Which factor is NOT considered in DRG determination?

• A. Admitting diagnosis
• B. Immunization status
• C. Severity of Condition
• D. Comorbidities

Answer: (B)

DRGs group hospital stays by expected resource use, so the main drivers are the patient's clinical presentation and the therapies needed during the stay. The base DRG is anchored to the principal (admitting) diagnosis, and the level of severity plus any comorbidities or complications (often captured as CCs or MCCs) adjust the weight to reflect greater resource use. Immunization status, on the other hand, is preventive care and does not alter the medical complexity, procedures required, or the resources a particular inpatient stay will consume, so it does not influence DRG assignment. Therefore, immunization status is not considered in DRG determination, while admitting diagnosis, severity of condition, and comorbidities are.