Which statement correctly describes the Principal Diagnosis?

• A. It is the main reason for the admission.
• B. It is the last diagnosis listed.
• C. It is the main reason for the admission; other diagnoses are additional conditions that affect the encounter.
• D. It is used only for outpatient visits.

Answer: (C)

The principal diagnosis is the condition that chiefly prompted the patient’s admission after evaluation. It determines the primary reason for the hospital stay, while other diagnoses identified during the encounter are listed as additional conditions that affect the care provided. This means the main reason for admission and its related care drive the coding, with other comorbidities or complications recorded separately to reflect their impact on treatment and resource use. The statement that it is the main reason for admission and that other diagnoses are additional conditions that affect the encounter captures this relationship, which is why it’s the best choice. It isn’t about being the last diagnosis, and it isn’t limited to outpatient visits.