Most health insurance plans, including Medicare and employer-sponsored coverage, do cover hip replacement surgery when it’s deemed medically necessary. The key word there is “medically necessary.” You won’t get automatic approval just because your hip hurts. Insurers require documented evidence that your joint disease is severe enough to warrant surgery and that you’ve already tried nonsurgical treatments without adequate relief.
What “Medically Necessary” Means for Hip Replacement
Insurance companies and Medicare use the same basic framework to decide whether a hip replacement qualifies for coverage. Your medical records need to show three things: imaging that confirms joint damage, pain that limits your daily life, and a history of trying conservative treatment first.
For imaging, an X-ray, MRI, or CT scan must show at least one sign of advanced joint disease. This includes narrowing of the joint space, bone-on-bone contact, bone cysts or hardening beneath the cartilage, bone spurs around the joint, or a condition called avascular necrosis where the bone tissue is dying from lack of blood supply. A doctor saying “the joint looks bad” isn’t enough. The imaging report needs to document specific findings.
For pain and disability, your records should show that hip problems are interfering with everyday activities like walking, climbing stairs, getting dressed, or sleeping. Insurers look for documentation that pain increases with weight-bearing or when you start moving, not just occasional discomfort.
For conservative treatment, most insurers expect at least three months of nonsurgical management before they’ll approve surgery. This typically includes a trial of anti-inflammatory medications (or documentation that you can’t take them), supervised physical therapy, flexibility and strengthening exercises, assistive devices like a cane, weight loss if appropriate, and sometimes cortisone injections into the hip joint. A simple note in your chart saying “failed conservative treatment” won’t cut it. Your records need to detail what was tried, for how long, and why it didn’t work.
How Medicare Covers Hip Replacement
Medicare covers hip replacement under both Part A (hospital services) and Part B (surgeon and outpatient services), provided the procedure meets medical necessity criteria. The documentation standards are strict. In the 2024 reporting period, medical necessity issues accounted for 92.8% of improper payment denials for major hip and knee replacements. Most of those denials weren’t because the patient didn’t need a new hip. They happened because the procedure was billed as an inpatient stay when it should have been classified as outpatient.
This distinction matters to your wallet. If your hip replacement is performed as an outpatient procedure (which is increasingly common for straightforward cases), you’ll pay the Part B coinsurance of 20% after your deductible. If you’re admitted as an inpatient, Part A covers the hospital stay with a separate deductible structure. Supplemental Medigap policies or Medicare Advantage plans can reduce your share further, but the specifics depend on your plan.
Private Insurance and Pre-Authorization
Most private insurers require pre-authorization before hip replacement surgery. This means your surgeon’s office submits your medical records for review, and the insurance company decides whether to approve the procedure before it happens. Getting pre-authorization isn’t just a formality. If you skip it and your plan requires it, you could be responsible for the entire cost.
The documentation your insurer will want to see mirrors what Medicare requires: imaging results with specific findings, records showing pain that limits daily activities, evidence of conservative treatment over several months, and notes from your surgeon explaining why surgery is the appropriate next step. Your surgeon’s office handles most of this, but it helps to make sure your primary care visits and physical therapy sessions have been well documented along the way. If your physical therapist noted that your range of motion didn’t improve after six weeks, or your doctor recorded that anti-inflammatory medications caused stomach problems, those details strengthen your case.
Pre-authorization timelines vary. Some insurers respond within a few days, others take weeks. If your request is denied, you have the right to appeal, and many denials are overturned when additional documentation is provided.
What Insurance Typically Won’t Cover
Robotic-assisted hip replacement is a common source of confusion. If your surgeon uses a robotic system during the procedure, the robotic component is generally considered part of the overall surgery and isn’t billed separately. However, some insurers, including Aetna, classify computer-assisted surgical navigation systems as experimental or unproven for total hip replacement, meaning they won’t reimburse that technology as a standalone charge. In practice, this usually doesn’t affect your coverage for the hip replacement itself. It means the hospital absorbs the cost of the robotic equipment rather than passing it to your insurer as an extra line item. Ask your surgeon’s billing office whether the facility charges extra for robotic assistance or includes it in the surgical fee.
Procedures that are considered cosmetic, experimental, or not supported by standard medical evidence are also excluded. A hip replacement for documented arthritis with functional limitations is standard care. A hip resurfacing procedure in a patient who doesn’t meet the clinical criteria would likely be denied.
Both Hips at the Same Time
If both of your hips need replacing, you might wonder whether insurance covers doing them simultaneously. Simultaneous bilateral hip replacement, where both hips are replaced in a single surgery, is a covered procedure when medically necessary, but insurers may scrutinize these cases more closely. The procedure carries higher surgical risk, so it’s typically reserved for younger patients (generally 60 and under) who are in good overall health and not taking daily medications for heart disease, high blood pressure, or other chronic conditions. If you don’t fit that profile, your surgeon will likely recommend staging the procedures several months apart, which insurance covers as two separate surgeries.
Your Out-of-Pocket Costs
Even with insurance coverage, hip replacement comes with significant out-of-pocket expenses. Your actual costs depend on your plan’s deductible, coinsurance rate, and out-of-pocket maximum. For most people with private insurance, the out-of-pocket maximum is the number that matters most. Once you hit that ceiling, your plan covers 100% of covered services for the rest of the year. Since hip replacement is a major procedure, many patients reach their out-of-pocket maximum with the surgery alone.
Costs you should ask about in advance include the surgeon’s fee, anesthesia, the hospital or surgical center facility fee, the cost of the implant itself, physical therapy after surgery, and any pre-surgical testing. Request an estimate from both your surgeon’s office and the facility where the surgery will be performed. If your plan has a preferred network of hospitals or surgeons, staying in-network can save thousands of dollars. Out-of-network providers often result in higher coinsurance rates and may not count toward your in-network out-of-pocket maximum.
Some plans also require you to use a designated center of excellence for joint replacement surgery to receive the highest level of coverage. Check your specific plan documents or call your insurer’s member services line before scheduling.