What is a Medicare Supplement plan and does my loved one need one?

What is a Medicare Supplement plan and does my loved one need one? - Meet DANNY

A Medicare Supplement plan (also called Medigap) is private insurance that pays some or all of the out-of-pocket costs that original Medicare doesn’t cover — including deductibles, copays, and coinsurance. For anyone with serious illness or complex care needs, a comprehensive Medigap plan dramatically reduces financial uncertainty. Plans are standardized by letter (A through N), so Plan G from one insurer is identical in coverage to Plan G from another — you’re shopping on price and customer service.

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What Medigap covers

Coverage varies by plan letter. The most popular plans for comprehensive coverage:

  • Plan G (most popular for new enrollees): Covers everything except the Part B deductible ($240 in 2025). After that deductible is met, you pay essentially nothing for Medicare-covered services.
  • Plan N: Covers most gaps but requires small copays ($20 for office visits, $50 for emergency room). Lower premium than Plan G.
  • Plan F: The most comprehensive — covers everything including the Part B deductible. Only available to people who were eligible for Medicare before January 1, 2020.

What Medigap does not cover

  • Prescription drugs (need a separate Part D plan)
  • Vision, dental, or hearing
  • Long-term care
  • Care outside the U.S. (some plans cover emergency care abroad)

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When to buy Medigap (timing matters enormously)

The best time to buy Medigap is during your loved one’s open enrollment period — the six months starting the month they turn 65 and are enrolled in Part B. During open enrollment, insurers cannot deny coverage or charge more due to pre-existing conditions. After open enrollment, insurers in most states can medically underwrite — meaning they can reject your loved one or charge significantly higher premiums based on health status. If your loved one is already seriously ill, they may not be able to get Medigap at any price in many states.

Medigap vs Medicare Advantage

Medigap works with original Medicare — you keep full provider choice with no network restrictions. Medicare Advantage replaces original Medicare with a private plan that has networks and often requires prior authorization. For people with complex, ongoing care needs who see multiple specialists or may need significant skilled nursing or home health care, Medigap typically provides more predictable costs and broader access.

Frequently asked questions

How much does a Medicare Supplement plan cost?

Medigap premiums vary by plan type, age, gender, tobacco use, and location. Plan G premiums in 2025 typically range from $100 to $300 per month for a 65-year-old. Premiums increase with age. Compare multiple insurers — coverage is identical, so premium and customer service are the only differentiators.

Can I be denied a Medicare Supplement plan?

During your open enrollment period (first 6 months after turning 65 and enrolling in Part B), you cannot be denied. After that, most states allow medical underwriting, meaning insurers can deny coverage or charge more based on health history. Some states have continuous open enrollment protections — check your state’s rules.

Do I need both a Medicare Supplement plan and a Part D drug plan?

Yes — Medigap plans do not cover prescription drugs. You will need a separate Medicare Part D plan for drug coverage. When comparing total Medicare costs, factor in both the Medigap premium and the Part D premium.

What is the most comprehensive Medicare Supplement plan?

Plan F is the most comprehensive, covering all Medicare cost-sharing including the Part B deductible. However, Plan F is only available to people eligible for Medicare before January 1, 2020. For most new enrollees, Plan G is the most comprehensive available option.

Can I have a Medicare Supplement plan and a Medicare Advantage plan at the same time?

No — Medigap works with original Medicare only. You cannot use a Medigap plan if you are enrolled in Medicare Advantage. If you want to switch from Advantage to original Medicare with a Medigap plan, do so during an enrollment period and be aware of potential medical underwriting.