Resource Aid Center

6 min read · Last updated July 17, 2026

In this article

– Why the 3-day rule exists – Observation is the trap – What Medicare covers, and for how long – What Medicare will not pay for – Where Medicaid comes in – Mistakes that erase coverage – The next 30, 60, and 90 days – FAQ

The hospitalist told you this morning that your father is not safe to go home and needs a skilled nursing facility for rehab. Before you sign anything, ask one question that decides whether Medicare pays: has he been an admitted inpatient for three days, or has he been under observation?

Why the 3-day rule exists

Medicare Part A covers a stay in a skilled nursing facility, but only after what it calls a qualifying hospital stay. That means your parent must be formally admitted as an inpatient for at least 3 consecutive days, counting the admission day but not the discharge day. The rule and its exact wording are spelled out on Medicare’s own page for skilled nursing facility care.

Three days sounds simple. The catch is in how a hospital classifies those days.

Observation is the trap

Your parent can lie in a hospital bed for three nights, wear the gown, get the tests and the meals, and still not be an “inpatient” in Medicare’s eyes. Hospitals sometimes classify a stay as observation status, an outpatient category, even when it looks identical to admission from the bedside.

Observation days do not count toward the 3-day requirement. If your father spent two days under observation and one day as an admitted inpatient, he has one qualifying day, not three, and Medicare will not pay for the nursing facility that follows.

This is why you ask, out loud and early: “Is my parent an inpatient or under observation, and for which days?” Hospitals are required to give you a notice if you are under observation for more than 24 hours, but do not wait for the paperwork. Ask the case manager directly, and ask whether the status can be reviewed while there is still time.

What Medicare covers, and for how long

When the 3-day inpatient rule is met and a doctor orders skilled care, Medicare Part A covers a skilled nursing facility stay on this schedule, per benefit period:

– Days 1 through 20: Medicare pays the full cost of covered skilled services. – Days 21 through 100: Medicare still covers the stay, but your parent owes a daily copayment set each year by Medicare. – Day 101 and beyond: Medicare pays nothing. Your parent is responsible for the full cost.

A “benefit period” starts when your parent enters the hospital and ends after 60 days with no inpatient or skilled care. Understanding how those periods reset matters if a second hospitalization follows, and Medicare’s own getting-started guide walks through how the parts fit together.

What Medicare will not pay for

Here is the misconception that costs families the most. Medicare covers skilled care: rehab, wound care, therapy, the kind of medical service that needs a licensed professional. It does not cover custodial care, which is help with everyday living like bathing, dressing, eating, and supervision, when that is all a person needs.

Long-term nursing-home care is mostly custodial. So a parent who needs to live in a nursing home permanently is not covered by Medicare for that stay, no matter how many days pass. That gap is where families are blindsided, and it is where the next program comes in.

Where Medicaid comes in

Medicaid is the program that pays for long-term custodial nursing-home care for people with limited income and assets. It is jointly run by the federal government and each state, so the exact limits vary by where your parent lives, but two features hold almost everywhere.

First, there are income and asset limits. Your parent generally must be below a set asset threshold to qualify, which is why families sometimes must “spend down” savings on care before Medicaid begins.

Second, there is a 5-year lookback. When your parent applies, Medicaid reviews the previous 60 months of financial transfers. Assets given away or sold below value during that window can trigger a penalty period during which Medicaid will not pay. This is why moving money to protect it, done casually and late, backfires.

Mistakes that erase coverage

Three mistakes do the real damage.

Not checking inpatient-versus-observation before discharge. By the time you see the bill, the window to challenge the status may be gone. Ask while your parent is still in the bed.

Assuming Medicare covers a long-term nursing home. It does not. Planning as if it will leaves families unprepared for a cost that can run several thousand dollars a month.

Gifting assets during the lookback. Handing money to a grandchild or transferring the house without planning can create a Medicaid penalty later. If asset protection matters, that is a conversation for an elder-law attorney before you move anything, not after.

The next 30, 60, and 90 days

By day 30, confirm your parent’s hospital status in writing, and if a skilled nursing stay is approved, track which benefit day they are on so the day-21 copayment does not surprise you. By day 60, if long-term care looks likely, gather the full financial picture and learn your state’s Medicaid limits before spending anything down. By day 90, if Medicaid is the path, have the application moving and, for anything involving asset transfers, get professional advice so the 5-year lookback does not undo your planning.

The rehab clock and the coverage clock are not the same clock. Knowing which day your parent is on, in both, is how you keep a covered stay from turning into a bill nobody planned for.

Frequently asked questions

How do I find out if my parent is an inpatient or under observation? Ask the hospital case manager or the attending physician directly, and ask for it in writing. Hospitals must give you a notice if you have been under observation for more than 24 hours, but do not wait for it. Ask early, because the window to have the status reviewed is short and closes at discharge.

Does Medicare cover the nursing home if my parent only stayed two nights? No. The skilled nursing benefit requires a qualifying inpatient stay of 3 consecutive days, not counting the discharge day. Two nights, or three nights that include observation days, does not meet the rule, and Medicare will not pay for the skilled nursing facility that follows.

Who pays for a nursing home once Medicare’s 100 days run out? After day 100 in a benefit period, Medicare pays nothing for that stay. Long-term custodial care is then paid by the family privately or by Medicaid, if your parent meets the income and asset limits. There is no Medicare option for permanent custodial nursing-home care.

We might need Medicaid. Can we just give the savings to the kids first? Not safely. Medicaid reviews the last 5 years of transfers, and gifts made in that window can create a penalty period where Medicaid will not pay. If protecting assets matters, talk to an elder-law attorney before moving any money, so the planning does not backfire.

Who pays for a nursing home, at a glance? See the table below: Medicare covers short skilled stays after a qualifying hospital admission, Medicaid covers long-term custodial care for those who meet its limits, and private pay covers the rest until Medicaid eligibility is reached.

Payer	What it covers	The key rule
Medicare (Part A, skilled nursing)	Short-term skilled rehab and nursing after a hospital stay, up to 100 days per benefit period	Requires a 3-day qualifying inpatient stay; observation days do not count
Medicaid (long-term care)	Long-term custodial nursing-home care for those with limited income and assets	Income and asset limits apply, plus a 5-year lookback on transfers
Private pay	Any stay not covered above, including custodial care before Medicaid begins	Out of pocket until savings are spent down to Medicaid limits