Medicare covers weight loss surgery, but only under specific medical conditions and through approved procedures

Medicare Part B covers bariatric surgery when a doctor documents that you have a body mass index (BMI) of 35 or higher with an obesity-related health condition, or a BMI of 40 or higher regardless of other conditions. The surgery must be performed at a Medicare-approved facility, and your doctor must refer you to a surgeon who accepts Medicare. Coverage is not automatic — your surgeon's office will submit documentation to Medicare for review before the procedure.

The most common covered procedures are gastric bypass, gastric banding, and duodenal switch. Gastric sleeve surgery coverage varies by region and individual circumstances, so you will need to check with your specific Medicare plan. Medicare does not cover weight loss drugs, meal replacement programs, or gym memberships, even if recommended by your doctor.

Key Takeaways

  • Medicare Part B covers bariatric surgery when you have a BMI of 35 or higher with an obesity-related condition, or a BMI of 40 or higher on its own.
  • Your doctor must refer you to a Medicare-approved surgeon, and the surgeon's office submits your medical records to Medicare for review before scheduling.
  • Gastric bypass and gastric banding are covered in all regions, but gastric sleeve coverage depends on your location and individual health factors.
  • You will owe your Part B deductible and 20 percent coinsurance after Medicare pays its share of the approved amount.
  • Pre-surgery counseling, nutritional assessment, and psychological evaluation are covered as part of the pre-operative workup.

What conditions Medicare looks for before approving surgery

Medicare requires that your BMI fall into one of two categories. The first is a BMI of 35 or higher paired with at least one obesity-related condition — high blood pressure, type 2 diabetes, heart disease, sleep apnea, or osteoarthritis of weight-bearing joints. The second is a BMI of 40 or higher without any other condition required. Your surgeon will calculate your BMI from your height and weight at the time of evaluation.

You must also have tried medically supervised weight loss in the past — usually meaning a structured program with a doctor's oversight for at least six months. This does not mean you have to have lost weight; Medicare wants to see that you made a documented attempt. Your surgeon's office will gather this history as part of the pre-operative evaluation.

Medicare also requires that you have no medical conditions that would make surgery too risky. Your surgeon will order blood work, heart tests, and sometimes a sleep study to rule out serious complications. If you have untreated sleep apnea or severe heart disease, surgery may be delayed until those conditions are managed.

How the approval process works

Once your surgeon determines you meet the medical criteria, their office submits a request to Medicare with your medical records, BMI documentation, weight loss history, and test results. This packet goes to a Medicare contractor — a company that reviews claims for your region. The review typically takes one to two weeks, though it can take longer if Medicare requests additional information.

Medicare may approve the surgery, deny it, or ask for more details. If denied, your surgeon can appeal with additional documentation. Many denials are overturned on appeal, especially if your surgeon provides a detailed letter explaining why the surgery is medically necessary for your specific situation. Your surgeon's office should tell you whether they plan to appeal and what additional information they need from you.

Do not schedule surgery until you have written approval from Medicare. If you proceed without approval, you will be responsible for the full cost, which typically ranges from $15,000 to $35,000 depending on the procedure and facility.

What you will pay out of pocket

Once Medicare approves the surgery, you will owe your Part B deductible if you have not met it for the year. In 2024, the Part B deductible is $240, though this amount changes annually. After you meet the deductible, you pay 20 percent of the Medicare-approved amount for the surgery itself, the surgeon's fee, anesthesia, and facility costs.

The remaining costs depend on your specific plan. If you have a Medigap policy, it may cover some or all of your 20 percent coinsurance. If you have a Medicare Advantage plan, your out-of-pocket costs are capped at an annual maximum, and you may have different cost-sharing rules — some Advantage plans charge a copay instead of coinsurance. Check your plan documents or call your plan's customer service line to find out your exact costs before surgery.

Pre-operative visits, lab work, imaging, and psychological evaluation are covered as preventive or diagnostic services and typically require only your copay or coinsurance. Post-operative follow-up visits with your surgeon are also covered. Nutritional counseling after surgery may be covered if ordered by your surgeon, though some plans limit the number of visits.

Which surgeries Medicare covers in your region

Gastric bypass and gastric banding are covered nationwide. Gastric bypass is the most common covered procedure and involves creating a small pouch from the stomach and connecting the small intestine directly to it, bypassing part of the digestive tract. Gastric banding involves placing an adjustable band around the upper stomach to create a smaller pouch.

Duodenal switch is also covered but is less commonly performed. It combines elements of gastric sleeve and bypass surgery. Gastric sleeve surgery — in which part of the stomach is removed — has variable coverage. Some Medicare contractors cover it, while others do not. Your surgeon will know the coverage rules for your region and can tell you whether it is an option for you.

Newer procedures like intragastric balloons or endoscopic sleeve gastroplasty are not covered by Medicare. If your surgeon recommends one of these, you would pay the full cost out of pocket.

What happens if Medicare denies your request

If Medicare denies coverage, you have the right to appeal. Your surgeon's office can file an appeal on your behalf, usually at no cost to you. The appeal process has multiple levels: reconsideration by the same Medicare contractor, then review by an independent contractor if you disagree with the reconsideration decision.

Many denials are based on incomplete documentation — for example, if your weight loss history is not well documented or if recent lab work is missing. Your surgeon can resubmit with more complete records. If the denial is based on medical judgment — for instance, Medicare believes you are too high-risk for surgery — your surgeon can provide a detailed letter explaining why the benefits of surgery outweigh the risks in your case.

The appeal process can take several months. During this time, you can continue working with your surgeon on pre-operative preparation. If the appeal is ultimately denied, you can choose to pay for surgery out of pocket or explore other weight loss options with your doctor.

Medicare Advantage plans and weight loss surgery coverage

Medicare Advantage plans must cover bariatric surgery at the same medical criteria as Original Medicare, but they may have additional requirements. Some Advantage plans require prior authorization before you see a surgeon, while others require you to use surgeons within their network. A few plans have stricter BMI requirements or require longer documented weight loss attempts.

Call your Advantage plan's customer service number — on the back of your card — and ask specifically about bariatric surgery coverage. Ask whether you need prior authorization, which surgeons are in-network, what your out-of-pocket costs will be, and whether the plan covers the specific procedure your doctor recommends. Get the answers in writing if possible, so you have documentation if there is a dispute later.

If your Advantage plan denies coverage that Original Medicare would approve, you can appeal through the plan's appeals process or file a complaint with Medicare. You also have the right to switch to Original Medicare during the annual enrollment period if you believe your Advantage plan is unfairly restricting access to a medically necessary procedure.

Frequently Asked Questions

Do I need to try weight loss medication before Medicare will cover surgery?

Medicare does not require you to have tried weight loss drugs. You must have tried medically supervised weight loss — usually a structured program with a doctor's oversight for at least six months — but medication is not specifically required. If you have tried GLP-1 drugs like semaglutide, that counts as part of your weight loss history.

What if I have had weight loss surgery before and want another procedure?

Medicare can cover revision surgery if you meet the medical criteria and your surgeon documents that the revision is medically necessary. This might happen if your first surgery did not produce enough weight loss or if you regained significant weight. The approval process is the same as for first-time surgery.

Does Medicare cover surgery if I am over age 65?

Age alone does not disqualify you. Medicare covers bariatric surgery for people of any age on Medicare, as long as you meet the BMI and health condition criteria and your surgeon determines you are healthy enough for surgery. Older adults may need additional testing — such as a cardiac stress test or sleep study — to may support surgery is safe.

Will my Medigap plan cover the 20 percent coinsurance?

Most Medigap plans cover some or all of your Part B coinsurance, but it depends on which plan you have. Plans C, D, F, G, M, and N cover the full 20 percent coinsurance for bariatric surgery. Plans A, B, K, and L cover a percentage. Check your Medigap policy documents or call your insurance company to confirm your coverage.

Can I have weight loss surgery at a hospital outside my state?

Yes, as long as the facility is Medicare-approved and your surgeon accepts Medicare. Your surgeon's office will handle the Medicare approval process regardless of location. However, check whether your Medigap or Advantage plan covers out-of-state surgery, as some plans have network restrictions or require prior authorization for out-of-state procedures.