Insurance covers the knee replacement surgery itself, but not the robotic technology as a separate billable item. Major insurers including Aetna, UnitedHealthcare, and Blue Cross Blue Shield consider robotic assistance “integral to the primary procedure,” meaning it gets bundled into the same payment the surgeon would receive for a conventional knee replacement. The robotic component doesn’t get its own reimbursement line. What this means for your wallet depends on where the extra cost lands.
How Insurers Classify Robotic Assistance
Every major insurer treats robotic knee replacement the same way: the knee replacement is covered, but the robot is not a separately payable service. Aetna’s policy calls computer-assisted surgical navigation, including the widely used MAKO system, “experimental, investigational, or unproven” for knee arthroplasty, citing a lack of reliable evidence that it improves outcomes. UnitedHealthcare uses similar language, calling it “unproven and not medically necessary.” Anthem Blue Cross Blue Shield explicitly states that a specific billing code for robotic surgical systems (S2900) is “not reimbursable.”
This doesn’t mean your surgeon can’t use a robot. It means the insurer pays the same flat rate for the surgery whether a robot is involved or not. The hospital or surgical center absorbs the cost of the robotic equipment, or in some cases, passes a portion of it along to you.
What Medicare Covers
Original Medicare (Part A and Part B) covers total knee arthroplasty when it meets medical necessity criteria, regardless of whether the surgeon uses robotic assistance. The Centers for Medicare and Medicaid Services spells it out clearly: robotic tools are “not considered medically necessary and therefore not eligible for separate payment.” The surgery is reimbursed at the standard rate.
To qualify for coverage of the knee replacement itself, Medicare requires all five of the following: advanced joint disease (such as osteoarthritis with joint destruction), moderate to severe pain with loss of function measured on standardized scales, X-rays showing advanced arthritic changes (a Kellgren-Lawrence score of 2 or higher), at least three months of conservative treatment that didn’t work, and optimization of other health conditions like diabetes, obesity, or smoking. Your surgeon needs to document each of these in your medical record.
Medicare Advantage plans (Part C) follow the same general framework. They must cover everything Original Medicare covers, but they can layer on network restrictions or different cost-sharing structures. If your Medicare Advantage plan requires prior authorization for joint replacement, the approval process focuses on whether the surgery itself is justified, not on whether a robot will be used.
Where the Extra Cost Goes
Robotic knee replacements cost more to perform. A 2024 analysis from UT Southwestern Medical Center found that robotic procedures cost an average of about $2,400 more than conventional knee replacements, with some comparisons showing the gap reaching as high as $15,000. That cost difference comes from the robotic equipment, disposable components used during surgery, and sometimes longer operating room time.
Since insurers pay the same bundled rate regardless of technique, hospitals absorb most of this cost. Research published in Seminars in Plastic Surgery found that robotic procedures were consistently more costly by up to $5,500 compared to non-robotic versions, and that Medicare and Medicaid reimbursements can be low enough to create negative margins for hospitals on these cases. Hospitals with private-insurance-heavy patient populations tend to offset these losses because private insurers generally reimburse at higher rates than Medicare, even though the private insurers also don’t pay extra for the robot itself.
For you as the patient, the most likely scenario is that your out-of-pocket costs (deductible, copay, coinsurance) are based on the standard knee replacement rate your plan negotiated with the facility. You typically won’t see a separate line item for “robotic assistance” on your bill. However, some facilities charge higher facility fees overall, and if your surgeon operates at one of these centers, your percentage-based coinsurance could be higher simply because the total bill is higher.
Why Hospitals Offer It Anyway
If insurers don’t pay extra and hospitals lose money on the technology, you might wonder why robotic knee replacement is so widely available. The answer is competition. Hospitals invest in robotic systems to attract patients and surgeons, betting that the volume of cases will offset the per-procedure losses. The rapid spread of robotic surgical systems across the U.S. from 2005 to 2009 was driven largely by hospital competition, the presence of surgical specialists, and patient demand, particularly at larger hospitals with enough market power to sustain the investment.
How to Check Your Specific Coverage
Your actual costs depend on your plan type, your deductible status, and the facility where surgery takes place. A few practical steps can prevent surprises:
- Call your insurer’s pre-authorization line. Ask specifically whether the facility’s charges for robotic-assisted knee replacement will be processed at the same rate as a conventional knee replacement. Get the answer in writing if possible.
- Ask the surgeon’s billing office. Find out whether any portion of the robotic cost will be billed to you separately or whether it’s fully absorbed by the facility.
- Compare facility costs. If you have a choice of surgical centers, request cost estimates from each. A hospital that invested heavily in robotics may have higher overall facility fees than one that hasn’t, and your coinsurance percentage applies to that larger number.
- Confirm network status. Robotic systems are concentrated at larger medical centers. If your preferred robotic surgeon operates at an out-of-network facility, the cost difference will dwarf any robotic surcharge.
The bottom line: if your knee replacement is medically justified and your surgeon happens to use a robot, your insurance covers the surgery. You’re unlikely to face a separate charge specifically for the robotic component, but the overall facility bill at a robotics-equipped center can run higher, which may affect your coinsurance. The technology choice is between you and your surgeon, not something that requires a separate insurance approval.