Observation status: the hospital stay that doesn't count

There is a specific phone call we get more than almost any other. A daughter is standing in a skilled nursing facility's business office being told that Medicare will not pay, that the rate is a few hundred dollars a day, and that they need a decision today. Her mother was in the hospital for three nights. She watched them do it. And somewhere in a chart, those three nights were labelled observation rather than inpatient, and Medicare's skilled nursing benefit never switched on.

Nobody lied to her. Nothing improper happened. The system worked exactly as designed, and the design has a trapdoor in it.

Observation is a billing and legal classification, not a description of the care. A patient under observation can be in a normal hospital room, on a normal ward, receiving IV fluids, cardiac monitoring, imaging and specialist consults from the same staff who treat admitted patients. From the bed, it is indistinguishable from being admitted.

The difference is that Medicare treats them as an outpatient who happens to be in the building. The hospital is saying, in effect, that it is still deciding whether this person is sick enough to admit.

The self-administered drug charge is the smaller problem but the one that generates the most outraged phone calls. Under observation, the hospital's pharmacy is an outpatient pharmacy, and it is out of network for essentially every Part D plan. So a patient's own blood pressure tablet, handed to them in a paper cup, can appear on the bill at a price that bears no relationship to what the pharmacy down the road charges. If your parent is under observation and stable, ask whether they can take their own medications from home instead. Many hospitals allow it.

It is worth understanding, because it explains why arguing with the nurse will not help. Hospitals have been audited aggressively for years over admissions that federal reviewers later judged unnecessary, with the payment clawed back. Observation is the safer classification for the hospital. Utilization review staff, not the treating physician, often make the call, and they apply criteria that have nothing to do with how worried your family is.

The rule they are applying is generally the two-midnight benchmark: if the admitting doctor expects the patient will need hospital care spanning at least two midnights, inpatient admission is appropriate. If not, observation. The expectation has to be documented in the medical record at the time — which is precisely where families have leverage.

If a hospital provides observation services as an outpatient for more than 24 hours, federal law requires it to give the patient a written notice called the Medicare Outpatient Observation Notice — the MOON — no later than 36 hours after observation began, or sooner if the patient is discharged, transferred or admitted before then. A staff member must also explain it verbally, and the patient or their representative is asked to sign.

• The MOON states that your parent is an outpatient, not an inpatient.
• It must give the reason for that status.
• It must explain the cost consequences, including the effect on skilled nursing coverage.
• It applies to Medicare Advantage enrollees as well as Original Medicare.

Signing it does not mean you agree. It means you received it. Read it, keep it, and photograph it with your phone — it is the document that proves what you were told and when.

Almost all of the leverage is here, before discharge. Once the stay is over, you are appealing rather than negotiating.

1. 1.Ask the status question every day, in these words: "Is she admitted as an inpatient, or is she under observation?" Ask the attending physician or the case manager, not the bedside nurse, and ask again each morning — status can change mid-stay in either direction.
2. 2.If the answer is observation and your parent is clearly unwell, ask the attending physician directly whether they expect the stay to span two or more midnights, and if so, to document that expectation and reconsider inpatient admission. This is a conversation with the doctor, because it is a clinical judgement, and the doctor is the only person who can make it.
3. 3.Ask to speak to the hospital's case manager or utilization review nurse. They are the ones applying the criteria, and they can tell you exactly what is missing from the record.
4. 4.If rehab or a nursing home is likely after discharge, say so out loud and early. Discharge planners frequently do not realize the family is heading that way, and the status question becomes urgent the moment they do.
5. 5.Get the MOON, read it, and keep it.
6. 6.Write down names, dates and times. Every conversation. This is the evidence for any later appeal.

For most of Medicare's history there was no way to challenge an observation designation at all — it was treated as a hospital billing decision rather than something a patient could appeal. A nationwide class action, Alexander v. Azar, changed that. The rule took effect in late 2024, and the notice and fast-appeal process it created went live on 14 February 2025.

The right is narrower than families often hope, so it is worth being precise about who it covers. Your parent qualifies for the fast appeal if they are in Original Medicare, were formally admitted as an inpatient, were then reclassified to outpatient observation during that same stay, and either:

• They have Part B and were in the hospital three or more consecutive days but classified as an inpatient for fewer than three of them, or
• They do not have Part B at all.

Two groups are outside it. Someone placed under observation from the outset and never admitted has no reclassification to appeal. And Medicare Advantage enrollees appeal through their plan's process instead, not this one.

Then file before discharge, and understand exactly why the timing matters. If the appeal is requested with the Quality Improvement Organization while your parent is still in the hospital, the hospital cannot bill them until the QIO has decided and any reconsideration is complete. File after discharge and it is treated as an untimely, standard appeal — the appeal rights survive, but the hospital may bill while it is pending. Same appeal, very different position to be in.

A successful appeal can restore the skilled nursing coverage and require a refund of what the family already paid out of pocket for covered care.

One route has closed. A retrospective process covered stays going back to 1 January 2009, and its filing window ended on 2 January 2026. Requests after that date are denied as untimely unless the family establishes good cause in writing — serious illness or having been given incorrect information both count, but they have to be argued.

The picture differs in two directions. Most Advantage plans do not impose the three-day inpatient requirement before skilled nursing coverage, which removes the worst consequence. But those plans do require prior authorization for the nursing facility stay, and denials and early terminations of rehab coverage are common. The appeal route runs through the plan, with fast-track review available through a Quality Improvement Organization when coverage is being cut off.

So the question to ask an Advantage plan is not about status. It is: has the skilled nursing stay been authorized, for how many days, and what happens when that authorization runs out.

This is close to the centre of what a navigator does, because it is a problem made entirely of timing and paperwork. We ask the status question daily so a family does not have to remember to, we get the case manager on the phone, we make sure the physician's two-midnight expectation is documented while it can still be documented, and we start the appeal on the day it becomes necessary rather than the week after discharge.

“The question costs nothing to ask and can be worth thirty thousand dollars. Ask it every morning.”