Newsroom · Colorado
Does Medicare Cover Knee Replacement Surgery in 2026?
Yes. The part people get wrong is which Medicare pays — and that answer moved on January 1.
The bottom line
- Medicare covers knee replacement — total or partial — when your doctor documents it as medically necessary. That part isn't in question.
- Inpatient or outpatient decides the bill. Inpatient: one $1,736 Part A deductible for the facility. Outpatient: 20% under Part B after the $283 deductible.
- January 1, 2026 pushed more of these outpatient. CMS began phasing out its Inpatient Only list, removing 285 mostly musculoskeletal procedures for this year.
- Outpatient means no qualifying hospital stay — so Medicare-covered rehab in a skilled nursing facility is off the table, because the 3-day rule reads zero.
- Original Medicare has no annual out-of-pocket maximum. That's the whole reason a supplement exists, and the reason the 20% isn't a small number in a surgical year.
Almost everybody asks the coverage question, and almost nobody asks the one that determines what they pay. "Does Medicare cover a knee replacement" has a short answer — yes, when it's medically necessary — and the short answer is where most articles stop. But two people in Grand Junction can have the same operation, by the same surgeon, in the same building, in the same week, and open envelopes with completely different numbers on them. The difference isn't their coverage. It's a status decision made about them, usually before they arrive, and increasingly it lands on the more expensive side.
What changed on January 1, 2026
Medicare used to keep a list of procedures it would pay for only if you were admitted as an inpatient — the Inpatient Only list. Total knee replacement came off that list in the CY2018 outpatient payment rule; total hip replacement followed in CY2020, the same rule that first allowed knee replacements to be done in ambulatory surgical centers.
Then, in the final rule issued November 21, 2025 and effective January 1, 2026, CMS decided to retire the list altogether over three years. 285 procedures — mostly musculoskeletal ones — came off for 2026, and 271 of those were added to the list of procedures Medicare will pay for in a freestanding surgery center.
Read that as a clinical statement and it's unremarkable: surgery has genuinely gotten faster and safer, and a lot of people go home the same day. Read it as a billing statement and it matters to you directly, because the setting decides which part of Medicare pays, and the two parts don't work alike.
Source: CMS — CY2026 Hospital OPPS & Ambulatory Surgical Center Final Rule (CMS-1834-FC, Nov 21, 2025). Nothing here changes whether the surgery is covered — only where it can be done and how it's billed.
The same knee, two different bills
This is the comparison that should be on the kitchen table before the surgery date, not after:
| Admitted as an inpatient | Treated as an outpatient | |
|---|---|---|
| What triggers it | A physician's order admitting you as an inpatient, generally when care is expected to cross two midnights. | Everything else — including a planned overnight stay in a hospital bed with no admission order. |
| Which part pays the facility | Part A | Part B |
| Your facility cost | $1,736 for the benefit period, however long you stay up to day 60. | $283 deductible if unmet, then 20% of the approved amount. |
| Surgeon and anesthesia | 20% under Part B, billed separately. | 20% under Part B, billed separately. |
| Counts toward the 3-day rule for rehab? | Yes, if the inpatient stay reaches 3 days in a row. | No. Observation and outpatient days never count. |
| Annual out-of-pocket maximum | None under Original Medicare. | None under Original Medicare. |
2026 cost-sharing figures: CMS — 2026 Medicare Parts A & B Premiums and Deductibles (Nov 14, 2025). Status rules: Medicare.gov — Inpatient or outpatient hospital status affects your costs.
The inpatient column has a ceiling built into it. Whatever the hospital charges, your Part A share of the facility bill for that benefit period is $1,736 in 2026 — one number, paid once, covering days 1 through 60. People find that reassuring, and they should.
The outpatient column has no ceiling of that kind. You pay the $283 Part B deductible if you haven't already met it for the year, then 20% of the Medicare-approved amount — for the facility, and separately for the surgeon, and separately again for the anesthesiologist. Twenty percent of a joint replacement is not a copay-sized number.
The cap that exists, and the one that doesn't
There is one real protection here, and it's worth knowing precisely because it gets misquoted. Under section 1833(t)(8)(C)(i) of the Social Security Act, the copayment a hospital outpatient department can collect from you for a single covered service in a year cannot exceed the inpatient hospital deductible for that year — $1,736 in 2026. If the arithmetic would have produced more, Medicare absorbs the difference.
Three limits on that, all of which matter:
- It applies to the facility's outpatient copayment, service by service. It is not a cap on your total bill for the episode.
- It doesn't touch the professional fees. The surgeon and the anesthesiologist bill their own Part B services at 20%, and those ride outside it.
- It is not an annual out-of-pocket maximum. Original Medicare doesn't have one. Have a knee replaced in March and something cardiac in October, and the 20% starts over on every new service, all year, with no stop.
If you've read that the cap is "$1,676," that's not wrong so much as last year's — $1,736 is the 2026 figure, and the cap moves with it every January. For national averages by setting, Medicare's own Procedure Price Lookup publishes what Medicare pays and what a person with no supplemental coverage would owe, though it excludes physician fees and doesn't adjust for Grand Junction.
Who actually decides inpatient or outpatient — and it isn't you
The rule of thumb Medicare uses is the two-midnight rule: an inpatient admission is generally appropriate for Part A payment when the admitting practitioner expects you'll need hospital care crossing at least two midnights, and the medical record supports that expectation. A modern knee replacement usually doesn't, which is exactly why so many now land on the outpatient side.
Here's the part that trips people up: you can sleep in a hospital bed, wear a hospital bracelet, eat hospital meals for two days, and still be an outpatient the whole time, because no physician wrote an order admitting you. Medicare.gov says it plainly — your status affects your costs, and observation time is outpatient time.
Ask this out loud, before the date is set
"Am I being scheduled as an inpatient or an outpatient?" Ask the surgeon's office, and ask the case manager again each day you're in the building. Write down the answer and who gave it to you. It is a two-second question that governs four-figure outcomes.
Talk it through with Brian →The rehab consequence nobody warns you about
This is where the outpatient shift stops being an accounting curiosity. Medicare will cover a stay in a skilled nursing facility for rehabilitation only after a qualifying inpatient hospital stay of at least 3 days in a row. Time under observation, and time as an outpatient, never counts toward it — even overnight.
So the sequence writes itself. Outpatient knee replacement, home the same day, recovery goes sideways, and the discharge planner suggests a couple of weeks of skilled rehab. There is no qualifying stay behind you, and the entire bill is yours. When a stay does qualify, Medicare pays days 1–20 in full after the $1,736 deductible and charges $217 a day for days 21–100 — figures we walk through in detail in how many days Medicare pays for rehab.
Two exits exist and both are worth asking about by name. Some Accountable Care Organizations hold a 3-Day Rule Waiver. And Medicare Advantage plans may waive the 3-day requirement entirely — many do — though they generally substitute prior authorization and a network in its place.
Physical therapy afterward: no limit, no ceiling
The single most common thing people are told about post-surgical therapy is wrong. There is no visit cap. Congress repealed the outpatient therapy caps in 2018, and coverage has turned on medical necessity ever since. What remains is a paperwork threshold — $2,480 in 2026 for physical therapy and speech-language pathology combined — past which your therapist attaches a KX modifier attesting the care is still reasonable and necessary. Claims above that line without the modifier get denied, which is why clinics sometimes say you've "used up" your visits.
The real exposure is the shape of the benefit, not its length: outpatient therapy is Part B, so it's 20% per visit after the deductible, indefinitely, with no annual maximum. Reach the $2,480 threshold and you've already spent roughly $496 in coinsurance, and the meter keeps running. We go deeper in how many physical therapy sessions Medicare covers.
The version that costs nothing: if you qualify as homebound after surgery, therapy delivered under a home health plan of care is covered at $0. Ask whether you qualify before you assume you don't.
What this means with Medigap, and with Advantage
Everything above describes Original Medicare by itself, which very few people should actually be carrying alone.
With a Medicare Supplement (Medigap) policy, the 20% is precisely what the policy exists to pay. A comprehensive letter plan covers the Part A deductible and the Part B coinsurance, which flattens both columns of that table into something predictable — the trade being a real monthly premium on top of the $202.90 Part B premium. Which letter you hold changes the details, and the Plan G versus Plan N comparison is the version of this question most Western Slope households are actually deciding.
With Medicare Advantage, the arithmetic is different rather than simpler. You get a yearly out-of-pocket maximum, which Original Medicare doesn't offer, and that is a genuine protection in a surgical year. You also get prior authorization on major joint surgery from most plans, plan-specific criteria on the inpatient-versus-outpatient call, and a network that decides which surgery center you may use. Our piece on prior authorization in 2026 covers how to get that confirmed in writing before the date. Neither structure is better in the abstract; they fail differently, and which failure you'd rather have is a personal question.
The Grand Junction version of this
Mesa County has more orthopedic capacity than most of the rural West — 4 Medicare-certified hospitals sit in the county, including Intermountain Health St. Mary's Regional Hospital and Community Hospital in Grand Junction, plus Family Health West Hospital in Fruita. That's a real advantage over a household in San Juan County or Moab, who may be driving here for the surgery in the first place.
It also means the setting question is live for you in a way it isn't everywhere: a knee replacement here can plausibly be scheduled as an inpatient admission, as a hospital outpatient procedure, or in a surgery center, and those are three different lines on your bill. Ask which one, and ask whether the surgery center is hospital-owned or freestanding.
The county's chronic-condition profile is the backdrop, from CDC PLACES 2023 model-based prevalence among adults:
Source: CDC PLACES, 2023 — via the Medicare On Main Data Desk, Mesa County, Colorado.
Obesity at 29.8% and diabetes at 8.1% aren't a knee statistic, and I won't pretend they are. What they tell you is the shape of the surgical year around here: joint work rarely arrives alone, and a household that hits the 20% on a knee in spring is often the same household hitting it again on something else by fall. That's the argument for looking at your coverage structure rather than at any single procedure's price.
What I'd do, in order
| Step | What you say | When |
|---|---|---|
| 1. Before scheduling It decides Part A versus Part B, and everything downstream. | Ask the surgeon's office, in these words: is this being scheduled as inpatient or outpatient, and at which facility? Write down the answer and the date you got it. | Do first |
| 2. If you have Advantage An approval obtained after the fact is not an approval. | Ask the office to confirm in writing that prior authorization was requested and approved for the procedure, the facility, and the surgeon — before the surgery date. | Do first |
| 3. During the hospital stay Status can change mid-stay, and it governs whether rehab is covered. | "Am I an inpatient today, or an outpatient?" — asked out loud, daily, of the doctor or case manager. | Every day |
| 4. Before discharge A SNF stay you don't qualify for runs to real money fast. | Ask where rehabilitation is expected to happen: home, outpatient clinic, or a skilled nursing facility — and whether your stay qualifies for the last one. | Do third |
| 5. After the bills land Denials are appealable; unread notices are not. | Check the Medicare Summary Notice against what you were told. If the status changed from inpatient to outpatient, that's an appealable determination. | Do last |
None of that requires knowing anything technical. It requires asking a status question that hospital staff answer routinely and patients almost never think to ask — and asking it early enough that the answer can still be discussed with your surgeon rather than discovered on a statement.
How we know all this: the Medicare On Main Data Desk frames every article with public data. The 2026 cost figures on this page — the $1,736 inpatient hospital deductible, the $217 per-day skilled nursing coinsurance for days 21–100, the $202.90 standard Part B premium and the $283 Part B deductible — come from CMS's 2026 Parts A & B premiums and deductibles fact sheet, published November 14, 2025. The Inpatient Only list phase-out, the 285 procedures removed for CY2026 and the 271 added to the ambulatory surgical center list come from CMS's CY2026 OPPS/ASC final rule with comment period (CMS-1834-FC), issued November 21, 2025 and effective January 1, 2026; total knee replacement was removed from that list in the CY2018 rule and total hip replacement in CY2020. The outpatient copayment cap is section 1833(t)(8)(C)(i) of the Social Security Act, implemented at 42 CFR Part 419. The two-midnight standard comes from CMS's own fact sheet; the 3-day qualifying-stay rule and the inpatient-versus-outpatient status rules come from Medicare.gov; the $2,480 therapy threshold follows the 2018 repeal of the outpatient therapy caps. County health figures are CDC PLACES 2023 for Mesa County. No hospital, surgery center, or insurance company paid for a mention here, and nothing above is a recommendation of a specific facility or plan. This is education, not advice; confirm coverage, costs, and eligibility with your surgeon's billing office, a licensed agent, or Medicare.gov.
Frequently asked questions
Does Medicare cover knee replacement surgery?
Yes, when your doctor documents that it's medically necessary. Both Original Medicare and Medicare Advantage cover total and partial knee replacement. What Medicare does not do is guarantee which part pays: if you're formally admitted as an inpatient, the surgery is a Part A hospital stay and your facility cost is the $1,736 inpatient deductible for that benefit period. If the hospital treats you as an outpatient — including an overnight stay in a bed — it's a Part B service and you pay 20% of the Medicare-approved amount after the $283 annual deductible. Same knee, same surgeon, two different bills.
Is knee replacement inpatient or outpatient with Medicare?
It can be either, and increasingly it's outpatient. CMS removed total knee replacement from its Inpatient Only list in the CY2018 outpatient payment rule and total hip replacement in CY2020, which allowed both to be performed and billed as outpatient procedures. In the CY2026 final rule issued November 21, 2025, CMS went further and began phasing the Inpatient Only list out entirely over three years, removing 285 mostly musculoskeletal procedures effective January 1, 2026 and adding 271 of them to the list of procedures payable in an ambulatory surgical center. The decision is made by your surgeon and the hospital under Medicare's two-midnight guidance, not by you and not by how serious the operation feels.
How much does a knee replacement cost with Medicare?
It depends entirely on the inpatient-or-outpatient question above. As an inpatient, your hospital cost for the benefit period is the $1,736 Part A deductible in 2026 — one flat amount, however long you stay up to day 60. As an outpatient, you pay the $283 Part B deductible if you haven't met it, then 20% of the approved amount for the facility and 20% for the surgeon and the anesthesiologist, each billed separately. Medicare law does cap what a hospital outpatient department can charge you in copayment for a single covered service at the inpatient deductible for that year, $1,736 in 2026. That cap does not cover the professional fees, and Original Medicare has no annual out-of-pocket maximum at all. Medicare.gov's Procedure Price Lookup shows national averages by setting.
Does Medicare cover physical therapy after knee replacement?
Yes, and there is no visit limit. Congress repealed the outpatient therapy caps in the Bipartisan Budget Act of 2018; coverage now turns on medical necessity and documentation. What survives is a paperwork threshold — $2,480 in 2026 for physical therapy and speech-language pathology combined — above which your therapist attaches a KX modifier attesting the care is still reasonable and necessary. Outpatient therapy is a Part B service, so you pay 20% of each visit after the deductible, with no ceiling. If you qualify as homebound after surgery, home health therapy is covered at $0 under a different benefit.
Will Medicare pay for rehab in a nursing home after knee surgery?
Only if you had a qualifying inpatient hospital stay of at least 3 days in a row first. This is the consequence of outpatient knee replacement that almost nobody is warned about: if your surgery was billed as outpatient, or you spent the night under observation rather than as an admitted inpatient, the clock reads zero qualifying days and a skilled nursing facility stay afterward is entirely your bill. When the stay does qualify, Medicare covers days 1–20 in full after the $1,736 deductible and charges $217 a day for days 21–100. Ask out loud, every day of a hospital stay: am I an inpatient today, or an outpatient?
Does Medicare Advantage require prior authorization for a knee replacement?
Most plans do for major joint surgery, and that is one of the real differences between Advantage and Original Medicare here. Every plan publishes its own list of services needing approval first, and no two lists match — so the practical step before a scheduled surgery is to have the surgeon's office confirm in writing that authorization was requested and approved before the date, not after. Advantage plans may also apply their own criteria to the inpatient-versus-outpatient call, restrict which facility you can use, and require an in-network surgery center. The offsetting benefit is a yearly out-of-pocket maximum, which Original Medicare alone doesn't have.
Does Medicare cover a walker, a knee brace, or a CPM machine after surgery?
Walkers, crutches, wheelchairs and hospital beds are durable medical equipment under Part B, which pays 20% of the approved amount after the deductible when the item is ordered by your doctor and supplied by a Medicare-enrolled supplier. Braces are covered under a related Part B category with the same 20% share. Coverage of continuous passive motion devices is limited and condition-specific rather than automatic after any knee replacement, so ask the supplier to confirm Medicare coverage in advance rather than assuming it. In every case, whether the supplier accepts Medicare assignment changes what you owe.
Sources
- CMS — 2026 Medicare Parts A & B Premiums and Deductibles (Nov 14, 2025) — the $1,736 Part A deductible, $217 SNF coinsurance, $202.90 premium and $283 deductible for 2026.
- CMS — CY2026 Hospital OPPS & Ambulatory Surgical Center Final Rule (CMS-1834-FC, Nov 21, 2025) — the three-year Inpatient Only list phase-out and the 285 procedures removed for CY2026.
- Medicare.gov — Inpatient or outpatient hospital status affects your costs — how inpatient versus outpatient status changes what you pay.
- CMS — Two-Midnight Rule fact sheet — the standard hospitals apply when deciding to admit.
- CMS Medicare Learning Network — Major Hip & Knee Replacement compliance tips — CMS's own compliance guidance on hip and knee replacement claims.
- eCFR — 42 CFR Part 419, Prospective Payment System for Hospital Outpatient Department Services — the regulation implementing the outpatient copayment cap.
- Medicare.gov — Procedure Price Lookup for outpatient services — national average Medicare payments and copayments by setting.
- Medicare.gov — Skilled nursing facility (SNF) care coverage — the 3-day qualifying stay and the 100-day limit.
- Medicare.gov — Physical therapy coverage — outpatient physical therapy coverage and cost sharing.
- Medicare.gov — Durable medical equipment (DME) coverage — walkers, crutches and other equipment after surgery.
- Medicare.gov — Home health services coverage — the homebound benefit that covers therapy at $0.
- Medicare.gov — How to compare Medigap policies — which Medigap letters cover the Part B coinsurance.
- Medicare Plan Compare (Medicare.gov) — price your own doctors and drugs against every plan in your ZIP.
- CDC PLACES, 2023 — via the Medicare On Main Data Desk — Mesa County chronic-condition prevalence.
