Medicare is the Federal health insurance program for people who are 65 or older and certain younger people with disabilities or End-Stage Renal Disease. If you are enrolled in Medicare as well as COBRA continuation coverage, there may be special coordination of benefits rules that determine which coverage is the primary payer of benefits. Check your Summary Plan Description to see if special rules apply or ask your plan administrator. For more information on Medicare, visit Medicare.gov or call 1-800-MEDICARE.