Block 31 on the CMS-1500 form requires which of the following?

• A. The signature of the physician or supplier to verify that the claim is correct.
• B. The date of service.
• C. The patient's contact email.
• D. The insurance policy number.

Answer: (A)

Block 31 is where the physician or supplier signs to certify that the information on the claim is true and that the services were provided as billed. This attestation is the provider’s formal authorization that the claim is accurate, which payers require before processing. The signature links the claim to the provider’s responsibility for the submitted data. The date of service is recorded in other parts of the form, and items like a patient’s email or the policy number belong in other blocks, so Block 31 specifically serves as the provider’s certified approval of the claim.