A hospital case manager says your mother is being discharged “to rehab,” and adds the reassuring part: “Medicare covers up to 100 days.” Everyone exhales.

Then, somewhere around week three, a letter arrives saying coverage is ending. Nobody understands why, and the facility wants to talk about private pay.

Here is what actually happens, in the order it happens.

“Up to 100 days” is true — and deeply misleading

Medicare Part A does cover skilled nursing facility care up to 100 days in a benefit period. But look at how those days are paid in 2026:

Run the arithmetic on the middle row. Eighty days at $217 is $17,360 — and that is the best case, the one where everything goes as long as it possibly can. Many families have a supplement (Medigap) that covers this; many do not.

The bigger problem is that very few people get anywhere near 100 days. The 100 is a ceiling, not a promise.

The three-day rule, and the trap inside it

Under Original Medicare, skilled nursing coverage requires a qualifying hospital stay of at least three consecutive days as an admitted inpatient, not counting the day of discharge.

Here is where families get hurt: time spent in the hospital under “observation status” does not count — even if your father slept in a hospital bed for three nights, wore the bracelet, and ate hospital food. Observation is billed as outpatient care. If those nights were observation, there may be no Medicare nursing home coverage at all.

The hospital is required to give written notice when someone has been in observation more than 24 hours. It is easy to miss during a stressful week, and it is worth asking the question directly: “Is she admitted as an inpatient, or is she under observation?” Ask early, ask again, and write down the answer.

Medicare Advantage plays by different rules

More than half of Missourians on Medicare are now in a Medicare Advantage plan, and these plans work differently for nursing home care:

• The three-day rule is often waived — which is genuinely better, and one of the plans’ real advantages.
• But the plan decides how long you stay. Coverage typically requires prior authorization, and the plan reviews the case continuously against its own criteria. Families frequently find coverage ending sooner than it would have under Original Medicare.
• Networks matter. The facility with the open bed, or the one closest to home, may be out of network.

If your parent is on an Advantage plan, get the plan’s name and member number in hand on day one. The conversations you will be having are with the plan, not with Medicare.

Why the facility would rather see Original Medicare

Nursing facilities rarely say this to families directly, but it shapes a great deal of what happens after admission.

Under Original Medicare, a facility gets a published rate, no prior authorization, and a stay that runs as long as the clinical need is documented. Under a Medicare Advantage plan, the facility has to request authorization up front, justify the stay again every few days, and accept a negotiated rate that is generally lower. Denials and appeals are part of the routine. Some facilities have stopped contracting with certain Advantage plans altogether, which is why a family occasionally learns that the nearest facility, or the one with the open bed, cannot take their parent at all.

None of that means Advantage plans are a bad choice — for many people the extra benefits and lower premiums are worth it. But it does mean that a nursing home stay is the point where the trade-off becomes real, and where a family may find the stay ending sooner than a neighbor’s did under Original Medicare.

The part almost nobody is told: leaving an Advantage plan can be a one-way door

Families in this situation often reach the same conclusion — we should switch him back to Original Medicare — and discover it is not that simple.

Switching back to Original Medicare is easy enough during open enrollment. The problem is the Medicare Supplement (Medigap) policy that makes Original Medicare affordable — the one that covers that $217-a-day coinsurance and the 20% on the Part B side. Buying one is only guaranteed in narrow circumstances:

• During the six-month Medigap open enrollment window that begins at 65 when you enroll in Part B;
• Under a federal “trial right,” if someone joined an Advantage plan when first eligible for Medicare and leaves it within twelve months;
• If the plan terminates, leaves the area, or the member moves out of its service area.

Outside those windows, insurers in most states — Missouri included — may medically underwrite the application. They can charge more, exclude pre-existing conditions, or decline outright.

Consider what that means for the person in the bed. Someone who has just had a stroke, or received a dementia diagnosis, or spent three weeks in the hospital, is exactly the applicant an underwriter declines. The practical result is that they stay on the Advantage plan — not by choice, but because the door back has closed.

This is worth understanding before a health crisis, while the choice is still genuinely open. If you are helping a parent choose coverage during open enrollment, it is one of the most consequential decisions on the table, and the one least likely to be explained.

“She’s plateaued, so Medicare is cutting her off”

Families are told this constantly. It is one of the most persistent misunderstandings in the entire system.

Medicare coverage of skilled care does not depend on the patient continuing to improve. A federal court settlement, Jimmo v. Sebelius, made this explicit: skilled care needed to maintain a person’s condition, or to slow decline, can qualify for coverage. “She has stopped making progress” is not, by itself, a lawful reason to end Medicare coverage.

You also have appeal rights. When you receive a notice that skilled nursing coverage is ending, that notice includes a deadline for a fast appeal to an independent review organization. The deadlines are short — often a day or two — but the appeal is free, and it is granted more often than families expect.

When Medicare stops, what actually pays?

This is the part that no one explains at discharge. There are only three sources of money for long-term nursing home care in Missouri:

1. Private pay. The state’s official average is $8,235 a month — $98,820 a year.
2. Long-term care insurance, if a policy was purchased years ago. Most families do not have one.
3. Medicaid (MO HealthNet), which is the only realistic long-term payer for the overwhelming majority of families.

Medicare is not a long-term care program and never was. It is short-term, rehabilitation-focused coverage. The moment it ends, a family is on the clock at roughly $99,000 a year until Medicaid takes over — and every month spent private-pay is money that leaves permanently.

What to do in the first week

1. Confirm inpatient vs. observation status while they are still in the hospital, and get it in writing.
2. Find out which Medicare they have — Original Medicare with a supplement, or a Medicare Advantage plan — and whether there is a long-term care policy anywhere.
3. Ask the facility for its private-pay daily rate in writing, so you know the real number rather than the state average.
4. Do not transfer, gift, or retitle anything yet. Missouri looks back five years, and well-meant transfers create months of Medicaid ineligibility.
5. Find out whether a Financial Power of Attorney exists and what it allows. This single document determines how many options a family has.
6. Talk to an elder law attorney before the Medicare days run out — not after. Options are widest while there is still time.

Find out where your family stands

Nine questions, about ninety seconds, and nothing is saved or sent to us. You will get a straight answer — including if the answer is that you do not need a lawyer.

Are we a fit? Take the 9-question assessment

Or call us: (573) 334-5125

See the current Missouri Medicaid figures →

Figures are 2026 amounts: Medicare Part A skilled nursing coinsurance of $217 per day for days 21–100, and Missouri’s average private-pay nursing rate of $8,235 per month. Medicare amounts change each January; Missouri Medicaid figures change several times a year. This page is general information, not legal advice, and reading it does not make you a client of the Law Office of Mark McMullin. Coverage decisions depend on facts specific to each person — please speak with an elder law attorney before making decisions about care or assets.