Medicare Supplement plans, also called Medigap, are designed to work with Original Medicare Parts A and B. Medigap policies help pay for some health care costs not covered by Original Medicare, such as deductibles, coinsurance and foreign travel emergency.

These plans are offered by private insurance companies and are available to people with Medicare Part A and B. People with Original Medicare and a Medicare supplement can choose any stand-alone Part D prescription plans to pay for their drugs. People who are enrolled in Medicare Advantage plans (Part C) are not eligible for a Medicare Supplement insurance policy.