Share of Cost, Understand how the Marketplace Affects Your Medicare Coverage.
If you are eligible for Medicare, you should not use the Marketplace to get health and drug coverage, with two exceptions. If you are eligible for Medicare because you have End-Stage Renal Disease (kidney disease that requires dialysis or transplant) or you have to pay a premium for Medicare Part A (hospital insurance), you can choose to enroll in a Marketplace plan instead of Medicare.
You do not buy a Medicare Advantage Plan, Part D prescription drug plan, or Medicare supplemental insurance (known as Medigap) through the Marketplace. It is illegal for someone to sell you a Marketplace plan if they know you are enrolled in Medicare. If someone tries to sell you a Marketplace plan, let them know that you have Medicare and cannot enroll in a Marketplace plan.