Medicare Supplement Insurance (Medigap) is extra insurance you can buy from a private insurance company to help pay your share of out-of-pocket costs in Original Medicare.

You can only buy Medigap if you have Original Medicare. Generally, that means you have to sign up for Medicare Part A (Hospital Insurance) and Part B (Medical Insurance) before you can buy a Medigap policy.

  • Part A (Hospital Insurance) covers inpatient hospital stays, skilled nursing facility care, hospice care, and some home health care.
  • Part B (Medical Insurance) covers certain doctors’ services, outpatient care, medical supplies, and preventive services.