Define Case Mix Index (CMI) and describe its role in CDI analytics.

• A. CMI is the total number of cases in a hospital per year.
• B. CMI is the average DRG weight of a patient population; higher CMI reflects sicker patient mix and greater resource use, influencing reimbursement and CDI targets.
• C. CMI is the average length of stay of patients, used to measure efficiency.
• D. CMI is the ratio of outpatient to inpatient visits.

Answer: (C)