Medicare’s 100-Day Skilled Nursing Rule, Explained

Quick answer: Medicare covers up to 100 days of skilled nursing facility care per benefit period after an inpatient hospital stay of at least three days. Days 1 to 20 cost $0 and days 21 to 100 cost $217 a day. Coverage of the 100 skilled nursing days stops sooner if your parent no longer needs daily skilled nursing or therapy.

The Medicare skilled nursing 100 days benefit is one of the most misunderstood parts of senior care. Many families hear “100 days” and assume Medicare guarantees more than three months of free rehab. In practice, most Medicare skilled nursing stays end well before day 100, often with only two days’ notice. This guide explains how Medicare SNF coverage works, the three-day hospital stay rule, why coverage ends early, how to appeal, and how to plan the next step, whether that is home, assisted living, a board and care home, or long-term nursing home care.

What does Medicare’s 100-day skilled nursing benefit cover?

Medicare Part A covers short-term care in a Medicare-certified skilled nursing facility (SNF) when a patient needs skilled services every day after a hospital stay. A SNF stay under Medicare includes:

• A semi-private room and meals
• Skilled nursing care
• Physical, occupational and speech therapy
• Medications given during the stay
• Medical supplies and equipment used in the facility
• Medical social services and dietary counseling
• Ambulance transportation when other transport would endanger health

Medicare skilled nursing coverage does not include custodial care alone. If your parent needs only help with bathing, dressing, toileting or supervision, without a daily skilled need, Medicare will not pay for the SNF stay. Our overview of skilled nursing homes in San Diego explains how short-term rehab differs from long-term nursing home care.

What counts as daily skilled care?

The 100 skilled nursing days only apply while your parent needs care that requires a licensed nurse or therapist, on a daily basis. Common examples include:

• Physical, occupational or speech therapy at least five days a week
• IV medications or tube feedings
• Complex wound care, such as a surgical wound or a stage 3 pressure injury
• New injections, catheter care or ostomy teaching
• Close nursing observation after a serious change in condition

The skilled need usually has to relate to the condition treated in the hospital, or to a condition that started during the SNF stay.

What does a Medicare skilled nursing stay cost?

Medicare skilled nursing coverage is split into three phases within each benefit period:

• Days 1 to 20: Medicare pays the full cost. Your parent pays $0.
• Days 21 to 100: your parent pays a daily coinsurance, currently $217. Medicare pays the rest.
• Day 101 and beyond: Medicare pays nothing. Your parent pays the full daily rate, unless Medi-Cal or another payer steps in.

At $217 a day, days 21 to 100 can cost up to $17,360 out of pocket under Original Medicare. A Medicare Supplement (Medigap) Plan G or Plan N usually covers the full SNF coinsurance. Medicare Advantage plans set their own skilled nursing copays, often charging a daily amount that starts before day 21, so check the plan’s Evidence of Coverage.

What is Medicare’s three-day hospital stay rule?

Under Original Medicare, your parent must be formally admitted to a hospital as an inpatient for at least three consecutive days before the skilled nursing benefit applies. Hospitals count this as three midnights as an inpatient. The day of discharge does not count, and time in the emergency room before admission does not count.

Your parent generally must enter the SNF within 30 days of leaving the hospital, for a condition treated in the hospital.

Why does observation status matter for skilled nursing coverage?

Observation status is the most common reason families are surprised by a SNF bill. A patient can spend three or more nights in a hospital bed, receive tests and treatment, and still be classified as an outpatient “under observation.” Those days do not count toward the three-day inpatient requirement.

To protect Medicare skilled nursing coverage:

1. Ask the hospital directly: “Is my mother admitted as an inpatient, and on what date and time?”
2. Watch for the Medicare Outpatient Observation Notice (MOON), which hospitals must give to patients held under observation for more than 24 hours.
3. If your parent is under observation and needs rehab afterward, ask the doctor whether the medical facts support inpatient admission.

Many Medicare Advantage plans waive the three-day rule entirely but require prior authorization before the SNF admission.

Why does Medicare SNF coverage end before 100 days?

Medicare skilled nursing coverage ends when your parent no longer needs daily skilled care, not on a fixed date. Common reasons include:

• Reaching therapy goals, such as walking a set distance safely
• Declining or being unable to participate in therapy
• Care needs shifting to custodial help only
• A Medicare Advantage plan deciding further days are not medically necessary

Importantly, Medicare does not require a patient to keep improving. Under the Jimmo v. Sebelius settlement, skilled therapy or nursing needed to maintain function or slow decline can still be covered. If a facility says “Mom has plateaued, so Medicare is ending,” ask whether she still needs skilled care to maintain her current abilities.

How do you appeal when Medicare skilled nursing coverage ends?

The skilled nursing facility must give a written Notice of Medicare Non-Coverage at least two days before covered services end. To file a fast appeal:

1. Call the Beneficiary and Family Centered Care Quality Improvement Organization (BFCC-QIO) listed on the notice, by noon of the day before services are set to end.
2. The SNF must then give a Detailed Explanation of Non-Coverage, and the QIO reviews the medical records, usually within a few days.
3. Medicare coverage generally continues during the fast appeal.
4. If the QIO agrees with the facility, the notice explains the next level of appeal.

Families who miss the deadline can still appeal, but your parent may owe for the days in between. Keep copies of every notice and write down the names of everyone you speak with.

What is a benefit period, and when do the 100 days reset?

The 100 skilled nursing days are counted per benefit period, not per year. A benefit period begins the day your parent is admitted to a hospital or SNF as an inpatient and ends after 60 consecutive days without inpatient hospital or SNF care.

• A new hospital admission after that 60-day break starts a new benefit period, with a new Part A deductible (currently $1,736) and a fresh set of 100 skilled nursing days.
• A readmission within 60 days continues the same benefit period, so any SNF days already used still count.

There is no lifetime limit on the number of benefit periods.

What happens after 100 days in a nursing home?

On day 101, or sooner if skilled care ends, Medicare stops paying. Your parent can:

• Return home with help from family, private caregivers, or in-home care in San Diego, plus Medicare home health care if homebound.
• Move to assisted living or a board and care home for 24-hour personal care, paid privately or with benefits.
• Move to memory care if dementia, wandering, or confusion make other settings unsafe.
• Stay in the nursing home long-term, paying privately or through long-term care Medi-Cal. See our Medi-Cal eligibility guide.

Our comparison of assisted living vs. nursing homes helps families decide which path fits.

How should families plan while a parent is in skilled nursing?

Start discharge planning in the first week of the Medicare skilled nursing stay, not the last.

1. Ask the SNF social worker for the expected discharge date at every care conference.
2. Ask the therapists what level of help your parent will need after discharge: standby help, hands-on help, or two-person assistance.
3. Decide whether home is realistic, and who will cover nights.
4. Tour or research next settings now. San Diego board and care homes can often accept a resident within days, and many assisted living communities in San Diego can complete an assessment at the SNF.
5. Gather the physician’s report and medication list the next facility will need.

A placement advisor can do much of this legwork while your parent is still in rehab. Learn how a senior placement agency finds the right home or request a free senior care assessment.

Frequently asked questions

Does Medicare pay for 100 days in a skilled nursing facility? Medicare covers up to 100 skilled nursing days per benefit period, but only while daily skilled care is needed. Most stays are much shorter.

How much is the skilled nursing coinsurance? $217 per day for days 21 through 100 under Original Medicare.

Does observation status count toward the three-day rule? No. Only days formally admitted as an inpatient count toward Medicare’s three-day hospital stay rule.

Can my parent stay in the nursing home after Medicare stops paying? Yes, by paying privately or qualifying for long-term care Medi-Cal, if the facility has a long-term bed available.

Does Medicare keep paying if my parent is not improving? It can. Skilled care needed to maintain function or prevent decline may still be covered under the Jimmo settlement.

Do Medicare Advantage plans follow the 100-day rule? They cover up to 100 days per benefit period, but set their own copays and usually require prior authorization.

Conclusion: making the most of Medicare’s 100 skilled nursing days

Medicare’s skilled nursing benefit provides up to 100 days per benefit period, but only after a qualifying inpatient stay and only while daily skilled care is needed. Days 21 to 100 cost $217 a day. Confirm inpatient status in the hospital, appeal quickly if coverage ends unfairly, and plan the next living arrangement from the first week so a two-day notice never forces a rushed decision.