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Does Medigap Help With Skilled Nursing Copays? How to Check

ByNHP Specialist Care Team

A family may know that Medicare covers skilled nursing rehabilitation but be surprised when daily coinsurance begins later in the stay.

If the person has Original Medicare plus a Medigap policy, that supplement may cover some or all of the skilled nursing facility coinsurance.

But the answer depends on the exact Medigap plan.

Medigap helps with cost sharing for Medicare-covered skilled nursing care. It does not turn custodial long-term nursing-home care into a Medicare-covered benefit, and it does not extend the 100-day SNF benefit limit.

Start with the 2026 Original Medicare SNF costs

For a qualifying Original Medicare Part A skilled nursing facility stay in 2026:

  • Days 1–20: $0 daily SNF coinsurance.
  • Days 21–100: $217 daily coinsurance.
  • Day 101 and beyond: the beneficiary pays all costs.

Coverage applies only while Medicare’s skilled-care requirements continue to be met.

The phrase “100 days” is a maximum within a benefit period, not a guaranteed 100-day rehab stay.

Find the exact Medigap plan letter

In most states, Medigap policies are standardized and identified by letters.

Do not ask only, “Does Dad have Medicare supplement insurance?”

Find the card or policy and identify whether it is Plan:

  • A;
  • B;
  • C;
  • D;
  • F;
  • G;
  • K;
  • L;
  • M; or
  • N.

Massachusetts, Minnesota, and Wisconsin standardize Medigap differently, so families in those states should use their state-specific plan information.

Which standardized plans cover SNF coinsurance?

Medicare’s 2026 Medigap comparison chart shows:

100% of the Medicare SNF coinsurance

  • Plan C
  • Plan D
  • Plan F
  • Plan G
  • Plan M
  • Plan N

Partial SNF coinsurance

  • Plan K: 50%
  • Plan L: 75%

No standardized SNF coinsurance benefit

  • Plan A
  • Plan B

The policy must still be in force, and the underlying SNF service must be Medicare-covered.

Plan C and Plan F have an eligibility limitation

People who were newly eligible for Medicare on or after January 1, 2020 generally cannot buy Medigap Plan C or Plan F.

Some people who became eligible before that date may still have or be able to buy those plans, depending on their rights and market availability.

Do not tell a family to switch into Plan F just because it covers SNF coinsurance.

High-deductible Plan F or G works differently

High-deductible versions of Plans F and G may be offered in some states.

Medicare lists a $2,950 high-deductible amount in 2026.

With a high-deductible version, the beneficiary pays Medicare-covered costs until the applicable deductible is met before the Medigap policy begins paying covered benefits.

So “Plan G covers SNF coinsurance” is not enough information.

Ask whether the policy is the standard or high-deductible version.

Medigap does not work with Medicare Advantage

Medigap is designed to supplement Original Medicare.

A person enrolled in Medicare Advantage cannot use a Medigap policy to pay Medicare Advantage copays or coinsurance.

If the person has Medicare Advantage, review that plan’s SNF cost-sharing schedule instead.

Our article Medicare Advantage vs Original Medicare for Rehab explains the broader differences.

Medigap only helps when Original Medicare is covering the SNF stay

This is one of the most important limitations.

If Original Medicare decides that the person no longer needs covered skilled nursing or therapy, the Medigap SNF coinsurance benefit generally does not transform the stay into covered long-term care.

Medicare explains that Medigap generally does not cover long-term custodial care.

That means the family should track two questions separately:

  1. Does Original Medicare still cover the skilled stay?
  2. If yes, how much of Medicare’s coinsurance does the Medigap plan pay?

Day 101 is not a Medigap extension

Original Medicare’s SNF benefit ends after day 100 in a benefit period even if the person still needs facility care.

A standardized Medigap policy’s SNF coinsurance benefit does not create another block of Medicare SNF days.

If the resident remains after Medicare coverage ends, the payer may shift to:

  • private pay;
  • Medicaid, if eligible;
  • long-term-care insurance;
  • another benefit; or
  • another arrangement.

Our guide What Happens When Medicare Stops Paying for Rehab? explains the transition questions.

Ask whether a new benefit period has begun

Original Medicare measures hospital and SNF coverage using benefit periods.

A benefit period ends after the person has not received inpatient hospital care or skilled SNF care for 60 days in a row.

A new benefit period can reset the SNF day count if all coverage requirements are met again.

Do not assume a calendar-year reset creates a new 100 days.

Verify the Medigap policy before the coinsurance starts

Before day 21, call the insurer using the number on the Medigap card.

Ask:

  • Is the policy active?
  • What plan letter is it?
  • Is it a high-deductible policy?
  • Does it cover SNF coinsurance?
  • At what percentage?
  • Does the beneficiary have to meet any deductible first?
  • Does the SNF bill the supplement directly?
  • Is any coordination paperwork missing?

Also give the SNF billing office the correct Medigap information.

Check whether the facility is billing the correct payer order

The billing sequence can involve:

  • Original Medicare;
  • Medigap;
  • employer or retiree coverage;
  • Medicaid; or
  • other insurance.

A claim can look like a family debt when secondary insurance has not yet processed.

Ask for an itemized account before paying a large unexpected balance.

A practical example

Suppose Robert has a Medicare-covered SNF stay after surgery.

He reaches day 21, when Original Medicare’s 2026 daily coinsurance becomes $217.

Robert has standard Medigap Plan G.

Medicare’s standardized plan chart shows Plan G covers 100% of the SNF coinsurance benefit, assuming the stay remains Medicare-covered and the policy is active.

Now suppose another resident has Plan K.

Plan K covers 50% of that standardized SNF coinsurance benefit, so the family may still owe part of the daily amount until other applicable plan provisions are considered.

The plan letter matters.

Five questions to ask before paying the SNF coinsurance bill

  1. Is Original Medicare still covering the skilled stay?
  2. What exact Medigap plan and version does the resident have?
  3. What percentage of SNF coinsurance does that plan cover?
  4. Has the SNF submitted the claim to the supplement correctly?
  5. Is the amount being billed true Medicare coinsurance, or is it a charge after Medicare coverage ended?

That last distinction can change the answer completely.

Sources and review date

Sources checked October 11, 2026. Medigap availability and pricing vary, and Massachusetts, Minnesota, and Wisconsin use different standardization systems.

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