What does Block 1 of the CMS-1500 form indicate?

• A. The type of health insurance coverage applicable to the claim.
• B. The patient name.
• C. The service date.
• D. The diagnosis code.

Answer: (A)

Block 1 shows the payer category—the kind of health insurance coverage applying to the claim. This first piece of information lets the billing system know which set of rules, edits, and submission pathways to apply, since Medicare, Medicaid, private plans, workers’ compensation, and other programs all have different requirements. With the payer type identified, the claim can be routed and processed correctly before the rest of the form’s details—such as patient name, service date, and diagnosis code—are evaluated in their respective blocks.