Every year, more than 790,000 Americans undergo knee replacement surgery — and the majority of those patients are Medicare beneficiaries over the age of 65. If you or a loved one is facing chronic knee pain, bone-on-bone arthritis, or limited mobility that conservative treatments can no longer manage, the question you are asking is: Does Medicare cover knee replacement in 2026? The answer is yes — and understanding exactly what Medicare pays versus what you owe can mean the difference between thousands of dollars in unexpected bills or a procedure you can afford with confidence.
Medicare Coverage for Knee Replacement 2026: Yes, With Medical Necessity
Medicare coverage for knee replacement 2026 applies when the surgery is deemed medically necessary. This typically means you have severe osteoarthritis or another qualifying condition causing significant joint damage, disability, or pain that has not responded to at least three to six months of conservative treatment — including physical therapy, anti-inflammatory medications, and steroid injections. Medicare does not cover elective procedures, but total knee replacement clearly meets the standard of medical necessity for seniors who truly need it. The key is having proper documentation from your orthopedic surgeon and primary care physician.
Part A vs. Part B: Which Covers Your Knee Surgery?
Whether your surgery is covered by Part A or Part B depends on the setting — inpatient or outpatient. As of 2018, Medicare removed total knee replacement from its inpatient-only list, meaning your surgeon can now perform the procedure in an outpatient setting as well. Here is the complete 2026 cost breakdown:
| Setting | Covered By | Your Deductible (2026) | Coinsurance | Estimated Out-of-Pocket |
|---|---|---|---|---|
| Inpatient hospital | Part A | \,736 per benefit period | ash days 1–60 | ~\,736 total |
| Outpatient hospital or ASC | Part B | \83 per year | 20% after deductible | ~\,100 |
For inpatient surgery: the total cost of knee replacement ranges from ,000 to ,000 depending on the hospital and location. Medicare Part A’s \,736 deductible per benefit period covers your hospital stay, the procedure, anesthesia, and inpatient physical therapy for days 1 through 60. For outpatient surgery: Medicare Part B covers 80% of the Medicare-approved amount after your \83 deductible, leaving you with approximately \,100 out of pocket.
What Medicare Covers Beyond the Surgery
Medicare’s knee replacement coverage in 2026 extends well beyond the operating room. The full continuum of care is included:
- Pre-operative testing: X-rays, MRI, blood work, EKG, and pre-surgical evaluations (Part B, 20% coinsurance after deductible)
- Anesthesia: Covered as part of the inpatient or outpatient procedure
- Physical therapy (PT): Part B covers outpatient PT at 80% after deductible — critical for 6-12 weeks post-surgery
- Inpatient rehabilitation facility (IRF): Part A covers intensive inpatient rehab (days 1-20 at ash; days 21-100 at \94.50/day in 2026)
- Skilled nursing facility (SNF): Covered by Part A after a qualifying 3-night inpatient hospital stay
- Durable medical equipment (DME): Crutches, walkers, CPM machines — covered at 80% under Part B
- Home health care: If you are homebound after surgery, Medicare covers skilled nursing and home PT visits
How to Dramatically Reduce Your Out-of-Pocket Costs
Medigap (Medicare Supplement) Insurance
If you have a Medigap Plan G policy, it covers the 20% Part B coinsurance and Part A deductibles. With Plan G, your total out-of-pocket for knee replacement could be just the \83 annual deductible — or even less if already met. This is the single most powerful way to reduce surgical costs for Original Medicare beneficiaries.
Medicare Advantage (Part C)
Medicare Advantage plans have an annual out-of-pocket maximum of \,350 in 2026 for in-network services. Many MA plans have lower cost-sharing for major procedures. Always get pre-authorization before scheduling surgery if you have Medicare Advantage — failing to do so can result in a denied claim.
Medicare Savings Programs
If you have limited income and resources, a Medicare Savings Program through your state Medicaid agency can cover your Part A and Part B deductibles and coinsurance — potentially making knee replacement essentially free. Contact your State Health Insurance Assistance Program (SHIP) counselor to learn if you qualify.
Getting Pre-Authorization for Medicare Advantage Knee Replacement
Original Medicare (Parts A and B) does not require pre-authorization for knee replacement surgery. However, if you have a Medicare Advantage plan, pre-authorization is almost always required. Your orthopedic surgeon’s office typically handles the prior authorization process — confirm the request was submitted and approved before your surgery date. Keep a copy of the authorization number for your records.
How to Qualify: Medical Necessity Documentation
To ensure your surgery is covered, your medical records must document all of the following: a confirmed diagnosis of severe osteoarthritis or comparable joint disease (supported by X-ray or MRI), functional limitations significantly affecting daily activities, and documented failure of conservative treatment for at least three months. Your orthopedic surgeon and primary care physician should work together to build this record before submitting for coverage approval.
5 Steps to Prepare for Medicare-Covered Knee Replacement
- Document medical necessity thoroughly — Ensure your records show your diagnosis, failed conservative treatments, and the functional limitations the condition causes.
- Know your Medicare coverage type — Understand whether you have Original Medicare with or without Medigap, or a Medicare Advantage plan, to know your exact cost-sharing and pre-authorization requirements.
- Request a written cost estimate — Ask your Medicare Advantage plan or the hospital billing department for a written cost estimate before scheduling. This protects you from billing surprises.
- Choose in-network providers — If you have Medicare Advantage, verify the hospital, surgeon, and anesthesiologist are all in-network before your surgery date.
- Plan your recovery in advance — Arrange home health care or inpatient rehab before surgery. If SNF care is expected, confirm your 3-night inpatient hospital stay is documented to qualify.
The Bottom Line
Medicare absolutely covers knee replacement surgery in 2026 when medically necessary — and covers the full chain of care from pre-operative testing through physical therapy and home health. Your exact out-of-pocket cost depends on your specific Medicare coverage. With Medigap Plan G, a medically necessary knee replacement can cost very little out of pocket. Do not let fear of the bill delay a procedure that could restore your mobility, reduce your pain, and give you back the active life you deserve.
Sources
- Medicare.gov — Knee Replacement Coverage
- CMS — 2026 Medicare Parts A & B Premiums and Deductibles
- GoodRx — Medicare Knee Replacement Coverage
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