Medicare Supplement Insurance (Medigap)

Medicare Supplement Insurance, known as Medigap, consists of private insurance policies designed to “fill the gaps” in Original Medicare(Part A and B). Because Original Medicare generally pays for about 80% of covered medical expenses, Medigap plans help beneficiaries cover the remaining out-of-pocket costs, such as deductibles, coinsurance, and copayments.

Medigap Coverage

  • Out-of-pocket costs in Original Medicare (copayments, coinsurance, and deductibles)

Medigap and Original Medicare(Part A & B)

Medigap is specifically designed to work only with Original Medicare. It functions as secondary insurance to enhance a beneficiary’s primary federal coverage.

  • Prerequisite: A beneficiary must be enrolled in both Medicare Part A and Part B to purchase a Medigap policy.
  • Secondary Payer: When a beneficiary receives covered services, Original Medicare pays its share first. The Medigap policy then pays its share of the remaining costs according to the specific plan’s benefits.
  • Provider Access: Because Medigap supplements Original Medicare, beneficiaries can see any doctor or visit any hospital in the U.S. that accepts Medicare. No referrals are required to see specialists.
  • Monthly Premiums: Beneficiaries pay a monthly premium to a private insurance company for Medigap in addition to the standard monthly Part B premium ($202.90 in 2026) paid to the federal government.

    Important Restriction: Medigap cannot be used with Medicare Advantage (Part C). It is illegal for anyone to sell a Medigap policy to an individual enrolled in a Medicare Advantage plan unless they are switching back to Original Medicare.

How to Buy Medigap Plans

Medigap plans may be purchased using Medicare.gov’s online tool and contacting private insurers directly.
  1. Select a Plan Online: Go to Medicare.gov: Find a Medigap Policy and find various plans and their benefit level.
  2. Find Policies: Find policies in local areas.
  3. Apply Directly: Contact the private insurer online or by phone for an official quote.

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