Which CMS-1500 block indicates an ICD diagnosis code?

• A. Block 21
• B. Block 24D
• C. Block 33
• D. Block 32

Answer: (A)

The key concept is where to report ICD diagnosis codes on a CMS-1500 claim. ICD-10-CM diagnosis codes are entered in the block labeled Medical Information, the section of the form designated for diagnoses. This area collects the patient’s conditions that justify the services and ties them to the billed procedures.

Other blocks on the form handle different data, such as dates of service, CPT/HCPCS procedure codes, and provider or location information. Those sections do not contain the ICD diagnosis codes.