The Medicare 100-Day Rule: Myth vs. Reality
Medicare's 100 days of skilled nursing coverage come with three conditions: a 3-day inpatient hospital stay first, a daily charge from day 21, and nothing after day 100.
Medicare does not simply cover 100 days in a nursing home. You need a qualifying 3-day inpatient hospital stay first. Days 1 to 20 are covered in full. Days 21 to 100 cost $217 a day in coinsurance in 2026. After day 100, Medicare pays nothing. Coverage can also end earlier if you no longer need skilled care.
How many days does Medicare cover in a nursing home? Most people say "100 days," as if it were a fixed benefit. Families then get a bill starting on day 21, which they did not expect until day 101.
| Days in a benefit period | Medicare pays | You pay (2026) |
|---|---|---|
| 1 to 20 | All covered costs | $0 |
| 21 to 100 | All but the coinsurance | $217 a day, up to $17,360 for all 80 days |
| 101 and later | Nothing | All costs |
Myth: Medicare automatically covers 100 days in a nursing home
Coverage is not automatic, and the 100 days are not all paid the same way. Two conditions have to be met first, and the days fall into two cost tiers.
Condition one: the 3-day hospital rule
You generally need to have been admitted to a hospital as an inpatient for at least 3 consecutive days, not counting the day of discharge, right before you enter the skilled nursing facility (SNF).
Time under "observation status" does not count, even if you spent several nights in a hospital bed. You can be in the hospital for three nights and still not have a qualifying stay. Ask the hospital staff each day: "Am I admitted as an inpatient, or am I under observation?" Hospitals have to give you a written notice, called the MOON, if you are under observation for more than 24 hours.
Without a qualifying inpatient stay, Original Medicare generally will not cover the SNF stay. Some Medicare Advantage plans waive the 3-day rule, so check with your plan.
Condition two: you need daily skilled care
Medicare covers the stay only while you need skilled nursing or therapy every day for a condition related to the hospital stay. When the facility decides you no longer need skilled care, coverage ends, whether that is day 30 or day 80. Most covered stays are much shorter than 100 days.
You do not have to be improving. Skilled care that maintains your condition or slows a decline can also qualify. If you get a notice that coverage is ending and you disagree, you can ask for a fast appeal before the last covered day.
Days 1-20 versus days 21-100
Days 1 through 20 have no coinsurance. From day 21, you pay $217 a day in 2026, through day 100. The bill starts on day 21.
A 45-day rehab stay, for example, has 25 coinsurance days. That comes to $5,425.
What happens after day 100
After day 100 in a benefit period, Original Medicare pays nothing more for the stay, whatever your medical need.
A benefit period ends only when you have gone 60 days in a row without inpatient hospital or skilled nursing care. If you go back into the hospital within those 60 days, your day count continues where it left off. A new 100 days starts only after the 60-day break and a new qualifying hospital stay.
How Medigap and other coverage help
- Medigap. Most plans, including Plans G and N, pay the day 21 to 100 coinsurance in full. Plans A and B do not cover it, and Plans K and L pay part.
- Medicare Advantage. Each plan sets its own SNF copays, which may start earlier or later than day 21. Look at the skilled nursing section of your Evidence of Coverage.
- Medicaid. If you have both Medicare and Medicaid, Medicaid may pay the coinsurance. For a stay that becomes long-term, Medicaid is the program that pays. Check with our long-term care Medicaid estimator.
Without any of these, the full 80 coinsurance days cost $17,360. Estimate your own stay with the skilled nursing facility coverage calculator.
Frequently Asked Questions
Does Medicare really cover 100 days in a nursing home?
Not in full. Medicare covers up to 100 days per benefit period, and only the first 20 are free. Days 21 to 100 have a coinsurance of $217 a day in 2026, and coverage stops after day 100. Coverage also ends sooner if you no longer need daily skilled care.
What is the 3-day rule for Medicare skilled nursing facility coverage?
You generally need an inpatient hospital admission of at least 3 consecutive days right before the skilled nursing facility stay, or Original Medicare will not cover it. Time under observation status does not count.
What is the Medicare SNF coinsurance for 2026?
$217 per day for days 21 through 100 of a benefit period in 2026, up from $209.50 in 2025.
Does Medigap cover the skilled nursing facility coinsurance?
Most Medigap plans, including Plans G and N, pay the coinsurance for days 21 to 100 in full. Plans A and B do not cover it, and Plans K and L pay part of it.
This article is for general educational purposes and reflects 2026 CMS figures as of October 2026. It is not medical or financial advice. Confirm your coverage with Medicare or your plan.