Three nights in a hospital bed, and Medicare says you were never admitted
Observation is a billing status, not a place. It looks identical from the bed, and it can cost you the nursing-home stay afterward. Since 2025 there is finally a way to appeal it.
Someone falls, breaks a hip, and spends three nights in a hospital. They are in a hospital bed, on a hospital ward, wearing a hospital gown, with hospital staff coming and going. Then they are discharged to a skilled nursing facility for rehabilitation, and a bill arrives for the whole thing.
The explanation is that they were never admitted. They were under observation, which Medicare treats as outpatient care — and outpatient days do not count toward the three inpatient days Medicare requires before it will pay for the nursing facility afterward.
Nothing about the room tells you which one you are in.
| Inpatient | You were formally admitted. Part A covers the stay, after one deductible. |
|---|---|
| Observation | Outpatient care that happens to involve a bed. Part B covers it — which means 20% coinsurance, and Original Medicare puts no cap on that. |
| The three-day rule | Medicare pays for a skilled nursing facility only after three consecutive inpatient days. Observation days never count toward them, however many there are. |
| The drugs you already take | Your routine medications given during an outpatient stay are often not covered the way they would be as an inpatient, and get billed separately. |
| What it can cost | The hospital coinsurance is the small part. The nursing facility that Medicare then declines to pay for is the large one. |
| Under Medicare Advantage | Plans can set their own rules here and some waive the three-day requirement entirely. Ask your plan rather than assuming either way. |
You are told, but not asked
Since 2017 hospitals have had to hand you a form called the MOON — the Medicare Outpatient Observation Notice — if you have been receiving observation services as an outpatient for more than 24 hours. It has to arrive within 36 hours, in writing, with a plain-language explanation of why you do not meet the criteria for admission.
It is worth knowing exactly what that form is and is not. It is a notification. For most of its existence it came with no right of appeal at all — it told you the decision and left you with it. People signed it while medicated, or exhausted, or without reading it, because it looked like the twentieth piece of paper in a stack of admission forms.
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A class action called Alexander v. Azar, upheld on appeal in 2022, forced Medicare to create an appeal that did not previously exist. CMS issued the rule in October 2024 and turned the process on in two stages:
- From 1 January 2025 — a retrospective appeal, filed after the fact, for Part A coverage that was denied because your status changed.
- From 14 February 2025 — an expedited appeal you can file while still in the hospital, before you are discharged, which is the version that can actually change what happens next.
There is an important limit on who this covers, and it is the thing most likely to be misunderstood. The appeal is for people in Original Medicare who were initially admitted as an inpatient and then reclassified to outpatient observation during the stay. It is not, on its own terms, a route for someone placed under observation from the moment they arrived.
That distinction matters enormously in practice and it is not intuitive. It is worth asking directly, in the hospital, which of the two happened — because the answer determines whether this door is open to you.
What to do, in the room
The single most useful question, asked out loud on the first day and again on the second: “Am I an inpatient or under observation right now?” Not have I been admitted, which people answer loosely, and not am I staying overnight, which is not the same question. Ask for the answer plainly, and ask again if the stay goes on, because the status can be changed partway through.
If the answer is observation, ask the hospital's case manager or discharge planner whether the attending physician believes an inpatient admission is justified. Status is a clinical judgment applied against Medicare's criteria, not a fixed fact, and doctors do revisit it.
If you were admitted and then moved to observation, say that you want to appeal, and say it before discharge. That is the expedited route, and it is the one with teeth.
And if you are the family member rather than the patient: this is the thing to handle. Someone who has just broken a hip is in no condition to interrogate their own billing status, and the window in which the question matters is the few days when they are least able to ask it.
Nobody in the room will raise this with you. The form arrives, it gets signed, and the consequence shows up weeks later in an envelope.
One more piece of housekeeping: hospitals move to an updated MOON form in April 2026, which requires an individualized written explanation of why you specifically do not meet inpatient criteria. If you are handed one, read that section. It is the hospital's own reasoning, in writing, and it is what any appeal will turn on.
This is general information, not personal advice. We report the rules, the numbers and the deadlines as clearly as we can. We don't know your income, your state, your health or your family — and all four can change the answer. Treat this as a good place to find the right questions, not a substitute for someone looking at your actual situation.
Where these facts come from
Checked on 10 August 2026 against the sources listed below. Dollar limits and program rules change — if you're reading this well after that date, verify the numbers at the links below.
- CMS — Hospital Appeals, Change of Inpatient Status (Alexander v. Azar) — https://www.cms.gov/medicare/appeals-grievances/original-medicare-appeals/hospital-appeals-change-inpatient-status-alexander-v-azar
- CMS — Appeal Rights for Certain Changes in Patient Status, final rule — https://www.federalregister.gov/documents/2024/10/15/2024-23195/medicare-program-appeal-rights-for-certain-changes-in-patient-status
- Medicare — Skilled nursing facility care — https://www.medicare.gov/coverage/skilled-nursing-facility-care
- Center for Medicare Advocacy — Outpatient observation status — https://medicareadvocacy.org/medicare-info/observation-status/
Edward Silva
Edward spent more than forty years as a computer professional — long enough to pick up one useful occupational habit: when somebody hands you a summary, go and read the actual documentation. He started The Second Half Guide after noticing that most writing aimed at people his age was either talking down to him or quietly selling him something, and that the plain facts — the dates, the thresholds, the dollar figures — were somehow the hardest part to find.
He's married, with two grown sons, both married themselves. He is not a financial adviser, an attorney or an insurance agent, and this site doesn't tell you what to do with your money. It tells you what the rules actually say, and links to where he checked.