When coding on the UB-04 form, the first listed diagnosis code is described as which?

When coding on the UB-04 form, the first listed diagnosis code is described as which?

• A. Patient's responsibility
• B. Principal diagnosis
• C. Primary diagnosis
• D. Main diagnosis

Answer: (A)

On a UB-04 hospital claim, the diagnosis code listed first is the principal diagnosis—the condition determined after study to be the reason for the admission. This primary condition drives the hospitalization and is used to determine the DRG and payment. Other diagnoses that appear later are secondary conditions that affect care but are not the main reason for admission. Although you may hear “primary diagnosis” in some contexts, the official UB-04 terminology is principal diagnosis. A patient’s responsibility relates to payment liability, not a medical diagnosis, and “main diagnosis” is not the standard term used on the UB-04 form.

On a UB-04 hospital claim, the diagnosis code listed first is the principal diagnosis—the condition determined after study to be the reason for the admission. This primary condition drives the hospitalization and is used to determine the DRG and payment. Other diagnoses that appear later are secondary conditions that affect care but are not the main reason for admission. Although you may hear “primary diagnosis” in some contexts, the official UB-04 terminology is principal diagnosis. A patient’s responsibility relates to payment liability, not a medical diagnosis, and “main diagnosis” is not the standard term used on the UB-04 form.