A listing of patients seen in a hospital, both inpatient and outpatient, with ICD-9-CM diagnosis codes is called the

• A. Disease Index
• B. Registry File
• C. Patient Census
• D. Case List

Answer: (A)

In hospital information management, a disease index is a listing of all patients seen in the facility—both inpatients and outpatients—organized by their ICD-9-CM diagnosis codes. This arrangement lets clinicians and staff retrieve every patient with a given condition, analyze disease frequency, and generate reports or research data efficiently. It’s specifically designed to group records by diagnosis, unlike a patient census which simply counts current patients regardless of diagnosis, a registry file which collects data for a particular condition over time, or a case list which targets a defined set of cases for a specific purpose rather than as a comprehensive by-diagnosis catalog. This is why the disease index is the best fit for the described listing.