This article is for general educational purposes and is not medical, financial, or insurance advice; all figures reflect calendar year 2026 unless a different year is labeled inline, and your actual cost depends on your plan, surgeon, region, and clinical eligibility.
TL;DR — Quick Verdict
- Total knee replacement at an ambulatory surgery center (ASC) typically runs $15,000–$25,000 cash versus $30,000–$50,000+ for a hospital inpatient stay — a facility-fee gap that can exceed $20,000.
- RAND Corporation’s 2025 analysis found the same total knee arthroplasty priced from $18,500 to $50,800 inside a single metro area, with the ASC cheapest and the academic hospital most expensive.
- For Original Medicare patients the math flips: the beneficiary’s out-of-pocket difference between settings is under $400, per CMS estimates, because Medicare caps your exposure regardless of site.
- Medicare’s national ASC facility payment for the knee arthroplasty code (CPT 27447) is $9,393.16 in 2026 — a fraction of hospital charge-master prices.
- Comparison result: for a healthy, well-supported commercially insured patient, the ASC wins on price and often on convenience; for medically complex patients, the hospital’s higher cost buys real safety margin.
- Recommendation: if you’re a good ASC candidate with commercial insurance, request a Good Faith Estimate from both settings before scheduling — the paperwork is free and the savings can reach five figures.
An identical total knee replacement can carry a $30,000 price swing depending on nothing more than which building you walk into. RAND Corporation’s 2025 analysis documented total knee arthroplasty ranging from $18,500 to $50,800 within one metro area — same surgery, same city, sometimes the same surgeon. The cheapest venue was an ambulatory surgery center (ASC); the priciest sat twelve miles away inside a large academic hospital. That single data point exposes the core problem: site of service, not clinical difficulty, drives most of what you pay.
This guide breaks down what a knee replacement actually costs at a hospital versus a surgery center in 2026 — cash prices, commercial-insurance exposure, and Medicare’s very different math. You’ll see the CMS facility payment for the procedure code, a side-by-side cost table, the scenarios where each setting wins, and the mistakes that quietly add thousands. Vendors like MAKO and ROSA robotic systems factor in too. Every figure traces to a named primary source, from the Centers for Medicare & Medicaid Services to peer-reviewed claims research.
What a Knee Replacement Costs: Hospital vs Surgery Center in 2026
Two numbers matter most: the facility fee (the charge for the room, staff, and equipment) and the total allowed amount (everything — surgeon, anesthesia, implant, and facility combined). The facility fee is where hospitals and ASCs diverge hardest, because a hospital carries emergency departments, inpatient wards, and 24-hour staffing that an outpatient surgery center simply doesn’t.
Cash and commercial-insurance prices for total knee arthroplasty cluster into two bands by setting. The ranges below reflect reputable secondary market data, cited because provider-specific national point prices are not published by any single primary source; use them as planning brackets, not quotes.
Sources: RAND Corporation 2025 metro price analysis; market ranges compiled from published cash-price data (verify at cms.gov price transparency files). Ranges are planning estimates; period- and provider-specific point prices were unavailable.
The implant line deserves a second look. A knee implant that costs the same box in either building can be marked up far more inside a hospital charge master, which is one reason hospital-billed inpatient vs outpatient status cost differences matter so much. Comparing venues starts with pulling published rates, and hospital hospital price transparency tools now make that possible before you schedule.
What Medicare Pays — and Why Your Out-of-Pocket Barely Moves
Medicare rewrites the entire comparison. Since 2018, CMS removed total knee arthroplasty (CPT 27447) from the Inpatient-Only List, meaning Medicare now reimburses the procedure at hospital outpatient departments and ASCs for eligible patients. The program pays facilities a set rate rather than the charge-master fiction — and it caps what you owe.
For 2026, the national unadjusted Medicare ASC facility payment for CPT 27447 is $9,393.16, per the CMS ASC Payment System (individual centers see this amount adjusted by local wage index). That’s the facility component only; your surgeon and anesthesiologist bill separately under Part B.
Source: CMS 2026 Parts A & B Premiums and Deductibles Fact Sheet; CMS ASC Payment System (2026); CMS beneficiary cost estimate via GoodRx.
Here’s the counterintuitive result: for Original Medicare, CMS estimates the beneficiary pays less than $400 more or less regardless of setting. Inpatient, you owe the $1,736 Part A deductible; outpatient or ASC, you owe the Part B deductible plus 20% coinsurance, which a Medigap plan usually absorbs. So while the hospital’s sticker is far higher, your share is nearly flat. If you carry Medicare Advantage, prior-authorization rules and network status matter more than site — worth checking against appealing prior authorization denials if you’re told no.
How the Facility Fee Is Actually Built
Picture two patients, both getting CPT 27447 next Tuesday. Maria, 61, is commercially insured, walks two miles a day, and has no heart or lung issues. Her surgeon books her into an ASC. She arrives at 6 a.m., is discharged by mid-afternoon, and her facility never bills for a bed-night, a hospital pharmacy, or overnight nursing. Her total allowed amount lands near $19,000.
Robert, 68, has controlled diabetes, sleep apnea requiring CPAP, and a cardiac history. His surgeon routes him to the hospital, where a one- to two-night observation stay, on-site cardiology backup, and inpatient monitoring are built into the price. His facility fee alone can double Maria’s total. Neither surgery is harder to perform — the difference is the standby infrastructure Robert’s risk profile requires.
That’s the mechanism: the facility fee prices capacity you might need, not just care you receive. Robotic-arm systems like MAKO or ROSA add $1,500–$5,000 to either setting and may improve implant precision, but they don’t change the hospital-versus-ASC gap. Understanding what a hospital stay costs by diagnosis and length explains why even a single avoided night reshapes the bill, and why site-of-service selection is the biggest lever a patient controls.
Surgery Center vs Hospital: Which Is Better for Your Knee Replacement?
Price alone doesn’t decide this. Safety, recovery support, and your own body weigh in. A direct comparison for a commercially insured, medically stable patient looks lopsided on cost — but eligibility is the gate.
The ASC advantage is money and speed: 30–50% lower episode cost for eligible patients, same-day discharge, lower infection exposure, and a leaner bill. The hospital advantage is the safety net: immediate access to intensive care, blood banking, specialist consults, and overnight observation. For a healthy patient with a helper at home, that net often goes unused — you pay for insurance you don’t cash in.
ASCs turn away patients with a BMI over 40, uncontrolled diabetes, significant heart disease, or CPAP-dependent sleep apnea. If you clear those hurdles and have reliable home support, the surgery center is usually the better economic and clinical fit. If you don’t, the hospital’s higher price is buying something real. This is the same trade-off explored in depth for a surgery center vs hospital procedure costs comparison across procedures.
Verdict
For a healthy, commercially insured patient with home support, the ASC is the clear winner — comparable outcomes at $10,000–$20,000 less. For patients with significant comorbidities, the hospital’s higher facility fee is justified by the safety infrastructure, and cost should not override clinical routing. Medicare patients: pick on convenience and surgeon quality, since your out-of-pocket barely changes either way.
What Most People Get Wrong About Knee Replacement Pricing
Three errors cost patients the most, and all three are avoidable before the surgery is booked.
Assuming the hospital is safer, therefore worth the money, for everyone. The consequence is thousands in avoidable facility fees for a patient who was an ideal ASC candidate. The correct action: ask your surgeon directly whether you clinically qualify for an ASC — many patients are never offered the option they’d pass.
Ignoring the implant markup ranks second. Hospitals routinely mark up the same knee component far above its acquisition cost, so an uninformed patient absorbs a $5,000-plus inflation buried in the bill. The fix is to ask which implant your surgeon plans to use and whether a clinically equivalent, lower-cost option exists.
Skipping the written estimate is the costliest. Without a Good Faith Estimate, patients discover their true exposure only after the bundled rate blows past their out-of-pocket maximum. Under federal law you can request one in advance; pairing it with knowledge of hospital bill negotiation strategies and your rights under out-of-network billing protections turns a surprise into a plan. If a bill still looks wrong afterward, finding and disputing medical billing errors can recover overcharges that slip through.
Is a Surgery Center Worth It for You?
Run yourself through the logic. If you’re under a BMI of 40, have no uncontrolled cardiac or metabolic disease, don’t depend on CPAP, and have someone at home for the first 48 hours, the ASC almost certainly saves you $10,000–$20,000 on a commercial plan with equal outcomes — it’s worth it.
Should any of those flags apply, the calculus shifts toward the hospital, and the higher cost becomes a reasonable purchase rather than waste. Borderline cases — say, well-controlled diabetes with good home support — deserve a frank surgeon conversation rather than a price-first decision.
Medicare beneficiaries occupy a special position: because your out-of-pocket difference is under $400 either way, choose on surgeon reputation, convenience, and recovery preference, not sticker price. For commercially insured shoppers, the highest-leverage move is comparing written estimates across both settings before committing, a discipline that applies to any expensive procedure and is covered under price shopping elective procedures. The tools exist; using them is what separates a $19,000 knee from a $50,000 one.
Frequently Asked Questions
Does Medicare cover knee replacement at a surgery center?
Yes. CMS removed total knee arthroplasty (CPT 27447) from the Inpatient-Only List in 2018, so Medicare now pays for the procedure at ambulatory surgery centers and hospital outpatient departments for eligible patients. The national 2026 ASC facility payment is $9,393.16, with your surgeon and anesthesia billed separately under Part B after the $283 deductible.
How much cheaper is an ASC than a hospital for a knee replacement?
For commercially insured or cash-pay patients, ASC episodes typically run 30–50% less — roughly $15,000–$25,000 versus $30,000–$50,000+ inpatient. RAND Corporation’s 2025 metro analysis found the same surgery priced from $18,500 at an ASC to $50,800 at an academic hospital in one city. For Original Medicare, however, your personal out-of-pocket difference is under $400.
Who is not eligible for outpatient knee replacement?
Surgery centers generally exclude patients with a BMI over 40, uncontrolled diabetes, significant heart disease, or CPAP-dependent sleep apnea, and those without reliable home support for the first 48 hours. These patients are routed to a hospital, where the higher facility fee covers overnight monitoring and immediate specialist access. Your surgeon makes the final eligibility call based on your full medical picture.
How We Researched This Article
This analysis draws on primary government data and peer-reviewed research, supplemented by reputable market compilations where provider-specific point prices are not centrally published. Medicare payment and cost-sharing figures come directly from the Centers for Medicare & Medicaid Services, including the CMS 2026 Parts A & B Premiums and Deductibles Fact Sheet and the Federal Register CY 2026 Inpatient Hospital Deductible notice. The Part A deductible ($1,736) and Part B deductible ($283) are official 2026 figures effective January 1, 2026.
The national ASC facility payment for CPT 27447 ($9,393.16) reflects the CMS ASC Payment System for 2026; individual centers receive wage-index-adjusted amounts. Site-of-service cost comparisons draw on RAND Corporation’s 2025 metro-area price analysis and peer-reviewed claims research published in the National Library of Medicine’s PMC archive comparing commercial payments across hospital outpatient departments and ASCs.
Cash and commercial price ranges are modeled brackets, not measured point prices — they compile published market data because no single primary source publishes provider-level national totals. Where sources conflicted, we reported ranges rather than fabricating precision. Medicare cost-sharing figures are measured from official CMS notices; setting-level cash prices are estimated. This research was last conducted in July 2026. Limitations include regional variation of 30–50%, plan-specific benefit design, and clinical eligibility that no price table can capture. Additional context on inpatient classification came from CMS guidance available at Medicare.gov (verify at cms.gov). All figures were verified against named primary sources before publication.