Medicare Supplement Insurance
A Medigap policy is health insurance sold by private insurance companies to fill the "gaps" in Original Medicare Plan coverage. Medigap policies help pay some of the health care costs that the Original Medicare Plan doesn't cover. If you are in the Original Medicare Plan and have a Medigap policy, then Medicare and your Medigap policy will pay both their shares of covered health care costs.
Insurance companies can only sell you a "standardized" Medigap policy. These Medigap policies must all have specific benefits so you can compare them easily. You may be able to choose up to 12 different standardized Medigap policies (Medigap Plans A through L). Medigap policies must follow Federal and State laws. These laws protect you. A Medigap policy must be clearly identified on the cover as "Medicare Supplement Insurance." Each plan, A through L, has a different set of basic and extra benefits.