A Medigap policy provides a Medicare beneficiary supplemental insurance through a private insurance company. The policy provides coverage to help pay some of the costs that Original Medicare doesn't cover like copayments and coinsurance. Medigap policies only work with Original Medicare.
Medicare Advantage Plans (like an HMO or PPO) also called “Part C” are health plans run by Medicare-approved private insurance companies. Medicare Advantage Plans include Part A, Part B, and usually other coverage like Medicare prescription drug coverage (Part D), sometimes for an extra cost.
Medicare Part D
These plans (sometimes called “PDPs”) add drug coverage to Original Medicare, some Medicare Cost Plans, some Medicare Private Fee-for-Service (PFFS) plans, and Medicare Medical Savings Account (MSA) plans.
*Medicare product information can be found at www.medicare.gov.