Medicare supplements provide private insurance coverage that helps fill the gaps in Medicare Parts A and B. Original Medicare pays for much, but not all, of the cost for covered health care services and supplies. Medicare Supplement Insurance (Medigap) policy can help pay some of the remaining health care costs, like deductibles copays and coinsurance. They don’t cover long-term care (like nursing home care), routine vision, dental or hearing care, hearing aids, eyeglasses, or private-duty nursing.
Medicare Part C plans are usually referred to as “Medicare Advantage” plans. All Medicare Advantage plans are run by private companies, and they all combine coverage for hospital stays with coverage for doctor visits. You can choose a plan that includes prescription drug coverage, often at no additional premium, or you can choose a plan without prescription drug coverage.
Medicare Part D is a separate insurance policy from called a prescription drug plan (PDP) that helps pay for your prescription drugs. You can buy from private insurance companies, or some types of Medicare Advantage plans that include drug coverage.