Which of the following statements is true about the relationship between diagnoses and service lines on UB-04?

• A. Diagnoses are always listed only in the header and not linked to lines.
• B. Diagnoses are encoded by revenue codes alone.
• C. Diagnoses are linked to service lines via diagnosis pointers to reflect which lines are affected.
• D. The UB-04 does not support linking diagnoses to service lines.

Answer: (C)

Understanding how diagnoses relate to service lines on UB-04 hinges on diagnosis pointers. Each service line identified by a revenue code can have one or more diagnosis pointers that reference the corresponding diagnosis codes (ICD-10-CM). This setup shows exactly which diagnoses pertain to which service-line items, so the claim captures the relationship between the patient’s conditions and the services billed for those conditions. The principal diagnosis may appear in the header, but the full linkage across all lines is achieved through the diagnosis pointers. Revenue codes classify the type of service, while ICD-10-CM codes describe the conditions, and the pointers tie the two together. The UB-04 does support this linkage, so stating that it does not would be incorrect.