The policyholder's commercial group number, if the patient is covered by a group health plan, is entered in which block of the CMS-1500?

The policyholder's commercial group number is entered in block 11 of the CMS-1500 form. This block is designated for information regarding the insured's policy or group number, which is essential for proper billing and claim processing.

Block 11 is specifically used to capture the details related to the payer’s identification, ensuring that the correct insurance company processes the claim related to that particular group health plan. By entering the commercial group number here, healthcare providers facilitate the accurate verification of the patient's coverage and minimize delays in reimbursement.

The other choices provided, while they refer to subdivisions and other components of block 11, do not represent the complete or correct designation for where the group number itself is recorded. This means that selecting only block 11 encompasses the necessary details for submission regarding the policyholder's commercial group number.