Medicare Supplement Eligibility You can buy a Supplement policy only if you already have Medicare Part A and Part B A state resident of where the plan is offered Age 65 or older In some states, under 65 with a disability or end stage renal disease. Do You Need a Licensed Health Agent? Click Here to Find Out More.. Medigap ... Medicare Supplement Enrollment Medicare Supplement Coverage What is a Medicare Supplement Plan Medicare Supplement Costs (Medigap) Medicare Advantage vs Medicare Supplement Plans Eligibility... Part A Eligibility Medicare Part B Eligibility Medicare Advantage Eligibility (Part C) Medicare Part D Eligibility Eligibility for…