Medicare skilled nursing coverage is one of the most misunderstood parts of Original Medicare. Many families assume Medicare pays for 100 days in a nursing facility after any hospital stay. That is not how it works. Medicare Part A covers up to 100 days of skilled nursing facility (SNF) care per benefit period.
However, only the first 20 days are fully covered. Strict rules also decide whether you qualify at all. A hospital stay that is too short, or billed the wrong way, can leave you with the entire bill. Knowing how medicare skilled nursing coverage works before a hospital discharge can save your family serious stress and money.
How Medicare Skilled Nursing Coverage Works Under the 100-Day Rule
The “100-day rule” refers to the maximum number of SNF days Medicare Part A will help pay for in one benefit period. It is a ceiling, not a guarantee. Medicare pays only as long as you need daily skilled care and keep making use of it. Many people get fewer than 100 days. In fact, coverage often ends after a few weeks once therapy goals are met or care becomes custodial.
Costs change as the stay goes on. Under Original Medicare, the 100 days split into three phases:
| Days in the SNF | What You Pay (Original Medicare) |
|---|---|
| Days 1–20 | Nothing. Medicare pays the full approved amount. |
| Days 21–100 | A daily coinsurance amount set each year by CMS |
| Day 101 and beyond | All costs. Medicare pays nothing. |
The daily coinsurance for days 21 through 100 adds up fast. A full 80-day stretch can cost many thousands of dollars. CMS updates the figure every year, and Medicare.gov lists the current amount. As a result, the second phase of a SNF stay is where most families feel the financial impact.
Covered SNF services include a semi-private room, meals, and skilled nursing care. They also include physical, occupational, and speech-language therapy. Medications, medical supplies, and ambulance transport when medically necessary are included too. A private room is typically not covered unless it is medically required.
Who Qualifies: The Rules Behind the 100 Days
Before any days count, you must meet several conditions. Missing even one can block coverage completely. Here are the core requirements under Original Medicare:
- Part A coverage: You must have Medicare Part A with days left in your benefit period.
- Qualifying hospital stay: You need a medically necessary inpatient hospital stay of at least 3 consecutive days.
- Timely admission: You typically must enter a Medicare-certified SNF within 30 days of leaving the hospital.
- Daily skilled need: A doctor must certify you need skilled nursing or therapy on a daily basis.
- Related condition: The SNF care must treat a condition tied to your hospital stay, or one that started while you were in the SNF.
The 3-day rule trips up many families. Days count only when you are formally admitted as an inpatient. The day of discharge does not count. Time spent under “observation status” also does not count, even if you slept in a hospital bed for several nights. Hospitals must give you a Medicare Outpatient Observation Notice (MOON) if you are under observation for more than 24 hours. Always ask staff directly: “Am I an inpatient or under observation?”
The benefit period matters too. A benefit period starts the day you are admitted as an inpatient. It ends once you have gone 60 days in a row without inpatient hospital or SNF care. After that, a new benefit period begins, and a fresh 100 SNF days become available. There is no lifetime limit on the number of benefit periods. However, you need a new qualifying 3-day stay to start SNF coverage again.
Another key point involves “improvement.” Under the 2013 Jimmo v. Sebelius settlement, Medicare cannot deny skilled care only because a patient is not improving. Skilled care to maintain your condition or slow decline can still be covered. Facilities sometimes cite a “plateau” to end coverage. That reason alone is not a valid basis for denial.
Protecting Your Medicare Skilled Nursing Coverage: Next Steps
The best protection starts before discharge. Confirm your inpatient status early and in writing. If you are under observation, ask your doctor whether inpatient admission is medically justified. Some beneficiaries who were switched from inpatient to observation now have appeal rights. These rights came from the 2023 Alexander v. Becerra court decision, and CMS has been building out that appeals process.
Next, consider how your plan affects medicare skilled nursing coverage. Medicare Advantage plans from companies like UnitedHealthcare, Humana, Aetna, and Blue Cross follow different rules. Many waive the 3-day hospital stay requirement. However, most require prior authorization before admission. They also set their own copays, which may start earlier than day 21. Prior authorization denials for SNF care have drawn scrutiny from the HHS Office of Inspector General. If your plan denies a stay, you can appeal.
Medigap can fill the coinsurance gap under Original Medicare. Plans C, D, F, G, M, and N cover 100% of the SNF coinsurance for days 21 through 100. Plan K covers 50%, and Plan L covers 75%. Plans A and B do not cover it. Carriers such as Mutual of Omaha, Cigna, and AARP/UnitedHealthcare offer these standardized plans. Premiums vary by state, age, and carrier. Note that no Medigap plan pays past day 100.
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Finally, know your appeal rights when coverage ends. The SNF must give you a Notice of Medicare Non-Coverage (NOMNC) at least 2 days before covered services stop. You can request a fast appeal through your Beneficiary and Family Centered Care Quality Improvement Organization (BFCC-QIO). The contact information is printed on the notice. Call by noon of the day before services end. For example, if coverage ends Friday, call no later than noon Thursday. You typically will not pay for care during the review.
Plan for day 101 as well. After 100 days, long-term custodial care is not covered by Medicare. Options include long-term care insurance, personal savings, or Medicaid. Each state runs its own Medicaid nursing home program with income and asset limits. Your State Health Insurance Assistance Program (SHIP) offers free, unbiased counseling on all of these choices. You can find your local SHIP at shiphelp.org.
Frequently Asked Questions
Does Medicare pay for 100 days in a nursing home?
Not automatically. Medicare skilled nursing coverage pays in full for only the first 20 days. Days 21 through 100 require a daily coinsurance. In most cases, coverage ends sooner because skilled care is no longer needed.
Do observation days count toward the 3-day hospital stay?
No. Only days as a formally admitted inpatient count. Observation days, emergency room time, and the discharge day are excluded. As a result, always confirm your status with the hospital before discharge.
Can my 100 SNF days reset?
Yes. Your medicare skilled nursing coverage resets when a new benefit period begins. That happens after 60 consecutive days without inpatient or SNF care. You will typically need a new 3-day inpatient stay to qualify again.
What happens if I still need care after day 100?
Medicare stops paying on day 101. You become responsible for all costs. Many families turn to Medicaid, long-term care insurance, or private funds. A local SHIP counselor can help you compare options at no cost.
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Official Sources & Resources
For verified information on Medicare regulations and consumer protection:
- Medicare.gov (Official Site): medicare.gov
- CMS (Centers for Medicare & Medicaid Services): cms.gov
- NAIC (National Association of Insurance Commissioners): naic.org
- KFF Medicare Research: kff.org/medicare
- Social Security Administration: ssa.gov
Content last reviewed October 2026. If you notice any outdated information, please contact us.