What prefix should be used when entering the policy and group number of the Medigap insured in Block 9 A?

In the context of completing Block 9 A on the CMS-1500 form for a Medigap insured, using any of the prefixes listed—MEDIGAP, MG, or MGAP—serves to clearly identify the nature of the coverage in relation to Medicare supplemental insurance.

The term "Medigap" refers to insurance policies that are designed to supplement original Medicare by covering some of the out-of-pocket costs not paid by Medicare, such as deductibles, copayments, and coinsurance. Prefixes like MEDIGAP indicate clearly that the insurance being reported relates to these specific types of policies, which is essential for proper processing and payment of claims.

Using any of these prefixes helps ensure that the claims are handled in the right context since they clearly categorize the insurance plan. It is important that providers use the correct designation for accurate claim processing by insurance carriers, and all three options serve that purpose effectively.