, quality scoring, or other incentives.

Importantly, verbal does not mean informal or undocumented. Current query standards require organizations to maintain an auditable query process. Historically, ACDIS/AHIMA guidance has specifically required the essence of verbal queries to be memorialized, including the reason for clarification and relevant clinical indicators. The 2026 ACDIS/AHIMA Guidelines for Achieving a Compliant Query Practice supersede previous versions and remain the current foundational industry standard for query practice.

Waiting unnecessarily could delay clarification and interfere with concurrent CDI workflow. Since the physician is available, direct professional communication is preferable.

CCDS Reference Topics: Communication skills; verbal queries; concurrent CDI review; compliant query practice.

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Direct verbal communication can be an effective and appropriate CDI technique, particularly when the responsible physician is available and the issue can be clarified efficiently. The interaction must remain professional, clinically focused, and compliant with the organization's process for documenting or retaining verbal queries.

ACDIS specifically identifies collaboration with providers, verbal discussion, written queries, and resolution of missing, unclear, or conflicting documentation as core inpatient CDI responsibilities. The CCDS blueprint also tests situations in which personal or verbal communication may be preferable to written communication.

Option C is inappropriate because the CDI specialist should not direct the physician toward a diagnosis based on MS-DRG impact. The discussion should present the clinical issue neutrally and allow the physician to exercise independent clinical judgment.

There is also no rule requiring all queries to be electronic. Query format and retention should follow compliant organizational policies and current ACDIS/AHIMA standards. Waiting until final billing can unnecessarily delay resolution and undermine the advantages of concurrent CDI review.

Effective CDI communication balances clinical precision, efficiency, collegiality, and auditability.

CCDS Reference Topics: Verbal queries; physician communication; concurrent CDI; nonleading clarification; query documentation.

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The phrase “post-op ileus” establishes that the ileus occurred after surgery, but it does not necessarily establish that the ileus represents a reportable surgical complication rather than an expected transient consequence of abdominal surgery. The relationship and clinical significance therefore require clarification.

ICD-10-CM guidance on complications of care states that not every condition occurring during or following surgery is automatically classified as a complication. Code assignment depends on provider documentation establishing the relationship between the condition and the care or procedure, and the documentation must support clinical significance. When that relationship is unclear, the provider should be queried.

Assigning a complication code immediately would therefore be premature. Likewise, simply coding postoperative ileus without resolving whether it represents expected postoperative physiology or a clinically significant complication could misrepresent the episode.

Escalation to a physician advisor or CDI manager is unnecessary as the first action because this is a standard documentation-clarification issue that can be addressed directly through a compliant provider query.

CCDS Reference Topics: Official Guidelines—complications of care; medical record documentation; compliant provider clarification.

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The observed-to-expected mortality ratio is calculated as:

80 observed deaths ÷ 100 expected deaths = 0.80.

A ratio below 1.0 means observed mortality is lower than predicted. In this case, the number of observed deaths is 20% below the expected number.

Accurate interpretation of mortality data is important for CDI because documentation contributes to the clinical information used by many risk-adjustment methodologies. If significant comorbidities or acute conditions are inadequately documented, the coded record may not fully represent the patient's severity or mortality risk.

However, CDI professionals must avoid treating risk-adjustment improvement as justification for unsupported diagnoses. Documentation should accurately represent conditions that were clinically present, evaluated, treated, monitored, or otherwise reportable according to applicable rules.

The official CCDS content outline specifically includes severity of illness/risk of mortality, physician documentation effects on public reporting, and analysis of hospital performance among its expected competencies.

Mortality ratios should also be interpreted in context; they are influenced by patient population, model methodology, documentation, coding accuracy, and actual clinical outcomes.

CCDS Reference Topics: O/E mortality; ROM; risk adjustment; quality outcomes; CDI program analysis.

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The record contains uncertainty regarding whether the documented ileus represents expected postoperative physiology or a clinically significant complication, making provider clarification appropriate.

Temporary impairment of gastrointestinal motility is common following abdominal surgery. Therefore, the mere occurrence of an ileus after surgery does not automatically establish a complication of care. Conversely, prolonged or clinically significant postoperative ileus requiring substantial treatment, extended hospitalization, nasogastric decompression, or other interventions may warrant distinct documentation.

The CDI specialist must not infer the complication relationship solely from timing. The Official Guidelines emphasize that a condition occurring after medical or surgical care is not automatically classified as a complication; appropriate provider documentation of the relationship and clinical significance is required where applicable.

Option C is also incorrect because postoperative ileus can be a reportable condition when clinically significant and appropriately documented. Option D substitutes a separate diagnosis without provider support.

The query should provide relevant duration, symptoms, imaging, diet status, nasogastric tube use, treatment, and expected postoperative course while allowing the surgeon to characterize the condition.

CCDS Reference Topics: Postoperative ileus; complications of care; postoperative documentation; clinical clarification.

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Pressure-ulcer staging is one of the recognized circumstances in which ICD-10-CM permits the relevant clinical detail to be obtained from documentation by an appropriate non-provider clinician, such as a qualified wound-care nurse.

The provider establishes the medical diagnosis, while the wound-care clinician's specialized assessment may support the stage assignment. This distinction allows coding to reflect the expertise of clinicians who directly assess the wound without requiring physicians to duplicate every technical staging statement.

Option C is too broad. The exception permitting stage documentation from another clinician does not grant non-provider documentation unrestricted authority to establish all reportable medical diagnoses.

Pressure-ulcer stage is highly relevant because ICD-10-CM pressure-ulcer codes incorporate both anatomical site and stage. It can also have substantial implications for severity reporting, POA assessment, CMS HAC policy, nursing care, quality review, and risk adjustment.

When different clinicians document conflicting stages, clarification should be pursued rather than selecting the most severe value.

CCDS candidates should understand the distinction between provider-established diagnoses and specific coding elements that ICD-10-CM permits to originate from other qualified professionals.

CCDS Reference Topics: Pressure ulcers; wound staging; non-provider documentation; coding exceptions.

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Among the listed diagnoses, acute diastolic heart failure has the greatest potential MS-DRG impact because ICD-10-CM code I50.31 is classified as an MCC under the FY 2026 CMS MS-DRG system. CMS specifically identifies I50.31 as an MCC, whereas diagnoses classified only as a CC generally produce a lower severity level within DRG families that distinguish no CC/MCC, CC, and MCC cases.

Acute kidney injury, commonly represented by N17.9 when unspecified, is generally a CC rather than an MCC; CMS examples demonstrate N17.9 functioning as a CC in MS-DRG assignment. COPD with acute exacerbation and many delirium diagnoses may also affect severity assignment, but they do not exceed the MCC effect of qualifying acute heart failure in the standard hierarchy represented here.

The wording “monetary impact” must not be interpreted as permission to pursue diagnoses for financial gain. CDI professionals should query only when clinical indicators justify clarification. Reimbursement is a consequence of accurate documentation and coding, not the clinical justification for creating a diagnosis.

The actual payment impact also depends on the principal diagnosis, existing MCCs, procedures, payer methodology, and final MS-DRG.

CCDS Reference Topics: CC/MCC hierarchy; MS-DRG reimbursement; acute heart failure; compliant CDI practice.

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An MS-DRG relative weight represents relative expected resource consumption, not a direct severity score or mortality probability. Therefore, a relative weight of approximately 2.0 means the MS-DRG is associated with roughly twice the resource intensity of the average case represented by the standardized reference point.

CMS calculates and recalibrates MS-DRG relative weights using national hospital data as part of IPPS rate setting. The FY 2026 final-rule materials include the MS-DRG weighting factors as well as supporting cost data used in the relative-weight methodology.

Clinically complex cases often consume more resources, so relative weight may correlate with severity. However, it is not equivalent to a patient's severity-of-illness score or risk-of-mortality score. Likewise, hospitals do not simply multiply their billed charges based on the DRG weight. IPPS payment involves the standardized amount plus various adjustments, including wage index and other applicable payment factors.

For CDI, accurate documentation matters because diagnoses and procedures drive MS-DRG assignment, and the assigned MS-DRG carries its specific relative weight.

CCDS Reference Topics: IPPS; MS-DRG relative weight; resource consumption; reimbursement methodology.

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The laboratory findings demonstrate reduction in all three major peripheral blood-cell lines: hemoglobin 7.8 indicates anemia, WBC 2,700 indicates leukopenia, and platelets 58 indicate thrombocytopenia. Collectively, this pattern is consistent with pancytopenia, making option C the most appropriate documentation clarification.

The National Cancer Institute defines pancytopenia as a lower-than-normal number of red blood cells, white blood cells, and platelets. Importantly, pancytopenia describes the hematologic state; it does not establish its underlying etiology. Myelodysplastic syndrome was only being ruled out in the scenario, so the CDI specialist should not infer it as the definitive cause.

Thrombocytopenia alone would capture only one component of the abnormal CBC and would fail to represent the simultaneous anemia and leukopenia. Myelophthisis implies marrow displacement or infiltration and cannot be inferred from these counts alone. Likewise, aplastic anemia is a specific bone-marrow failure diagnosis requiring provider determination and supporting diagnostic evaluation.

A compliant query can present pancytopenia as a clinically supported choice while allowing the provider to document another explanation.

CCDS Reference Topics: Hematology; clinical indicators; medical terminology; compliant query opportunity.

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PACT stands for Post-Acute Care Transfer. The PACT policy is part of Medicare's IPPS transfer-payment framework and can modify the normal full MS-DRG payment when a qualifying inpatient stay ends with an early transfer or discharge to specified post-acute settings.

CMS applies transfer-payment methodology when applicable conditions are met, including circumstances involving selected discharges to skilled nursing facilities, inpatient rehabilitation facilities, long-term care hospitals, psychiatric facilities, and certain home-health arrangements. For home health, the timing and relationship of post-discharge care can be relevant.

The policy exists because a short acute-care hospitalization followed by transfer to another care setting may not involve the same hospital resource utilization as a conventional discharge completing the expected course of inpatient treatment. Accordingly, the transferring hospital may receive a calculated transfer payment rather than the unrestricted full MS-DRG amount.

For CDI professionals, PACT illustrates why accurate discharge disposition and documentation can affect reimbursement even when the principal diagnosis, procedures, CCs, and MCCs are correctly captured.

CCDS Reference Topics: IPPS; MS-DRG reimbursement; discharge disposition; transfer payment policy.

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A condition documented in the medical record does not automatically qualify as a reportable secondary diagnosis. For inpatient coding, additional diagnoses generally must be clinically significant during the current hospitalization. Qualifying significance includes clinical evaluation, therapeutic treatment, diagnostic procedures, an extended length of stay, or increased nursing care and/or monitoring.

Here, GERD is merely part of the patient's historical medical background and does not affect current management. Therefore, it generally should not be reported as an additional diagnosis solely because it appears in the past medical history.

Whether a diagnosis is classified as a CC or MCC is a separate issue. A condition must first satisfy applicable reporting requirements before its MS-DRG severity classification matters. CDI specialists should never encourage coding of clinically irrelevant historical conditions merely because they could affect reimbursement.

This principle protects the clinical integrity of coded data and prevents inappropriate inflation of disease burden. CDI review should focus on conditions that meaningfully describe the patient's current hospitalization, treatment requirements, clinical risk, and resource consumption.

CCDS Reference Topics: Reporting additional diagnoses; secondary-diagnosis criteria; medical-record review; resource utilization; coding compliance.

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For POA reporting, “present on admission” refers to a condition present at the time the order for inpatient admission occurs. Conditions that develop during an outpatient encounter—including emergency-department, observation, or outpatient surgery care—before the inpatient admission order are generally considered POA when they are present at that inpatient admission point.

Therefore, the NSTEMI in this scenario is considered present on admission even though it developed after the patient physically arrived at the hospital.

This distinction is essential because hospital arrival and inpatient admission are not synonymous for POA purposes. A patient may spend hours in the ED or observation status before an inpatient order is entered.

The POA indicator applies to applicable principal and secondary diagnoses and is important to CMS's HAC payment provisions as well as quality analysis. A condition does not become hospital acquired merely because it arose somewhere on hospital premises before inpatient status began.

CDI specialists should clarify timing when the record does not establish whether a diagnosis existed before or after the inpatient admission order rather than relying solely on note timestamps or physical location.

The FY 2026 ICD-10-CM Official Guidelines contain the governing POA definitions and reporting rules.

CCDS Reference Topics: POA; emergency department; observation; timing of diagnosis; HAC payment logic.

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The presentation is most consistent with delirium, an acute and fluctuating disturbance in attention, awareness, and cognition that frequently develops in medically ill hospitalized patients.

The abrupt onset over several days and fluctuating cognitive state distinguish delirium from most forms of dementia, which generally develop progressively over months or years. Infection, medications, metabolic abnormalities, dehydration, hypoxia, and organ dysfunction are common precipitants.

A urinary infection may be a contributing clinical factor, but CDI should not automatically establish a cause-and-effect relationship between infection and delirium unless supported by provider documentation.

The CDI specialist should also recognize that terms such as “altered mental status” are symptoms rather than equivalent substitutes for a more specific diagnosis. When the clinical record contains sufficient indicators and the provider has documented only nonspecific mental-status terminology, a query may be warranted.

Intellectual disability represents a developmental condition rather than an acute change in cognition. A persistent vegetative state represents profound and persistent impairment of consciousness and is inconsistent with the described fluctuating presentation.

CCDS Reference Topics: Delirium; altered mental status; cognitive disorders; clinical indicators; documentation specificity.

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Severe protein-calorie malnutrition is the correct answer. This question is adapted from an official CCDS sample question published by ACDIS.

Under the FY 2026 MS-DRG Definitions Manual, E43, unspecified severe protein-calorie malnutrition, is classified as an MCC. In contrast, moderate and mild protein-calorie malnutrition codes are classified as CCs rather than MCCs.

An MCC can materially affect MS-DRG assignment when the applicable DRG family differentiates cases by MCC status and when no exclusion or other grouper rule prevents the effect. However, the financial effect is never sufficient justification for a query. Documentation must be clinically supported and reflect the patient's actual condition.

A dietitian may document detailed nutrition findings and malnutrition criteria, but the reportable diagnosis ordinarily requires documentation by the provider responsible for establishing diagnoses. Therefore, when strong nutritional indicators exist but the provider has not documented malnutrition, a compliant query may be appropriate.

For CCDS preparation, candidates should understand both the clinical characteristics of malnutrition and its coding/reimbursement classification.

CCDS Reference Topics: MCCs; malnutrition; MS-DRG methodology; documentation requirements; IPPS.

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In the inpatient hospital setting, an uncertain diagnosis documented at discharge using terminology such as possible, probable, suspected, likely, questionable, compatible with, or consistent with may generally be coded as though the condition existed or was established.

Therefore, “possible gram-negative pneumonia” may be coded in accordance with the inpatient uncertain-diagnosis guideline when it remains the final diagnostic conclusion.

The rationale is that inpatient diagnostic evaluation and treatment frequently occur before absolute confirmation is available, and the patient may have been managed as though the suspected disease were present.

This rule is materially different from outpatient coding, where uncertain diagnoses are generally not coded as established and the documented signs, symptoms, or confirmed conditions are reported instead.

The presence of the uncertain terminology alone does not mandate a query. A query would be appropriate if documentation is contradictory, if the diagnosis is clinically unsupported, or if another documentation issue prevents correct code assignment.

CDI specialists need to recognize this inpatient-specific rule because unnecessary queries for “possible” or “probable” diagnoses can create physician burden without improving coding accuracy.

CCDS Reference Topics: Uncertain inpatient diagnoses; discharge documentation; pneumonia; inpatient versus outpatient coding.

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CMS publishes the complete MCC and CC lists as part of the FY 2026 IPPS Final Rule supporting tables. Specifically, the FY 2026 final-rule page identifies Table 6I as the Complete MCC List and Table 6J as the Complete CC List, along with additions, deletions, and the CC exclusion list.

These files are critical reference resources when assessing MS-DRG severity logic. Nevertheless, classification as an MCC or CC does not automatically mean that the diagnosis changes a particular case's MS-DRG. Principal-diagnosis exclusions, procedure logic, DRG structure, and the presence of another MCC can affect whether a diagnosis alters final assignment.

The Hospital Consumer Assessment survey relates to patient experience rather than diagnosis severity classification. The Physician Fee Schedule governs professional reimbursement and does not contain the inpatient MS-DRG MCC/CC classification system. National Coverage Determinations address Medicare coverage for particular services rather than MS-DRG severity categories.

CDI specialists should use the current CMS version applicable to the discharge date. CMS identifies MS-DRG Version 43.1 as effective April 1 through September 30, 2026.

CCDS Reference Topics: MCC; CC; CMS Definitions Manual; IPPS; MS-DRG severity.

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Physician 4 has the most favorable risk-adjusted mortality rate, at 1.3, compared with Physician 1 at 1.5, Physician 2 at 2.0, and Physician 3 at 2.5. Although Physician 1 has fewer observed deaths and an observed mortality rate of 1.6%, public outcome comparisons commonly incorporate risk adjustment rather than relying solely on raw mortality. Risk adjustment attempts to account for differences in patient complexity, comorbid disease burden, demographic factors, and other characteristics that influence expected outcomes.

This is directly relevant to CDI because incomplete documentation of clinically significant comorbidities can understate patient severity and therefore adversely affect the expected mortality component of risk-adjusted performance calculations. Conversely, accurate documentation allows coded data to represent the actual severity and risk of the population being treated. Healthgrades specifically states that its mortality methodology adjusts for patient risk factors to permit more meaningful comparisons of clinical outcomes.

The CCDS content outline specifically requires knowledge of mortality indices, severity of illness/risk of mortality, physician performance, and the effect of documentation on publicly reported data.

CCDS Reference Topics: Impact of reportable diagnoses on quality of care; Healthcare facility CDI program analysis; mortality index and risk adjustment.

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The abrupt increase in serum creatinine and reduction in urine output strongly support consideration of acute kidney injury (AKI). The patient's creatinine approximately doubled from the established baseline within a short period, and the episode follows significant hypotension, a recognized cause of acute renal hypoperfusion and potentially ischemic tubular injury.

Chronic kidney disease cannot be established from an acute creatinine change alone. CKD requires evidence that renal abnormalities persist chronically, generally over a period of at least several months. End-stage renal disease represents advanced chronic renal failure and is clearly unsupported by this scenario. Nephrotic syndrome would require a different constellation, particularly substantial proteinuria, hypoalbuminemia, and edema.

The CDI specialist should not independently diagnose AKI based solely on laboratory values. Rather, these findings provide the clinical basis for a neutral provider query if the diagnosis has not been documented. Relevant indicators could include baseline and current creatinine, urine output, hypotension, fluid resuscitation, nephrology assessment, medications, and renal replacement therapy if applicable.

The CCDS competency framework expects candidates to interpret renal laboratory findings and recognize clinically significant documentation opportunities.

CCDS Reference Topics: Acute kidney injury; renal pathophysiology; creatinine trends; clinical indicators.

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The most meaningful indicator is an increased volume of appropriately supported cases grouping to respiratory infection DRGs. The stated purpose of the pilot is not merely to obtain more physician responses; it is specifically to improve documentation of the type or etiology of pneumonia.

When providers document clinically supported pneumonia specificity—for example, an identified bacterial etiology or another qualifying respiratory infection—the coded case may move from a less specific/simple pneumonia grouping into a respiratory infections and inflammations DRG family, depending on the final diagnoses and grouper logic. A trend toward the expected DRG distribution can therefore demonstrate that the form is accomplishing its documentation objective.

Provider response and agreement rates are valuable CDI process metrics, but neither proves that useful specificity was obtained. A physician could respond to every query without adding meaningful diagnostic detail. Likewise, an increase in simple pneumonia DRGs would suggest that the intended specificity is not being captured effectively.

A robust CDI analysis should also verify that any DRG shift reflects clinically valid documentation rather than query pressure or reimbursement-oriented behavior.

CCDS Reference Topics: CDI metrics; query effectiveness; pneumonia specificity; MS-DRG trend analysis.

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The wound care nurse's documentation may be used to establish the stage of a pressure ulcer, making option D correct. ICD-10-CM provides specific exceptions to the general rule that diagnosis code assignment is based on documentation by a provider legally accountable for establishing diagnoses. Pressure-ulcer staging is one of the clinical details that may be derived from documentation by qualified non-provider clinicians involved in the patient's care.

Wound care nurses possess specialized expertise in pressure-injury assessment and commonly document staging based on tissue involvement. Current ICD-10-CM guidance directs assignment of the pressure-ulcer stage according to clinical documentation and provides specific rules for unstageable ulcers, healing ulcers, and ulcers that progress during hospitalization.

This exception does not mean that a wound-care nurse independently establishes every element of the medical diagnosis for coding purposes. The provider documentation remains central to identifying the pressure-ulcer diagnosis and relevant clinical condition, while the stage may come from qualified clinician documentation.

POA assignment follows separate reporting rules and is based on whether the condition was present at the time inpatient admission occurred.

CCDS Reference Topics: Pressure ulcers; non-provider documentation; staging; coding conventions.

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CMS's Hospital-Acquired Condition payment framework specifically identifies Stage III and Stage IV pressure ulcers among the defined HAC categories when applicable conditions are not present on admission.

The distinction is important because not every pressure injury automatically triggers HAC payment treatment. Stage and POA status therefore require accurate documentation.

A hospital-acquired pressure ulcer remains reportable even when HAC payment provisions apply. CMS does not instruct hospitals to suppress or omit such conditions. Instead, defined HAC diagnoses that are not POA may lose the CC/MCC payment effect they otherwise would contribute to the MS-DRG, subject to applicable grouper rules.

The CDI specialist should ensure that wound location, laterality when relevant, stage, progression, and timing are accurately documented. Qualified wound-care nurse documentation may be used for pressure-ulcer staging under the ICD-10-CM non-provider documentation exception, while the diagnosis itself remains subject to provider-documentation requirements.

CDI professionals must also distinguish the HAC/POA MS-DRG payment provision from the separate HAC Reduction Program, which reduces applicable hospital payments by 1% for hospitals in the worst-performing quartile.

CCDS Reference Topics: HACs; pressure ulcers; POA; MS-DRG adjustment; wound documentation.

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When a pressure ulcer progresses to a higher stage during an inpatient stay, ICD-10-CM instructs reporting that preserves both its stage at admission and the highest stage reached during hospitalization.

Therefore, the stage 3 condition present at admission and subsequent progression to stage 4 must both be represented according to the applicable coding instructions.

This approach accurately portrays both the patient's baseline condition and deterioration after admission. Reporting only stage 4 would lose important POA information, while reporting only stage 3 would fail to capture the subsequent clinical severity.

An unstageable pressure-ulcer code is not appropriate simply because the wound changed stages. “Unstageable” has a specific clinical meaning—typically the true depth cannot be determined because the wound base is obscured by slough or eschar or another specified circumstance.

CDI review should ensure documentation includes wound location, stage, laterality when applicable, timing of progression, and relevant wound-care assessment. Qualified wound clinicians may provide pressure-ulcer staging information under applicable non-provider documentation rules.

CCDS Reference Topics: Pressure ulcers; progression; POA; wound staging; quality reporting.

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The principal diagnosis is the condition established after study to be chiefly responsible for occasioning the patient's admission to the hospital for care. This is the UHDDS definition used in the ICD-10-CM Official Guidelines for inpatient principal-diagnosis selection.

“After study” is critical. The diagnosis initially suspected in the emergency department may change after diagnostic testing, consultation, treatment response, surgery, pathology, or other evaluation. The final principal diagnosis therefore may differ from the first diagnosis documented.

Relative weight does not determine principal diagnosis. A hospital cannot select a higher-paying condition merely because it produces a more favorable MS-DRG. Similarly, medication volume is not a principal-diagnosis criterion.

For CDI specialists, principal-diagnosis review requires understanding the circumstances surrounding admission, the diagnostic workup, final provider documentation, sequencing conventions, and any chapter-specific guidelines. When two conditions are documented and it is unclear which chiefly occasioned the admission, a provider query may be warranted.

The CCDS content outline specifically tests the principles and application of principal-diagnosis assignment.

CCDS Reference Topics: Principal diagnosis; UHDDS; inpatient sequencing; working MS-DRG.

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The principal concern is the selective destruction of unanswered queries. A compliant query-retention policy should be consistent, defensible, and auditable rather than dependent on whether the physician provided a response or whether the query affected billing.

Organizations may structure query retention differently depending on legal requirements, health-record policy, technology, and organizational governance. Queries may be part of the permanent health record or retained as another retrievable business record, depending on policy. The key point is that disposition should not be manipulated to hide unanswered or inconvenient clarification activity.

Destroying unresolved queries can impair auditability, create an appearance that the organization is selectively preserving only favorable documentation activity, and undermine the integrity of the CDI process.

The 2026 ACDIS/AHIMA guidelines are the current foundational standard for query-practice design and supersede prior versions.

A query need not automatically remain in the permanent medical record forever; retention requirements depend on applicable organizational and legal policies. What is unacceptable is an inconsistent approach designed to remove evidence based on outcome.

CCDS Reference Topics: Query retention; compliance; auditability; organizational policy; documentation integrity.

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The CDI specialist should first review the final coded record together with the Coding Clinic guidance identified by the coder. This provides an objective basis for understanding why the final MS-DRG differs from the CDI working DRG.

A mismatch does not automatically indicate that either CDI or coding made an error. Working DRGs are provisional and may change after complete review of discharge documentation, operative reports, pathology, final diagnostic information, coding conventions, official guidelines, or authoritative Coding Clinic advice.

Reviewing the applicable guidance before contacting the coder promotes an informed and efficient reconciliation process. Once the specialist understands the coding rule, discussion with the coder may still be useful if ambiguity remains. Immediately escalating to the coding manager is unnecessary unless the issue cannot be resolved through normal collaboration. Forwarding the record without investigating the mismatch would defeat the purpose of a reconciliation process and could allow recurring education opportunities to remain unidentified.

Mismatch analysis is a valuable CDI quality metric because it can identify documentation gaps, coding-knowledge issues, changes in authoritative guidance, and opportunities to improve CDI/coding alignment.

CCDS Reference Topics: MS-DRG reconciliation; CDI/coder collaboration; Coding Clinic application; CDI program analysis.

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The findings are characteristic of a large or massive pleural effusion. Pleural fluid produces dullness to percussion and diminished breath sounds because fluid within the pleural space reduces normal transmission of respiratory sounds and replaces the normally air-filled acoustic environment.

A sufficiently large effusion can cause complete or near-complete opacification of a hemithorax on chest radiography. Importantly, a large-volume effusion exerts mass effect and can push the mediastinum away from the affected side, producing contralateral mediastinal shift. That combination strongly supports pleural effusion as the appropriate diagnostic clarification.

Pneumonia can produce focal opacity and abnormal breath sounds, but extensive consolidation often causes air bronchograms and typically does not create the same fluid-related contralateral mass effect. Atelectasis can opacify a hemithorax but usually pulls the mediastinum toward the affected side because of volume loss. Bronchiectasis has different radiographic characteristics, including chronic bronchial dilation. Heart failure may cause pleural effusions but does not itself describe the immediate radiographic abnormality being presented.

A CDI query should seek provider confirmation rather than independently diagnose the effusion.

CCDS Reference Topics: Pleural disease; chest radiographic interpretation; pulmonary clinical indicators; diagnostic clarification.

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A high volume of unanswered queries most directly indicates inadequate provider engagement. This question is adapted from the current ACDIS Candidate Handbook's publicly released CCDS sample questions.

A provider may legitimately agree or disagree with a CDI query. Disagreement does not necessarily indicate poor engagement because the purpose of a query is clarification, not obtaining a predetermined diagnosis. A physician who reviews the clinical information and documents that the condition is ruled out, clinically undetermined, or otherwise different from the proposed possibilities is still participating appropriately.

Likewise, the number of queries generated is primarily a CDI workload or opportunity metric. It does not demonstrate whether physicians are responding.

A persistent nonresponse rate is more concerning because unanswered queries can delay final coding, create unresolved ambiguity, affect billing timeliness, reduce documentation completeness, and indicate weaknesses in provider communication or organizational query escalation procedures.

A CDI manager should not evaluate engagement from a single metric in isolation. Response time, response rate, education participation, documentation trends, service-line differences, and escalation frequency provide additional useful context.

CCDS Reference Topics: Physician engagement; query-response metrics; CDI analytics; program effectiveness.

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For an inpatient discharge, a diagnosis documented as “probable” may be coded as though the condition existed or was established when it remains documented as such at discharge.

The FY 2026 ICD-10-CM Official Guidelines provide a specific inpatient rule for uncertain diagnoses documented at the time of discharge. Terms such as probable, suspected, likely, questionable, possible, still to be ruled out, compatible with, and consistent with are coded as if the condition existed, because the diagnostic workup and treatment generally correspond to the suspected condition.

Therefore, aspiration pneumonia—not merely the respiratory symptoms—is the appropriate condition to code in this scenario.

This rule is specific to inpatient hospital coding and should not be generalized to outpatient encounters, where uncertain diagnoses are handled differently and symptoms or confirmed conditions are generally reported instead.

A query would still be appropriate if the documentation were contradictory, clinically ambiguous, or if multiple competing diagnoses remained without sufficient clarification. But the word “probable” itself does not create a mandatory inpatient query.

CCDS Reference Topics: Inpatient uncertain diagnoses; aspiration pneumonia; discharge documentation; Official Guidelines.

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Megestrol acetate is the correct choice. This item is adapted from an official ACDIS CCDS sample question in the Candidate Handbook, where Megace—megestrol acetate—is identified as the appropriate appetite-stimulating medication.

Megestrol acetate is a synthetic progestational agent with recognized appetite-stimulating effects. Current U.S. prescribing information specifically identifies megestrol acetate oral suspension for anorexia, cachexia, or significant unexplained weight loss in patients with AIDS. Its use illustrates why CDI specialists need functional knowledge of pharmacology: medication profiles can provide clinically relevant clues to diagnoses under evaluation, although a medication alone never establishes a reportable diagnosis.

Memantine is primarily used in Alzheimer's disease and is not an appetite stimulant. Levothyroxine replaces thyroid hormone in hypothyroidism. Sibutramine was historically used for weight reduction rather than cachexia and is therefore directionally opposite to the desired effect.

In CDI review, identification of megestrol may prompt assessment of the record for malnutrition, cachexia, malignancy-related weight loss, HIV-associated wasting, or another underlying cause, but the provider must document the diagnosis.

CCDS Reference Topics: Pharmacology; cachexia; nutrition disorders; clinical indicators.

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The high-risk practice is destroying unanswered queries. Query retention should be governed by an established organizational policy and should not depend on whether the provider answers the query. Selectively destroying unanswered queries can create significant compliance, audit, and record-integrity concerns because it removes evidence of the documentation-clarification process.

ACDIS/AHIMA guidance has consistently required organizations to establish query-retention policies. Queries may be retained as part of the permanent health record or maintained as a retrievable business record according to organizational policy and legal requirements. The current 2026 ACDIS/AHIMA query practice guidance supersedes all previous editions, reinforcing the importance of a standardized, defensible query process.

Keeping queries in the health record is not inherently problematic when policy defines them as part of that record. Likewise, a new diagnosis may be included in a multiple-choice query when it is supported by patient-specific clinical indicators and the choices remain nonleading. A yes/no query can also be compliant in defined circumstances, such as clarification of a diagnosis or relationship already documented.

Selective destruction is therefore the clear compliance risk.

CCDS Reference Topics: Query retention; compliance; organizational query policy; audit integrity.

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The most clinically supported clarification is acute cerebral infarction. A transient ischemic attack is characterized by transient neurologic dysfunction without acute infarction. In this scenario, the patient's slurred speech has resolved, but the right-sided weakness persists, and CT demonstrates a new hypodense cerebral area. Together, those findings raise substantial concern for an established ischemic infarction rather than a completely transient event.

The CDI specialist should not independently convert the diagnosis of TIA to cerebral infarction. Instead, the persistent focal deficit and imaging findings establish an appropriate clinical basis for a provider query asking whether the final diagnosis is acute cerebral infarction, TIA, another neurologic condition, or clinically undetermined.

Acute encephalopathy generally produces global cerebral dysfunction rather than the focal unilateral weakness described here. Transient global amnesia predominantly affects memory formation and would not explain persistent unilateral motor deficits. Transient cerebral ischemia/TIA becomes less consistent once objective evidence of acute infarction and persistent neurologic impairment is present.

Accurate clarification is important because cerebral infarction and TIA differ substantially in coding, severity representation, quality reporting, and secondary-prevention planning.

CCDS Reference Topics: Neurologic clinical indicators; cerebral infarction versus TIA; diagnostic clarification; medical record specificity.

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The record supports a cause-and-effect clarification query. The presence of an indwelling central line together with bacteremia does not automatically establish a catheter-related bloodstream infection or device complication.

The provider must determine whether the infection is related to the catheter, another source, or an undetermined cause when the classification requires clinical linkage. CDI should present the catheter history, onset of fever, culture results, line assessment, treatment, line removal or exchange if applicable, and other relevant findings without directing the provider toward a device-related complication.

A positive blood culture likewise does not independently establish sepsis. Bacteremia and sepsis are distinct concepts; the provider must make the systemic infection diagnosis using the entire clinical picture.

Automatically assigning a complication merely because a device is present risks inaccurate reporting of healthcare-associated complications and may affect quality metrics, reimbursement, and public data.

Current ACDIS/AHIMA guidance emphasizes that queries should arise from patient-specific clinical information and preserve provider clinical judgment rather than presuming causal relationships.

CCDS Reference Topics: Device-related infections; cause-and-effect relationships; bacteremia; clinical indicators; compliant query construction.

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For a pregnant patient, the first coding consideration is the Chapter 15 obstetric guideline unless the provider explicitly documents that the pregnancy is incidental to the encounter. ICD-10-CM codes from O00-O9A have sequencing priority over codes from other chapters when a condition complicates pregnancy, childbirth, or the puerperium.

Therefore, although the patient's underlying clinical disease is Clostridium difficile enteritis, the principal-diagnosis analysis begins with the applicable pregnancy-complication code. An additional infectious-disease code would then be used as appropriate to identify the specific infection. The infectious and parasitic disease chapter does not override the obstetric sequencing rules.

Signs such as diarrhea, cramps, nausea, and vomiting are also not the principal coding focus once a definitive diagnosis—C. difficile enteritis—has been established. Similarly, an etiology/manifestation sequencing convention is not the controlling rule in this scenario.

The critical CCDS concept is recognition of chapter-specific sequencing rules. A CDI specialist reviewing pregnant patients must recognize that otherwise standard principal-diagnosis logic may be superseded by obstetric instructions.

CCDS Reference Topics: Official Guidelines for Coding and Reporting—Chapter 15; principal diagnosis selection; chapter-specific sequencing.

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When severe sepsis is documented, coding requires the underlying systemic infection first, followed by the appropriate severe-sepsis code and additional code(s) for the acute organ dysfunction. Therefore, the sepsis code is sequenced first, followed by the severe-sepsis code and acute kidney injury.

The FY 2026 ICD-10-CM Official Guidelines state that severe sepsis requires at least two codes: one for the underlying systemic infection and another from subcategory R65.2-. Additional codes identify associated acute organ dysfunction. A code from R65.2- cannot serve as the principal diagnosis.

The UTI identifies the localized source but does not replace the systemic infection as principal diagnosis when sepsis is the condition chiefly responsible for admission. Likewise, the AKI is a manifestation of the severe systemic process and is not sequenced before the sepsis in this scenario.

For CDI specialists, the essential documentation element is the relationship between sepsis and the acute organ dysfunction. Organ dysfunction alone does not automatically permit severe-sepsis coding; provider documentation must establish the association when it is not inherent.

CCDS Reference Topics: Sepsis; severe sepsis; organ dysfunction; sequencing; principal diagnosis.

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The documented behavioral characteristics most strongly support clarification of alcohol dependence. The record describes increased tolerance, continued alcohol use despite recognized medical harm, and unsuccessful efforts to stop drinking. These features reflect a persistent maladaptive pattern with physiologic and behavioral characteristics associated with dependence/alcohol use disorder.

Alcohol intoxication identifies the acute effect of recent consumption but does not describe the patient's underlying pattern of alcohol use. Therefore, the CDI opportunity is to clarify whether a chronic alcohol-related disorder such as dependence is present when clinically supported.

Withdrawal is not established merely because a dependent patient is hospitalized. Withdrawal requires symptoms occurring after reduction or cessation of alcohol exposure, potentially including tremor, autonomic hyperactivity, nausea, anxiety, seizures, hallucinations, or agitation. Delirium tremens represents a severe alcohol-withdrawal syndrome involving delirium and marked autonomic disturbance and is not supported by the scenario.

“Abuse” is less consistent with the pronounced dependence-type behaviors provided. The CDI specialist should nevertheless frame the query neutrally and allow the physician to identify dependence, abuse, another alcohol-related condition, or inability to determine.

CCDS Reference Topics: Substance-related disorders; alcohol dependence; intoxication versus withdrawal; clinical indicators.

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The clinical presentation most strongly supports clarification of hypovolemic shock, specifically hemorrhagic shock in the context of traumatic splenic bleeding. Profound hypotension at 80/60 mmHg, extreme tachycardia at 160 beats/min, substantial crystalloid resuscitation, transfusion of three units of packed red blood cells, and vasopressor support demonstrate severe circulatory compromise.

Acute blood loss anemia may also be present and should be documented when clinically supported, but it does not fully represent the patient's hemodynamic instability. Shock describes failure of effective tissue perfusion and therefore more accurately captures the immediate physiologic severity.

SIRS due to trauma is less specific than the evident volume-loss state and would not adequately describe the hemorrhagic circulatory collapse. The record already identifies splenic laceration; “ruptured spleen” should not be substituted without provider confirmation and appropriate operative/imaging evidence.

For CDI purposes, this is a classic situation in which documentation of only the anatomical injury understates the patient's physiologic acuity. A neutral query can present the documented hypotension, tachycardia, transfusion, fluids, and vasoactive treatment and request clarification of the associated condition.

CCDS Reference Topics: Shock; trauma; hemorrhage; acute blood loss; severity-of-illness documentation.

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A line graph showing Risk of Mortality (ROM) and Severity of Illness (SOI) by month provides the strongest evidence of program impact over time because it displays longitudinal trends. Hospital leadership can readily determine whether documented patient complexity and risk profiles are increasing, decreasing, or remaining stable and can correlate those trends with CDI interventions.

The CCDS content outline specifically requires CDI specialists to analyze program trends, use SOI/ROM and other program-performance methodologies, create forecasting data, evaluate hospital performance, and track metrics over time. A line graph is particularly appropriate because time is the independent variable and changes from month to month are immediately visible.

An individual specialist's query rate primarily measures productivity or workflow rather than overall organizational impact. A pie graph of unanswered queries provides a snapshot of one process metric, not longitudinal program effectiveness. A presentation of program goals and objectives communicates strategy but does not demonstrate measurable results.

ROM and SOI also connect CDI work to quality and risk-adjustment outcomes, making them particularly meaningful to senior hospital administration.

CCDS Reference Topics: Healthcare facility CDI program analysis; trend analysis; SOI/ROM; physician and hospital performance.

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The record presents a legitimate opportunity to clarify the type or etiology of pneumonia, particularly whether aspiration contributed to the pulmonary infection. Dysphagia following stroke, documented aspiration during oral intake, fever, hypoxia, and a dependent-lobe infiltrate form a clinically relevant pattern.

However, the CDI specialist cannot independently convert unspecified pneumonia into aspiration pneumonia. Likewise, the speech-language pathologist can provide valuable clinical evidence regarding swallowing dysfunction and aspiration risk, but that documentation does not independently establish the medical diagnosis of aspiration pneumonia for coding purposes.

A compliant query should objectively present the pertinent indicators and allow the provider to identify aspiration pneumonia, another pneumonia type, pneumonitis, another condition, or inability to determine.

Automatically assigning both bacterial and aspiration pneumonia would also be inappropriate because neither bacterial etiology nor a separate second pneumonia diagnosis has been established.

The current ACDIS/AHIMA guidance emphasizes that queries should arise from the clinical record and preserve the provider's independent judgment rather than directing a preferred diagnosis.

CCDS Reference Topics: Pneumonia specificity; aspiration; dysphagia; interdisciplinary documentation; compliant query development.

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An unanswered clinically significant query should be managed through the organization's defined escalation process. The process may involve CDI leadership, coding leadership, a physician advisor, department leadership, or other designated personnel, depending on organizational policy.

Neither CDI nor coding may independently supply the missing diagnosis because diagnostic conclusions remain the provider's responsibility. Removing an unresolved query simply to accelerate billing can undermine documentation integrity and may create compliance problems.

Escalation policies should be standardized rather than applied only when a particular diagnosis affects reimbursement. Policies commonly address expected response time, reminder intervals, responsible escalation personnel, high-priority queries, retrospective queries, and final-bill procedures.

The 2026 ACDIS/AHIMA Guidelines for Achieving a Compliant Query Practice supersede prior versions and serve as the current foundational guidance for organizations establishing compliant query policies and procedures.

A mature escalation process balances timely claim completion with respect for provider workload and independent clinical judgment. Its purpose is obtaining complete and accurate documentation, not forcing agreement with a CDI-generated diagnosis.

CCDS Reference Topics: Query escalation; organizational policy; unanswered queries; compliance; provider responsibility.

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The CDI specialist should accept the physician's clinically supported response. Querying is intended to clarify documentation, not to obtain a predetermined diagnosis or reimbursement result.

A compliant query should preserve the provider's independent clinical judgment. The physician may select one of the offered choices, document another diagnosis, rule out the suspected condition, or state that the diagnosis cannot be determined.

The fact that a different answer would qualify as an MCC is irrelevant to whether the provider's response should be respected.

Repeatedly issuing the same query because the initial response does not increase reimbursement risks creating a coercive or leading process and undermines documentation integrity.

A follow-up query could be justified if materially new clinical information appears or if the response itself remains internally contradictory or incomplete. But disagreement with the financial consequence is not sufficient.

The August 2026 ACDIS/AHIMA guidelines supersede all previous versions and are the current foundational resource for compliant query processes across healthcare settings.

CCDS Reference Topics: Provider autonomy; query response; MCC neutrality; ethical CDI practice; compliant querying.

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A condition can be assigned present-on-admission status even when the definitive diagnosis is not made until later in the hospitalization. POA refers to whether the condition was present at the time the order for inpatient admission occurred, not the calendar date on which diagnostic confirmation became available.

This distinction is particularly relevant for infections, malignancies, fractures, acute vascular events, and other conditions whose definitive identification may require cultures, pathology, imaging, or additional diagnostic testing.

Therefore, a blood culture finalized on hospital day 3 does not automatically make the infection hospital acquired. The clinical record and provider documentation must establish whether the disease process was present at admission.

POA assignment applies to applicable principal and secondary diagnoses, not only the principal diagnosis. CDI specialists should recognize unclear timing as a potential clarification opportunity because POA status can affect CMS Hospital-Acquired Condition payment logic and quality reporting.

The CCDS content outline expressly includes the basics of POA assignment and its impact on payment, as well as identification of CMS HACs.

CCDS Reference Topics: Present on admission; diagnosis timing; HACs; inpatient coding; quality reporting.

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The fracture occurred after inpatient admission as the result of a hospital fall, placing it within CMS's Hospital-Acquired Condition category for Falls and Trauma when the applicable fracture code is included in the HAC code list. CMS's FY 2026 MS-DRG Definitions Manual continues to identify qualifying fracture codes within HAC 05.

The fracture must still be coded; therefore, option D is incorrect. Because it clearly developed after admission, it would not appropriately receive POA indicator “U,” which indicates insufficient documentation to determine whether the condition was present on admission.

For qualifying HAC diagnoses that are not POA, CMS payment logic prevents the hospital from receiving the higher MS-DRG payment that would otherwise result solely from the condition's CC/MCC status. Thus, option B expresses the intended payment effect.

This distinction is central to CDI practice: a hospital-acquired diagnosis does not disappear from the record or coding. It remains reportable for clinical and quality purposes, but certain qualifying HACs are treated differently in MS-DRG payment calculations.

CCDS Reference Topics: HACs; POA indicators; Falls and Trauma; MS-DRG payment adjustment.

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The Hospital-Acquired Condition Reduction Program (HACRP) imposes a 1% reduction in applicable Medicare fee-for-service payments on subsection (d) hospitals ranking in the worst-performing quartile based on the Total HAC Score.

For the current program, CMS uses six measures: the CMS Patient Safety and Adverse Events Composite (PSI 90) and five healthcare-associated infection measures—CLABSI, CAUTI, specified surgical-site infection, MRSA bacteremia, and C. difficile infection.

HACRP must be distinguished from the separate DRA Hospital-Acquired Condition/Present-on-Admission payment provision. CMS explicitly states that these are different programs.

Hospital Value-Based Purchasing also links quality performance with hospital payment, but its structure is different: it is funded through a 2% reduction of participating hospitals' base operating DRG payments that is redistributed through value-based incentives.

For CDI professionals, accurate clinical documentation helps ensure that quality data appropriately represent the patient's condition and hospital course. CDI should not attempt to suppress valid complications or create unsupported comorbidities to change quality performance.

CCDS Reference Topics: HACRP; PSI 90; HAIs; quality reimbursement; CMS quality programs.

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The most critical missing element is the depth or level of tissue actually debrided. Documentation of an excisional debridement should identify whether tissue removed included skin, subcutaneous tissue, fascia, muscle, bone, or another anatomical layer. The level removed is fundamental to accurate procedural classification and coding.

CMS wound-care documentation standards similarly emphasize that the medical record should describe the type and depth of tissue removed. Merely knowing that an excisional debridement occurred does not establish the anatomical level of the procedure.

The instrument may provide useful procedural context—for example, scalpel, scissors, curette, or other technique—but the instrument alone does not identify the deepest tissue excised. Wound size can be important for clinical care and certain coding systems, but it does not replace documentation of the tissue level removed. The identity of the person performing the procedure is also part of procedural documentation but does not answer the principal coding-specific deficiency in this scenario.

A CDI query should therefore seek the deepest tissue level actually excised rather than infer it from the wound's overall depth.

CCDS Reference Topics: Medical record documentation; ICD-10-PCS/procedure documentation; debridement specificity.

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