Medicare covers weight loss surgery, but only under specific medical conditions and after you complete a supervised diet program first

Medicare Part B will pay for bariatric surgery — the medical term for weight loss surgery — if your doctor documents that you have obesity-related health problems and have tried medically supervised weight loss without success. The surgery must be performed at a Medicare-approved facility by a surgeon enrolled in Medicare. Medicare does not cover the surgery for weight loss alone; there must be a documented medical reason, such as diabetes, heart disease, or severe joint problems caused by your weight.

The most common surgeries Medicare covers are gastric bypass, gastric banding, and duodenal switch. Lap-band surgery (a type of gastric banding) has stricter requirements than bypass surgery and is approved less often. Medicare will not cover purely cosmetic weight loss procedures or experimental surgeries not yet approved by the Food and Drug Administration.

Key Takeaways

  • Medicare requires you to have a body mass index (BMI) of 35 or higher with an obesity-related condition, or a BMI of 40 or higher regardless of other conditions, to be considered for coverage.
  • You must complete a supervised diet program for at least three to six months before surgery and document your weight loss attempts with your doctor.
  • Your surgeon must be enrolled in Medicare and the facility must be Medicare-approved; you should confirm this before scheduling any procedure.
  • Medicare covers the surgery itself and related hospital costs, but you pay your Part B deductible and coinsurance, which typically runs 20 percent of the approved amount.
  • Complications and follow-up care after surgery are covered by Medicare if they occur within the same hospital stay or are billed as related to the original surgery.

The medical conditions Medicare requires before approving surgery

Medicare will not approve weight loss surgery based on weight alone. Your doctor must document that you have a medical condition directly caused or worsened by your weight. The most commonly approved conditions are type 2 diabetes, high blood pressure, heart disease, sleep apnea, and severe arthritis of the knees or hips. Your doctor's notes must show that your weight is the primary driver of the condition and that losing weight would likely improve it.

You must also meet a body mass index (BMI) threshold. If you have an obesity-related condition like diabetes, your BMI must be 35 or higher. If you do not have a documented obesity-related condition, your BMI must be 40 or higher. Your doctor calculates BMI from your height and weight; you cannot meet this requirement through self-measurement. The measurement must appear in your medical record within the six months before your surgery request.

Medicare reviews each case individually. Having the right BMI and a may have access to condition does not automatically mean approval — your doctor must also show that you are medically fit for surgery and that the benefits outweigh the risks for you specifically.

The supervised diet program you must complete first

Before Medicare will consider surgery, you must complete a medically supervised weight loss program. This is not a commercial diet program or an online weight loss app. It must be supervised by a physician, registered dietitian, or other may have access to healthcare provider, and it must be documented in your medical records with dates and progress notes.

The program typically lasts three to six months, though Medicare does not set a fixed length — your doctor and the weight loss program determine how long is appropriate for you. During this time, you attend regular visits where your weight, diet, and progress are recorded. You do not have to lose a specific amount of weight to move forward; the goal is to show that you have made a serious, documented attempt at weight loss under medical supervision and that surgery is the next reasonable step.

If you have already completed a supervised diet program in the past, your doctor may be able to use those records instead of requiring you to start over. Bring any documentation of previous weight loss attempts to your first appointment with the bariatric surgeon.

How to find a Medicare-approved surgeon and facility

Not every surgeon who performs weight loss surgery is enrolled in Medicare, and not every hospital is approved to perform these procedures under Medicare coverage. Before you schedule surgery, confirm that both your surgeon and the facility are Medicare-approved.

Call Medicare at 1-800-MEDICARE and ask whether a specific surgeon and hospital are enrolled. You can also visit the Medicare Physician Compare tool at compare.cms.gov and search by the surgeon's name and location. The hospital should also be able to tell you whether it is a Medicare-approved facility for bariatric surgery; ask directly when you call to schedule a consultation.

If your preferred surgeon is not enrolled in Medicare, you have two options: ask whether they will enroll (some surgeons do this for individual patients), or find a different surgeon who is already enrolled. Choosing an unenrolled surgeon means Medicare will not cover the procedure, and you will pay the full cost out of pocket.

What Medicare pays and what you pay out of pocket

Medicare Part B covers 80 percent of the approved amount for bariatric surgery after you meet your annual deductible. You are responsible for the remaining 20 percent, called coinsurance. The total out-of-pocket cost depends on the approved amount for the procedure in your area, which varies by region and facility.

The approved amount typically ranges from $15,000 to $35,000 for the surgery itself, though this varies widely. Your 20 percent coinsurance could range from $3,000 to $7,000 or more. Hospital costs, anesthesia, and facility fees are included in this approved amount. If you have a Medigap or Medicare Advantage plan, your supplemental coverage may pay some or all of your coinsurance; check your plan documents or call your plan to confirm.

Costs for the required supervised diet program before surgery are usually covered by Medicare Part B as preventive care or as part of your doctor's office visit, but confirm this with your doctor's office before you enroll. Some weight loss programs charge a separate fee that Medicare may not cover.

What happens after surgery and what Medicare covers next

Complications that occur during your hospital stay for surgery are covered by Medicare as part of the original procedure. If you develop an infection, bleeding, or other problem while you are still in the hospital, Medicare pays for the treatment under the same claim.

Follow-up care after you leave the hospital — such as office visits with your surgeon, blood tests, or imaging — is covered by Medicare Part B as long as it is medically necessary and related to your weight loss surgery. You pay your Part B coinsurance (20 percent) for each visit or test. Nutritional counseling after surgery is often covered as well, though your doctor must order it as part of your post-surgery care plan.

If you need a second surgery to revise or repair the first one, Medicare will cover it if your surgeon documents that the revision is medically necessary. Revisions are common — some patients need adjustments to their gastric band, or conversion from one type of surgery to another — and Medicare treats these as related to the original procedure.

Common reasons Medicare denies weight loss surgery requests

The most frequent reason for denial is insufficient documentation of a supervised diet program. If your doctor's records do not show regular visits and progress notes from a medically supervised weight loss program, Medicare will ask for more information or deny the request. Start your supervised diet program early and keep all documentation from your visits.

A second common reason is that your BMI does not meet the threshold, or your doctor has not documented an obesity-related medical condition. If you are close to the BMI requirement, ask your doctor whether any existing health problems (even ones you did not think were weight-related) may have access to as obesity-related conditions under Medicare's rules.

Medicare may also deny the request if your surgeon or facility is not enrolled in Medicare. Always verify enrollment before you invest time in the approval process. If you have already been denied, ask your doctor to request a detailed explanation from Medicare; sometimes the reason is fixable, such as missing documentation that can be resubmitted.

Frequently Asked Questions

Does Medicare cover weight loss surgery if I am over 65?

Yes, age alone does not disqualify you. Medicare covers bariatric surgery for people of any age enrolled in Part B, as long as you meet the BMI and medical condition requirements and complete the supervised diet program. Your doctor will assess whether surgery is safe for you given your overall health.

What if I have a Medicare Advantage plan instead of Original Medicare?

Medicare Advantage plans must cover bariatric surgery under the same rules as Original Medicare Part B, but they may have additional requirements, such as prior authorization or a requirement to use in-network surgeons. Contact your plan before you start the supervised diet program to understand their specific rules.

Can I appeal if Medicare denies my request for surgery?

Yes. Ask your doctor to request a detailed explanation of the denial from Medicare. If the reason is missing documentation, your doctor can resubmit with additional records. If you disagree with the denial, you have the right to file a formal appeal; your doctor's office can help you with this process.

Does Medicare cover the cost of the supervised diet program?

Medicare Part B typically covers office visits with your doctor or registered dietitian as part of preventive care, but some weight loss programs charge separate fees that Medicare may not cover. Ask your program and your doctor's office about costs before you enroll.

What if my surgeon wants me to have surgery at a facility that is not Medicare-approved?

Medicare will not cover the procedure at a non-approved facility. You would pay the full cost out of pocket. Ask your surgeon whether they can perform the surgery at a Medicare-approved hospital instead, or consider finding a different surgeon who operates at an approved facility.