Exactprep CCDS Questions

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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