How Much Does Knee Replacement Surgery Cost? What Medicare Covers and What You Pay

Has your knee started deciding what your day looks like — which stairs you avoid, which walks you skip, which chairs you can get out of? When pain begins to run your schedule, knee replacement surgery often comes up. And right behind the medical question comes the money question: how much will this actually cost me?

The honest answer is that it depends on where you have the surgery, how it is billed, and what coverage you carry. But the range is knowable, and so is the way Medicare splits the bill. Here is the full picture, in plain language.

1. The Sticker Price: What a Knee Replacement Costs in Total

A total knee replacement is major surgery, and the full billed price reflects that. Across the United States, the total cost of the procedure commonly falls somewhere between $15,000 and $50,000 or more, and in high-cost areas it can go higher. Where you live matters a great deal — the same surgery can cost twice as much in one city as in another.

Very few people pay that full sticker price. If you have Medicare or other insurance, the amount you personally owe is a much smaller piece of it. But it helps to know the whole bill, because your share is calculated from it.

2. What the Bill Is Made Of

A knee replacement is not one charge. It is a bundle of charges that arrive on separate bills:

• Facility fee — the hospital or surgical center, operating room, and your room and nursing care if you stay overnight
• Surgeon's fee — the orthopedic surgeon's professional charge for the operation itself
• Anesthesia — the anesthesiologist's fee, billed separately in most cases
• The implant — the artificial joint itself, usually included in the facility charges
• Before surgery — imaging, lab work, and pre-operative clearance visits
• After surgery — physical therapy, follow-up visits, prescription pain medication, and equipment such as a walker or cane

Physical therapy deserves a special mention. Recovery from a knee replacement takes weeks of guided exercise, and those therapy visits add up. Ask early how many sessions are expected and what each one will cost you.

3. How Medicare Pays: Part A Covers the Hospital Stay

Medicare covers knee replacement surgery when your doctor documents that it is medically necessary — usually after imaging shows advanced joint damage and other treatments, such as therapy, medication, or injections, have not given you enough relief.

If your surgery is billed as an inpatient hospital stay, Medicare Part A pays the hospital portion. In 2026, you owe the Part A deductible of $1,736 per benefit period, and then nothing more for covered hospital services during the first 60 days of the stay. The surgeon's fee is billed under Part B, so you would also owe 20 percent of the approved amount for the surgeon's services after the Part B deductible ($283 in 2026).

If you have a Medigap (Medicare Supplement) policy, it may pay some or all of these deductibles and percentages for you, depending on the plan. That is one of the biggest reasons two neighbors can have the same surgery and very different bills.

One more concept helps here: the Part A deductible is charged per benefit period, not per year. A benefit period begins when you are admitted to a hospital and ends after you have been out of hospital-level care for 60 days in a row. Most knee replacement patients pay it once — but if you had another hospital stay earlier in the year, ask whether your surgery starts a new benefit period, because a second deductible is possible.

4. The Outpatient Shift: When Part B Pays Instead

Here is a change many people do not expect. A growing share of knee replacements are now done as outpatient procedures — you arrive in the morning and go home the same day, sometimes from a hospital outpatient department and sometimes from an ambulatory surgical center. Recovery at home, with visiting therapy, works well for many healthier patients.

Outpatient surgery is billed under Medicare Part B, not Part A. That means you pay 20 percent of the Medicare-approved amount for the facility and the surgeon after meeting the Part B deductible. Twenty percent of a large bill can exceed the Part A deductible, and Original Medicare has no yearly cap on that 20 percent unless you have supplemental coverage.

With a Medicare Advantage plan, the math is different again: many plans use fixed copays for surgery, and most require prior authorization. The status on your bill — inpatient or outpatient — is one of the most important cost questions you can ask, and it is worth asking before, not after.

5. What Changes Your Out-of-Pocket Bill

• Inpatient or outpatient status — which part of Medicare pays, and how your share is calculated
• Supplemental coverage — a Medigap policy or Medicare Advantage plan can shrink your share dramatically
• Deductibles already met — if you have already paid your deductible for the year, your share drops
• Length of stay and complications — extra nights, or a stay in a rehabilitation or skilled nursing facility, add new charges (Part A covers skilled nursing only under specific conditions, and only after a qualifying inpatient hospital stay of at least three days)
• Where you live and where you go — prices vary widely by region and facility

6. Questions to Ask Before You Schedule

1. Will my surgery be billed as inpatient or outpatient, and why?
2. What is my estimated total out-of-pocket cost, in writing, with my specific coverage?
3. Are the surgeon, anesthesiologist, and facility all in my plan's network?
4. Does my plan require prior authorization, and who obtains it?
5. How many physical therapy sessions are planned, where will they happen, and what will each cost me?
6. If I need rehabilitation after surgery, what will my coverage pay for — and what will it not?

Key Takeaway

A knee replacement's full price often lands between $15,000 and $50,000 or more, but your personal share depends mainly on three things: whether the surgery is billed as inpatient (Part A, with the $1,736 deductible in 2026) or outpatient (Part B, with 20 percent coinsurance), whether you have supplemental coverage, and how your recovery is arranged. Ask about status, network, and therapy costs before you schedule — those answers are worth real money.

This article was written with the help of generative AI.

For general information only, not medical advice.

Consult a qualified professional for your situation.