What is the difference between a Diagnosis Code and a Procedure Code on the UB-04?

• A. Diagnosis codes describe conditions; procedure codes describe treatments or services performed.
• B. Diagnosis codes describe patient demographics.
• C. Procedure codes describe insurance plan.
• D. Diagnosis codes identify the hospital.

Answer: (A)

On the UB-04, diagnosis codes tell you what conditions the patient has or the reason for the encounter, while procedure codes describe the actual care that was performed. Diagnosis codes (often ICD-10-CM) justify why care was needed and indicate the medical problems being treated. Procedure codes (such as ICD-10-PCS for inpatient procedures, with HCPCS used for certain services) specify the exact actions taken—surgeries, tests, treatments, or other services.

For example, if someone is admitted with acute appendicitis, the diagnosis code records the condition. The procedure code records the actual surgery performed, like a laparoscopic appendectomy. If a fracture is treated with X-rays and a cast, the diagnosis code identifies the fracture, while the procedure codes describe the imaging and immobilization steps.

Other options don’t fit because demographics aren’t described by diagnosis or procedure codes, and insurance plan details or hospital identity aren’t conveyed by these codes.