What is the purpose of Block 31 on the CMS-1500 form?

• A. To verify the claim is correct with the physician's or supplier's signature.
• B. To indicate the patient's consent for treatment.
• C. To list the billing method.
• D. To record the payment status.

Answer: (A)

Block 31 is the physician’s or supplier’s signature field. It exists to certify that the services billed were actually provided and that the information on the claim is true and complete to the best of the provider’s knowledge. This signature acts as the provider’s attestation and authorization to submit the claim for payment. It’s not about patient consent or payment status; those things are documented elsewhere. In short, the provider’s signature in this block confirms the claim’s accuracy and accountability for the billed services.