The term "Medigap" refers to Medicare supplemental insurance. It is private health insurance designed specifically to supplement Medicare benefits by filling in some of the gaps in Medicare coverage.

For participating providers, when the Medigap information is provided, Medicare will automatically send the Medigap insurer a copy of Medicare's approved amount and payment for the billed services. This "one-step" billing eliminates the need for you to submit a separate bill to the beneficiary or their Medigap insurer.

Beginning October 1, 2007, the Centers for Medicare & Medicaid Services (CMS) transferred responsibility for the mandatory Medigap crossover process (also known as the "Medicare claim-based crossover process") to its Coordination of Benefits Contractor. With this change, Highmark Medicare Services will no longer maintain crossover relationships with Medigap insurers.

Please refer to CMS Coordination of Benefits (COB) for the newly assigned 5-byte COBA Medigap claim-based Identification numbers (range 55000 to 59999).

You can find the identification numbers on the CMS website. Click here to access them.  Note: You will be leaving our website and accessing a new website when you click this link.  The link should open in a new browser window.