Medicare Skilled Nursing After a Hospital Stay: The 3-Day Rule

Original Medicare covers a stay in a skilled nursing facility (short-term rehab) only after your parent has been a hospital inpatient for at least 3 days in a row, counting the day they were admitted but not the day they leave. Time in the ER or under observation doesn't count. Your parent also has to enter the facility within about 30 days of leaving the hospital and need skilled nursing or therapy every day. Medicare Advantage plans can waive the 3 days, but a plan may want to approve the stay first.

If your parent is in the hospital right now, start with our guides to the first 48 hours of a parent's hospital stay and the hospital discharge checklist. This one picks up where rehab enters the conversation.

What has to be true for Medicare to pay

Medicare.gov's skilled nursing facility care page and its booklet Medicare Coverage of Skilled Nursing Facility Care list the conditions for Original Medicare. All of them have to be true.

For therapy alone, the booklet says "daily" means needed and given 5 to 7 days a week.

How to count the 3 days

CMS's Skilled Nursing Facility 3-Day Rule Billing fact sheet (May 2026) tells hospitals to count inpatient days midnight to midnight. The admission day counts as a full day, the discharge day doesn't, and time in the ER or under observation before the admission order doesn't count at all.

The bedside version: count the midnights your parent spent as an admitted inpatient. You need three.

The second row is a CMS example: a patient who accepts a facility admission after only 2 inpatient days pays out of pocket unless they have other coverage.

Two details that get missed:

• The 3 days can span more than one hospital. CMS says the rule is met by 3 consecutive days "in 1 or more hospitals," so a transfer doesn't reset the count.
• The hospital is supposed to tell you the number. The fact sheet says hospitals should clearly tell patients or their representatives, and the facility, how many inpatient days there have been, during the stay and before discharge. Ask for the count in days, not "you should be fine."

If the count comes up short

Observation the whole time. If your parent was never formally admitted, they're an outpatient, even after nights in a regular bed. Medicare.gov's inpatient or outpatient status page says admission is generally appropriate when someone is expected to need 2 or more midnights of medically necessary hospital care, but a doctor has to order it. Asking whether your parent meets inpatient criteria is fair.

Admitted, then switched to observation. Since February 14, 2025, Medicare.gov's page on appealing a change from inpatient to observation says someone in Original Medicare who was admitted and then changed to "outpatient getting observation services" can ask for a fast appeal. The hospital should give a Medicare Change of Status Notice (CMS-10868) before your parent leaves; if it doesn't, ask. The notice names your state's BFCC-QIO, the independent reviewer, which decides about 2 days after the appeal is filed. Appealing from the hospital bed is best, but your parent can still appeal after leaving. If the reviewer finds the change was wrong, a skilled nursing stay within 30 days of that discharge may be covered. These rights came from a class action, Alexander v. Azar. CMS's fact sheet on the final rule also set up a one-time look-back for older stays, with admissions going back to January 1, 2009. That filing window closed on January 2, 2026, per Medicare.gov's retrospective appeal page; a late request now has to show good cause for filing late.

A waiver applies. Medicare.gov says your parent may not need the 3 days if their doctor is in an Accountable Care Organization approved for a "Skilled Nursing Facility 3-Day Rule Waiver." CMS's billing fact sheet adds Innovation Center models, including ACO REACH and the Transforming Episode Accountability Model (TEAM). Your parent has to meet the model's criteria and go to an approved facility, and the list of models changes over time, so ask the case manager whether one applies.

None of that. Medicare.gov suggests asking about other settings, like home health, or whether Medicaid or veterans' benefits could help. An inpatient rehabilitation facility is a separate benefit with its own test: a provider certifies that your parent needs intensive rehab, close medical supervision and coordinated care, per Medicare.gov's inpatient rehabilitation page.

Medicare Advantage plays by its own rules

Medicare.gov says Medicare Advantage plans may waive the 3-day stay. The trade-off is approval. Medicare's skilled nursing booklet says that, depending on the plan, your parent:

• May need to tell the plan before being admitted, and may pay more, or all, of the stay if they don't. Plans usually call this prior authorization.
• May have to use a facility in the plan's network.
• May owe copayments during the first 20 days.

So for a Medicare Advantage member, the question is less "did we hit 3 midnights?" and more "has the plan approved this facility, in writing, and for how many days?" Keep the approval letter and reference number. If you're not sure which card is the plan's, our list of Medicare documents to keep for a parent sorts them out.

How the 100 days actually work

Original Medicare covers up to 100 days per benefit period, per Medicare.gov:

Some Medigap policies pay all or part of that daily coinsurance, so check the policy. The amounts change every year; our Medicare Open Enrollment checklist covers the yearly review.

What people get wrong:

1. It's "up to" 100 days. Coverage lasts only while your parent needs and gets daily skilled care. Many stays end well before day 100.
2. The benefit period resets after 60 days in a row with no inpatient hospital or skilled nursing care. The next qualifying stay starts a new benefit period, with a fresh 100 days and a new deductible.
3. A short break doesn't need a new hospital stay. Going back to the same or another facility within 30 days doesn't require another 3 days, but your parent uses whatever days remain. If the break in skilled care lasts more than 30 days, they need a new qualifying hospital stay.

The booklet also notes the facility doesn't have to tell your parent in writing when the benefit days run out. Keep your own count.

Choosing the facility

The hospital may hand you a list of open beds the afternoon before discharge. Check before you pick.

• Look them up on Care Compare. Pick "Nursing homes including rehab services" to see inspection results, staffing, quality measures and star ratings.
• Ask for the latest inspection report. Medicare's booklet says the facility must show it on request. If problems were cited, ask whether they've been corrected.
• Call the Long-Term Care Ombudsman and ask how many complaints a facility has had, what kind, and whether they were resolved.
• Tour, or send someone, with Medicare's one-page skilled nursing facility checklist: certification, a bed for the care your parent needs, staffing, a full-time social worker, and whether a doctor can be reached at all times.
• Ask about the bed-hold policy. If your parent goes back to the hospital, the bed isn't guaranteed, and holding it may cost something.

Then read the admission agreement before signing, looking for "responsible party" or "guarantor" language. CMS's admission, transfer and discharge review form tells state inspectors that a facility can't require a third party to guarantee payment for admission or a continued stay, and uses an adult child as the example. If you sign because you manage your parent's money, sign as their representative, not as someone promising to pay from your own pocket. If the wording is murky, ask the ombudsman.

Questions for the hospital case manager

Bring these when rehab first comes up, not on discharge morning.

• Is my parent an inpatient now? Since what date and time?
• How many inpatient days will they have by the planned discharge date?
• If they were switched to observation, where is the Change of Status Notice?
• Is their doctor or this hospital in a program with a 3-day waiver?
• For Medicare Advantage: has the plan approved a facility, which ones are in network, and for how many days?
• Which certified facilities have a bed for the care my parent needs?
• What skilled care is being ordered, and what's the goal (walking a set distance, stairs, wound healing)?
• Who sends the medication list and discharge summary to the facility?

If staff hesitate to discuss your parent with you, our guide to a HIPAA authorization for a parent explains what lets them share.

While your parent is in rehab

Medicare requires an initial assessment within the first 8 days, then a care plan. The booklet says your parent, the family or someone acting for them has the right to take part in planning that care, so tell the social worker you want to be invited to care plan meetings.

Skipping therapy can cost coverage. Medicare.gov says refusing daily skilled care or therapy may end skilled nursing coverage, though an illness like the flu can pause it temporarily. If your parent is refusing because of pain, fear or low mood, tell the nurse and doctor early.

"Not improving" alone isn't a reason to stop. Under the 2013 Jimmo v. Sebelius settlement, CMS confirmed that skilled nursing and therapy coverage turns on the need for skilled care, not on potential for improvement. Care to maintain a condition or slow decline can be covered. The Center for Medicare Advocacy, which brought the case, still hears of the "improvement standard" being applied. If someone says your parent has "plateaued," ask whether they still need a nurse's or therapist's skills to be safe, because that is what coverage turns on.

When the facility says coverage is ending

From Medicare.gov's fast appeals page and the skilled nursing booklet:

1. At least 2 days before covered care ends, the facility gives a Notice of Medicare Non-Coverage (NOMNC) with the last covered day. If you don't get one, ask.
2. For a fast appeal, call the BFCC-QIO on the notice by noon the day before that date. Ask the doctor or therapist to send anything that supports more care.
3. The facility then gives a Detailed Explanation of Non-Coverage saying why, and under which rule.
4. The reviewer decides by close of business the day after it has what it needs. If it says coverage should end, your parent isn't charged for care before the date on the notice, but may owe for days after.

Miss the noon deadline and there are still appeal rights, on different terms: call the BFCC-QIO for Original Medicare, or the plan (or the BFCC-QIO) for Medicare Advantage.

If your parent stays on after coverage ends, in Original Medicare the facility must give a notice called the SNF ABN, or a denial letter, before it can ask your parent to pay. Your parent can ask the facility to bill Medicare anyway for an official decision (a "demand bill") and doesn't have to pay the disputed amount until Medicare decides. One exception: when the stay was never covered because there was no 3-day hospital stay, CMS's billing fact sheet says the facility isn't required to give that notice, though CMS strongly encourages it.

After rehab, it's often home with home health or outpatient therapy. If a fall started all this, our guide on what to do after a parent falls has a room-by-room check for the house.

Frequently asked questions

Does observation status count toward the 3-day rule?

No. Only time as a formally admitted inpatient counts, not ER or observation time, even overnight. If your parent was admitted and later switched to observation, they may be able to appeal the change.

Does Medicare Advantage have a 3-day rule for skilled nursing?

Plans may waive it. But a plan may require approval before admission, limit your parent to network facilities, and charge copayments during the first 20 days. Check the plan's Evidence of Coverage or call.

How many days of rehab does Medicare pay for?

Up to 100 days per benefit period in Original Medicare: days 1 to 20 with no daily charge after the Part A deductible, then a daily coinsurance through day 100. Coverage ends sooner if daily skilled care is no longer needed.

Can rehab end because my parent stopped improving?

Not for that reason alone. The Jimmo settlement confirmed coverage depends on needing skilled care, including care to maintain a condition. If coverage is ending, use the NOMNC to request a fast appeal.

Keep the dates in one place

Nearly everything here turns on dates: the admission order, the discharge, the day a notice arrived. You can track them with a notebook and this guide. If you'd also like your parent's insurance, doctors, medications and legal papers organized before the next hospital stay, Emergency Binder Now builds a printable binder from about 25 minutes of guided questions, plus a list of what's still missing. You can see a sample binder first.

This article is general information, not medical, legal or financial advice. Medicare rules and plan terms change, and Medicare Advantage plans set their own requirements. For your parent's situation, ask their care team, their plan, 1-800-MEDICARE or your local State Health Insurance Assistance Program.