Medicare covers weight loss surgery in limited cases, but only if you meet strict medical requirements

Medicare Part B covers bariatric surgery — the medical term for weight loss surgery — but not for everyone who wants it. You must 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. You also need documentation that you have tried and failed at medical weight loss (diet, exercise, and sometimes medication) for at least six months before surgery. Medicare will not pay if you have not tried these approaches first.

The surgery itself must be performed at a Medicare-approved facility, and your doctor must refer you to a bariatric surgery center that has been certified by the American College of Surgeons or the American Society of Bariatric Surgeons. Not all hospitals meet this standard, so you will need to check whether your surgeon's facility is approved before scheduling.

Coverage varies slightly depending on which specific surgery you have. Medicare covers gastric bypass, gastric banding, and duodenal switch procedures. Gastric sleeve surgery coverage depends on your individual case and the specific Medicare Advantage plan you have, if you are enrolled in one.

Key Takeaways

  • Medicare Part B covers weight loss surgery only if your BMI is 35 or higher with an obesity-related condition, or 40 or higher without one.
  • You must show documentation of at least six months of attempted weight loss through diet, exercise, and sometimes medication before surgery.
  • Your surgery must take place at a Medicare-approved bariatric center certified by the American College of Surgeons or American Society of Bariatric Surgeons.
  • Gastric bypass, gastric banding, and duodenal switch are covered; gastric sleeve coverage varies by plan and individual circumstances.
  • You will typically pay 20 percent of the approved amount after you meet your Part B deductible, unless you have supplemental coverage.

What counts as a may have access to obesity-related health condition

Medicare recognizes specific medical conditions that make weight loss surgery medically necessary. These include type 2 diabetes, high blood pressure, heart disease, sleep apnea, and osteoarthritis of weight-bearing joints. You do not need all of these — one documented condition is enough if your BMI is 35 or higher.

Your doctor must document the condition in your medical record and explain how your weight is making it worse. For example, if you have sleep apnea, your doctor should note that your weight is contributing to the severity of your breathing problems. This documentation becomes part of your Medicare review.

If your BMI is 40 or higher, you do not need to have any of these conditions. Medicare considers a BMI of 40 or higher a medical reason for surgery on its own.

The six-month medical weight loss requirement

Before Medicare will pay for surgery, you must show that you have tried to lose weight through non-surgical methods for at least six months. This means your medical record should include visits with your doctor where you discussed diet changes, exercise plans, and sometimes weight loss medications like phentermine or GLP-1 drugs (such as semaglutide).

The six months does not have to be continuous, but it should show a genuine attempt. Your doctor should document the plan you followed, how often you checked in, and why surgery became necessary. If you have been working with a nutritionist or weight loss program, bring those records too — they strengthen your case.

Some Medicare Advantage plans require a supervised weight loss program as part of this six-month period. Ask your plan whether it has this requirement before you start, because the specific program may need to be one your plan recognizes.

What you will pay out of pocket

If Medicare approves your surgery, you pay 20 percent of the Medicare-approved amount after you meet your Part B deductible for the year. The deductible is currently $226 per year, though this amount changes annually. Your actual out-of-pocket cost depends on what the approved amount is for your specific surgery and facility.

Bariatric surgery is expensive — the approved amount is often $15,000 to $35,000 depending on the type of surgery and your location. That means your 20 percent share could range from $3,000 to $7,000 or more. If you have a Medigap supplemental policy, it may cover some or all of this 20 percent.

If you are in a Medicare Advantage plan instead of Original Medicare, your out-of-pocket costs work differently. Some plans cover bariatric surgery with a copay or coinsurance; others do not cover it at all. Call your plan directly to ask what your specific costs would be before you pursue surgery.

How to start the Medicare approval process

Begin by talking to your primary care doctor about weight loss surgery. Your doctor needs to confirm that you meet the BMI and health condition requirements, and that you have genuinely tried medical weight loss for six months. If your doctor thinks you are a candidate, ask for a referral to a bariatric surgery center that is Medicare-approved.

Once you have a referral, the bariatric center will review your medical records and may require additional testing — blood work, sleep studies, or psychological evaluation — to make sure surgery is safe for you. The center's staff will also submit your case to Medicare for pre-approval before scheduling surgery.

This pre-approval process typically takes two to four weeks. Medicare will review your BMI, your health conditions, your weight loss attempts, and your medical history. The bariatric center handles most of this paperwork, but ask them to keep you informed of the timeline.

What happens if Medicare denies your request

If Medicare denies your request for surgery, you have the right to appeal. The bariatric center can help you file an appeal, and you can also request a reconsideration on your own. An appeal gives Medicare a chance to review your case again, and you can submit additional medical records or documentation that might change the decision.

If you do not meet Medicare's requirements but still want surgery, you can pay for it yourself or look into whether your state Medicaid program covers bariatric surgery (coverage varies widely by state). Some private insurance plans also cover weight loss surgery with different requirements than Medicare.

Ask your bariatric center whether they offer payment plans or financing options if you decide to proceed without Medicare coverage. Many centers work with medical financing companies that allow you to pay over time.

Medicare Advantage plans and weight loss surgery

If you are enrolled in a Medicare Advantage plan, coverage for bariatric surgery may be different from Original Medicare. Some Advantage plans follow Medicare's rules exactly; others have stricter requirements or do not cover the surgery at all. A few plans cover bariatric surgery more broadly than Original Medicare does.

Call your Medicare Advantage plan and ask specifically whether bariatric surgery is covered, what the BMI and health condition requirements are, and what your out-of-pocket cost would be. Get the answer in writing if possible, because coverage details can change year to year.

If your current plan does not cover bariatric surgery and you want it, you may be able to switch to a different Medicare Advantage plan during the annual enrollment period (October 15 to December 7 each year) or to Original Medicare. However, you cannot switch plans specifically to get bariatric surgery if you are already enrolled — you have to wait for the enrollment period.

Frequently Asked Questions

Does Medicare cover the cost of follow-up appointments after weight loss surgery?

Yes. Medicare Part B covers office visits with your surgeon and other doctors who monitor your recovery and nutrition after surgery. You pay 20 percent of the approved amount for each visit after you meet your deductible. If you need nutritionist visits, ask your doctor whether Medicare will cover those — coverage for nutritional counseling depends on your specific diagnosis and whether your doctor orders it as medically necessary.

What if I have a BMI of 32 but serious health problems from my weight?

Medicare's BMI thresholds are firm. A BMI below 35 with a health condition, or below 40 without one, does not meet the requirement, even if your health problems are severe. Your only option through Medicare is to continue with medical weight loss attempts and reapply if your BMI reaches 35. Some private insurance plans have lower BMI thresholds, so check whether you have coverage outside of Medicare.

Can I have weight loss surgery at any hospital, or does it have to be a special center?

Medicare will only pay if the surgery happens at a bariatric center certified by the American College of Surgeons or the American Society of Bariatric Surgeons. Not all hospitals have this certification. Your surgeon's office can tell you whether their facility is certified, or you can search the American College of Surgeons website for certified centers in your area.

Do I need a psychological evaluation before Medicare will pay?

Medicare does not require a psychological evaluation as a condition of coverage, but most bariatric centers perform one anyway as part of their standard pre-surgery screening. This evaluation helps make sure you understand what the surgery involves and are prepared for the lifestyle changes required afterward. Ask your bariatric center what their evaluation process includes.

If I lose weight on my own without surgery, will Medicare reimburse my diet program or gym membership?

No. Medicare does not cover weight loss programs, gym memberships, or diet programs as a way to prevent or treat obesity. Medicare covers the six-month medical weight loss attempts you document with your doctor — office visits, medications, and sometimes nutritionist visits if your doctor orders them — but not commercial weight loss programs or fitness services.