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Medigap Plan M is a Medicare Supplement Insurance plan that covers certain out-of-pocket expenses for Medicare members, including copays, coinsurance and deductibles. It’s nearly identical to Medigap Plan D, but while Plan D covers the full Medicare Part A deductible, Plan M covers only half.
How it works
When Medicare pays for services, you’re responsible for certain out-of-pocket costs unless you have Medicare Supplement Insurance, or Medigap, to help cover them. Medigap plans are only for Original Medicare members — Medicare Advantage members can't buy a Medigap plan.
There are 10 standardized Medigap plans available in most states (except Massachusetts, Minnesota and Wisconsin, which use different standards). The plans differ in terms of coverage for services, out-of-pocket limits and premium costs.
Medigap Plan M pays for the full cost of most of the services it covers, but it covers only half of the Medicare Part A deductible. That deductible is $1,736 in 2026, so under Plan M, you would be responsible for $868.
Compare Medigap plans
| Insurance company | NerdWallet rating | Plan types offered | NAIC complaint rate | Premium discounts available |
|---|---|---|---|---|
| A, C, D, F, G and N | Far fewer than expected | Below average | ||
| A, B, C, F, G, K, L and N | Far fewer than expected | Above average | ||
| A, F, G and N | Far more than expected | Above average | ||
| A, F, G and N | Far fewer than expected | Above average |
What Medigap Plan M covers
Here’s what Medigap Plan M covers, according to Medicare.gov:
- Part A coinsurance and hospital costs up to an additional 365 days after Medicare benefits are used up.
- Part A deductible (50%).
- Part A hospice care coinsurance or copayment.
- Part B coinsurance or copayment.
- Skilled nursing facility care coinsurance.
- Blood transfusion (first three pints).
- Medically necessary emergency health care services for the first 60 days when traveling outside the U.S. Deductible and limitations apply.
What Medigap Plan M doesn’t cover
Medigap Plan M doesn’t cover one benefit that’s included in some other plans available to new Medicare members: Medicare Part B excess charges (if a provider is permitted to charge more than Medicare’s approved amount and does so).
Additionally, all Medigap plans, including Plan M, sold to new Medicare members don’t cover the following:
- Part B deductible (since 2020, new Medicare members can’t buy any plan that covers the Part B deductible, although existing members may own older plans that do).
- Prescription drugs (that's Medicare Part D).
- Long-term care (like non-skilled care you get in a nursing home).
- Private-duty nursing.
Shopping for Medigap plans? We have you covered.
| MEDICARE SUPPLEMENT, or Medigap, is private health insurance that covers “gaps” in traditional Medicare coverage. Compare options from our Medigap roundup. | |
| Best overall | Best for plan availability |
| Best for low prices | Best for premium discounts |
How much does Medigap Plan M cost?
Medigap plans are standardized and regulated by the government but sold by private companies. Those companies set premiums according to factors including age, location and tobacco use.
In Atlanta, a metro area with average costs for Medigap policies, monthly Medigap Plan M premiums for a 65-year-old female nonsmoker start at $94 per month, before any discounts.
🤓 Nerdy Tip
The cheapest Medigap Plan M policy has the same standardized Medicare coverage as the most expensive one. Companies may add on extra perks like discounted gym memberships, but the core Medicare benefits are the same, so go ahead and compare based on price. Your Medigap open enrollment period is the easiest and least expensive time to enroll in a Medigap plan.
This period happens only once. It starts once you’re 65 and enrolled in Medicare Part B, and lasts for six months. (If you're still working after 65 and covered by a group employer plan that is deemed creditable coverage, your six-month period starts after you’ve ended active employment or no longer have that insurance.)
Medigap policies are cheapest and easiest to get during this open enrollment period because insurance companies aren’t allowed to factor your health or medical history into your price. After the period ends, the prices may go up or you may be denied coverage due to your health status or medical history.
In some states, insurance companies sell Medigap plans to those under 65 who are living with a disability and are eligible for Medicare. You can find more information through your State Health Insurance Assistance Program, or SHIP.
If you have additional questions about Medicare, visit Medicare.gov or call 800-MEDICARE (800-633-4227, TTY 877-486-2048).
Compare alternative plans
| Get details on Medicare Supplement plan options | |
| If you want... | Consider... |
| Basic benefits | |
| Basics plus some extras | |
| Highest coverage | |
| Lower premiums, but higher copays | |
| Lowest premiums — partial coverage | |
| No longer for sale to new Medicare members | |
