Total knee replacement surgery (billed under CPT code 27447) costs between $35,000 and $70,000 at most U.S. hospitals without insurance in 2026. Medicare pays roughly $1,159 for the surgeon's fee and $12,000 to $14,000 for the hospital stay. The gap between what hospitals charge and what payers actually pay is enormous, and that gap is where billing errors, duplicate charges, and unbundled line items hide. If you just got a bill from a knee replacement, there is a good chance something on it is wrong.
Quick Answer: The national average hospital charge for CPT 27447 (total knee arthroplasty) is approximately $22,000 to $50,000 in 2026. Medicare's physician payment is $1,159.35 based on the 2026 conversion factor of $33.40. Self-pay patients who negotiate or use an ambulatory surgery center can sometimes pay as little as $15,000 to $28,000. Billing errors appear on an estimated 49 to 80 percent of hospital bills, and knee replacements are among the most commonly overbilled orthopedic procedures.
What CPT 27447 Actually Covers
CPT 27447 is the billing code for a complete total knee arthroplasty, meaning the surgeon replaces both the femoral condyle (thigh bone end) and tibial plateau (shin bone end), with or without the patella. It is one of the most common elective surgeries in the United States, with roughly 800,000 procedures performed per year according to CMS data.
The code has a 90-day global period. That 90-day global period is what turns this into a bundled payment, and it is critical to understand when reviewing your bill.
What the 90-Day Global Period Bundles In
When your surgeon bills CPT 27447, the single code includes:
- The surgical procedure itself
- All pre-operative visits after the decision to operate has been made
- The day of surgery care
- All routine post-operative office visits for 90 days following surgery
- Removal of sutures and staples
- Pain management directly related to the procedure
This means your surgeon cannot legally bill a separate office visit code (such as 99213 or 99214) for any routine follow-up within 90 days of the operation. If you see separate E/M (evaluation and management) charges from your orthopedic surgeon during that 90-day window, that is a red flag worth challenging.
What Is NOT Bundled
The global period only covers the operating surgeon's professional fees. The following are always billed separately and legitimately:
- Hospital facility fees
- Anesthesia (billed by the anesthesiologist separately)
- The implant itself
- Physical therapy and rehabilitation
- Independent lab or imaging tests ordered after surgery
- Complications requiring a return to the operating room
2026 Cost Breakdown by Payer Type
Without Insurance (Self-Pay)
| Cost Component | Low Estimate | High Estimate |
|---|
| Hospital facility fee | $15,000 | $40,000 |
| Surgeon fee | $5,000 | $10,000 |
| Anesthesia | $2,000 | $4,000 |
| Implant (prosthesis) | $5,000 | $12,000 |
| Post-op physical therapy | $2,000 | $5,000 |
| Total (2026 estimate) | $29,000 | $71,000 |
Major teaching hospitals in New York, California, and Massachusetts typically land at the top of this range. Ambulatory surgery centers (ASCs) and community hospitals in the South and Midwest are usually 30 to 50 percent lower. Cash-pay bundled packages from some surgery centers start around $15,000 to $28,000 when you pay upfront.
Medicare Reimbursement in 2026
Medicare's payment structure separates the professional fee (surgeon) from the facility fee (hospital or ASC).
| Setting | Medicare Pays (Facility) | Patient Pays Out-of-Pocket |
|---|
| Hospital Outpatient | ~$12,196 | ~$1,927 |
| Ambulatory Surgery Center | ~$8,410 | ~$2,102 |
| Inpatient (DRG 470) | ~$12,000-$14,000 | Part A deductible ($1,736 in 2026) |
| Surgeon fee (all settings) | $1,159.35 | 20% coinsurance after deductible |
Source: Medicare.gov Procedure Price Lookup, CPT 27447 and CMS 2026 Physician Fee Schedule.
Note: Medicare made a -7.79% reduction to CPT 27447 reimbursement in 2026 compared to 2025. This reflects broader CMS musculoskeletal reimbursement adjustments. Your surgeon's actual payment may vary slightly by geographic adjustment factor.
With Private Insurance
Out-of-pocket costs with employer coverage or an ACA marketplace plan typically fall between $3,000 and $8,000, depending on your deductible and coinsurance. Most plans classify total knee replacement as a major procedure subject to your annual deductible. If you have a high-deductible health plan (HDHP) with a $6,000 deductible, expect to hit that deductible entirely on this surgery alone.
The Billing Reality: Where Overcharges Hide
An estimated 49 to 80 percent of hospital bills contain errors according to billing advocacy organizations, and orthopedic procedures like knee replacements are among the highest-risk categories. The CoveredUSA Bill Analyzer compares each line item on your itemized bill to Medicare benchmark rates, flagging charges that are significantly above what the procedure typically reimburses nationwide.
Here are the most common billing errors specific to CPT 27447:
1. Unbundled Post-Op Visits
As described above, any routine office visit with your orthopedic surgeon within 90 days of surgery should be included in the global period payment, not billed separately. If you see separate E/M codes (99212 through 99215) from the same surgeon during that 90-day window, that is a likely unbundling error.
2. Duplicate Implant Charges
The implant (prosthesis hardware) should appear once on the facility bill. Occasionally it appears as both a supply line item and embedded in a procedure code. Compare the number of line items related to "implant," "prosthesis," "tibial component," or "femoral component" against your surgical records.
3. Upcoded Anesthesia Time
Anesthesia is billed in time units, typically 15-minute increments. A total knee replacement takes 90 to 120 minutes on average. If your anesthesia bill reflects 4 or more hours, ask for the anesthesia start and stop times from the operative record.
4. Facility Fee vs. Surgeon Fee Confusion
Patients frequently receive two separate bills: one from the hospital or surgery center, and one from the surgeon's practice. These are legitimate and expected. What is NOT legitimate is being billed twice for the same service from the same provider, or being charged for both a hospital outpatient facility fee and an inpatient admission fee for the same day.
5. Physical Therapy Billed Under the Surgeon's NPI
Physical therapy services should come from a separate PT provider, not from your surgeon's billing. If your surgeon's office is billing PT codes during the global period, that is a bundling violation.
How to Get Your Knee Replacement Bill Reviewed
- Request an itemized bill from the hospital business office within 30 days of receiving your Explanation of Benefits (EOB). Federal law (the No Surprises Act and Hospital Price Transparency rules) gives you the right to an itemized bill.
- Get your operative report from medical records. This confirms exactly what was done, what implant was used, and how long the surgery took.
- Cross-reference the CPT codes on your bill against what your EOB shows your insurer processed.
- Look up each CPT code on Medicare's rate as a benchmark. If a code is billed at 5 to 10 times the Medicare rate, it may be worth a formal dispute.
- Upload your itemized bill to the free CoveredUSA Bill Analyzer to get a line-by-line comparison against Medicare rates and identify which charges are outliers. The tool flags potential errors, overcharges, and charity care options in about 30 seconds.
- File a formal billing dispute with the hospital if you find errors. Request that your case be reviewed by the billing compliance department, not just the billing department.
- Contact your state insurance commissioner if your insurer processed the claim incorrectly or refused to apply your negotiated rate.
Does Medicare Cover Knee Replacement?
Yes. Medicare Part A covers the inpatient hospital facility fee. Medicare Part B covers the outpatient facility fee and the physician service. Most total knee replacements are now done in outpatient settings or ambulatory surgery centers, making Part B the primary coverage for the majority of patients.
Medicare coverage requirements as of 2026:
- You must have a documented diagnosis of severe knee osteoarthritis, rheumatoid arthritis, or joint destruction from injury
- Conservative treatments (physical therapy, injections, anti-inflammatory medications) must have been tried and documented as insufficient
- Your orthopedic surgeon must certify medical necessity
- Pre-authorization is required by most Medicare Advantage plans (not traditional Medicare fee-for-service)
If you are on Medicare Advantage (Part C), check whether your plan requires pre-authorization before scheduling surgery. Missing this step is one of the most common reasons Medicare Advantage claims get denied.
Medicare patients should also check eligibility for the Medicare Savings Programs if out-of-pocket costs are a concern. These programs can eliminate or reduce your Part A deductible and Part B coinsurance. Check your eligibility at coveredusa.org/screener.
Does Medicaid Cover Knee Replacement?
Coverage varies by state. Most state Medicaid programs cover total knee arthroplasty when it is medically necessary, but prior authorization requirements and coverage criteria differ significantly. Some states require documentation of failed conservative treatment for a minimum of 6 months. A small number of states restrict coverage to certain age groups or BMI ranges for joint replacement.
Contact your state Medicaid agency directly or use the screener at coveredusa.org/screener to verify your current coverage.
How to Apply or Verify Your Coverage
If you are approaching a knee replacement and are uninsured or underinsured, here are your steps:
- Check Medicare eligibility. If you are 65 or older, or have a qualifying disability, visit medicare.gov to verify your enrollment status and Part A/B coverage.
- Check Medicaid eligibility. Income-based Medicaid may cover surgery if your income is below your state's threshold. Apply through your state Medicaid agency or healthcare.gov.
- Check ACA marketplace plans. Open enrollment runs November 1 through January 15 for most states. Special enrollment may apply if you recently lost other coverage. Marketplace plans at all metal tiers cover hospitalization including joint replacement.
- Ask about hospital charity care. Most nonprofit hospitals are required by IRS rules to offer charity care programs. If your income is below 200 to 300 percent of the Federal Poverty Level, you may qualify for a significant reduction or elimination of your bill. Ask the hospital financial counselor before or immediately after surgery.
- Request a bundled price quote. Before surgery, ask the hospital or surgery center for a bundled all-in price that includes facility, implant, and surgeon fees. Some centers offer significant cash-pay discounts if you ask explicitly.
Documents you will typically need for coverage applications:
- Photo ID
- Proof of income (pay stubs, tax return, or Social Security award letter)
- Proof of address
- Social Security number
- Citizenship or immigration status documentation
- Current insurance card if applicable
Common reasons coverage applications get denied:
- Income reported incorrectly (use gross annual income, not net)
- Citizenship documentation missing or expired
- Address does not match state records
- Application submitted outside an enrollment window without a qualifying special enrollment event
- Duplicate application submitted (if you applied before and did not close the prior application)
Frequently Asked Questions
How much does a knee replacement cost with Medicare in 2026?
With traditional Medicare, your out-of-pocket cost depends on the setting. In an outpatient hospital, Medicare pays roughly $12,196 of the facility fee and you pay about $1,927. In an ambulatory surgery center, Medicare pays about $8,410 and you pay roughly $2,102. Your surgeon receives $1,159.35 from Medicare, and you typically owe 20 percent coinsurance on that amount after your Part B deductible ($283 in 2026). Total out-of-pocket for most Medicare patients in 2026 ranges from $2,000 to $4,000 before any supplemental coverage.
What is CPT code 27447 exactly?
CPT 27447 is the Current Procedural Terminology code for a total knee arthroplasty, which means replacement of both the femoral condyle and tibial plateau of the knee joint. It is assigned by the American Medical Association and used by all U.S. payers to identify and price this specific procedure. The code carries a 90-day global period, meaning routine post-op care by the surgeon is bundled into the single code payment.
What is typically included in a knee replacement bundled payment?
The 90-day global period for CPT 27447 bundles together the surgeon's pre-operative evaluation after the decision for surgery, the surgical procedure itself, and all routine follow-up office visits within 90 days. It does not include the hospital facility fee, anesthesia, physical therapy, the prosthetic implant cost, or any unrelated medical care. Hospital bills and anesthesia are always separate.
Can I negotiate my knee replacement bill?
Yes. Hospitals routinely discount bills for self-pay patients and for patients who have already received an inflated chargemaster-rate bill. Studies consistently show that hospitals accept 20 to 50 percent discounts for patients who pay cash upfront or who formally dispute an itemized bill. Ask for the hospital's prompt-pay or financial assistance discount in writing before agreeing to any payment plan.
What is a reasonable price for knee replacement surgery?
Medicare's total payment to all providers (facility plus physician) for an outpatient total knee replacement averages around $13,000 to $15,000 in 2026, which is a reasonable benchmark for what the procedure actually costs to deliver. Hospital chargemaster prices of $40,000 to $70,000 are inflated starting points, not actual transaction prices. If you are self-pay, negotiating toward a rate close to the Medicare benchmark is a realistic target at most facilities.
What errors are most common on knee replacement hospital bills?
The most frequent billing errors on CPT 27447 claims include: unbundled post-operative visits billed during the 90-day global period, duplicate implant charges, upcoded anesthesia time, incorrect facility type billing (inpatient vs. outpatient), and separate charges for services already included in the global period. Requesting an itemized bill and comparing it to your operative report is the first step in catching these errors. You can also use the CoveredUSA Bill Analyzer at /medical-bill-analyzer to compare your bill against Medicare benchmark rates automatically.
Does the No Surprises Act help with knee replacement costs?
The No Surprises Act (effective 2022) primarily protects patients from surprise bills in emergency settings and from out-of-network providers at in-network facilities. For a scheduled knee replacement, the law requires hospitals to provide a good-faith cost estimate before the procedure if requested. It also requires that you be notified in advance if any provider (such as the anesthesiologist) is out-of-network. Request this estimate at least 3 business days before your surgery date.
How do I know if my knee replacement bill has errors?
Start by requesting a fully itemized bill from the hospital business office (not just the summary statement). Cross-reference every CPT code against your Explanation of Benefits from your insurer. Look for dates, duplicate codes, and any office visit charges from your surgeon within 90 days of surgery. For a faster review, upload the itemized bill to a bill analysis tool such as the CoveredUSA Bill Analyzer, which flags line items that are inconsistent with standard Medicare reimbursement benchmarks.
Upload your hospital bill to the free CoveredUSA Bill Analyzer to find errors, overcharges, and charity care options in 30 seconds.
