CDIP DRG Optimization and Case Mix Index

Question 1

What is the Case Mix Index (CMI) and why is it significant to a CDI program?

Accepted Answer

A numeric value reflecting the average relative weight of all MS-DRGs billed by a hospital, indicating resource use and complexity

Answer

CMI is calculated by averaging the relative weights of all MS-DRGs assigned during a period; a higher CMI reflects a more complex patient population and directly impacts Medicare reimbursement and quality benchmarks.

Question 2

Under the MS-DRG system, which of the following MOST directly increases a DRG's relative weight and associated reimbursement?

Accepted Answer

Documenting and coding a complication or comorbidity (CC) or major complication or comorbidity (MCC)

Answer

CCs and MCCs are secondary diagnoses that, when documented and coded, move a case from a base DRG to a higher-weighted DRG, resulting in greater reimbursement to reflect the increased resource use.

Question 3

A CDI specialist is reviewing a record where the principal diagnosis is listed as 'chest pain.' The physician also documented acute NSTEMI confirmed by troponin elevation. What CDI action is MOST appropriate?

Accepted Answer

Query the physician to clarify whether the NSTEMI should be the principal diagnosis

Answer

Per UHDDS guidelines, the principal diagnosis is the condition established after study to be chiefly responsible for the admission; the confirmed NSTEMI likely meets this definition and warrants a query for clarification.

Question 4

Which of the following secondary diagnoses would qualify as a Major Complication or Comorbidity (MCC) under the MS-DRG system?

Accepted Answer

Acute respiratory failure

Answer

Acute respiratory failure is classified as an MCC because it significantly increases the resources needed to treat the patient compared to the principal condition alone, reflecting its high severity.

Question 5

A hospital's CMI drops significantly over two quarters. After ruling out a change in patient population, which CDI-related factor is MOST likely contributing?

Accepted Answer

Underreporting of CC/MCC diagnoses due to documentation gaps

Answer

A CMI decline without a population shift typically indicates that CC/MCC conditions are not being documented and coded, resulting in cases falling into lower-weighted base DRGs.

(CDIP) Certified Documentation Improvement Practitioner Practice Test

(CDIP) Certified Documentation Improvement Practitioner Practice Test

CDIP DRG Optimization and Case Mix Index