Medicare covers bariatric surgery, but only if you meet strict medical requirements and your doctor documents that you have tried and failed at weight loss through diet and exercise first.

Medicare Part B pays for bariatric surgery when a doctor determines it is medically necessary. The surgery must be performed at a Medicare-approved facility. You will pay 20 percent of the approved amount after you meet your Part B deductible, and the facility bills Medicare for the rest.

The catch is that Medicare has specific rules about who qualifies. You cannot straightforward ask for the surgery and receive it. Your doctor must submit documentation showing your weight-related health problems, your body mass index (BMI), and proof that you tried weight loss programs without success. Medicare reviews this before approving payment.

Key Takeaways

  • Medicare covers bariatric surgery only when a doctor documents that you have a BMI of 35 or higher with weight-related health problems, or a BMI of 40 or higher regardless of other conditions.
  • You must show that you tried a supervised weight loss program for at least three months before the surgery date, and your doctor must submit this proof to Medicare.
  • The surgery must take place at a Medicare-approved facility, and your doctor must get Medicare approval before scheduling.
  • You pay 20 percent of the approved cost after meeting your Part B deductible; the exact amount depends on the type of surgery and your location.
  • Medicare covers follow-up visits and complications related to the surgery, but not cosmetic procedures to remove excess skin afterward.

BMI and Health Condition Requirements

Medicare requires one of two situations. Either your BMI is 35 or higher and you have at least one weight-related health problem (such as diabetes, heart disease, sleep apnea, or high blood pressure), or your BMI is 40 or higher with no other conditions required.

Your doctor calculates your BMI using your height and weight. A BMI of 35 means you are roughly 60 pounds overweight if you are 5 feet 5 inches tall, though the exact number varies by height. If you are unsure of your BMI, your doctor's office can calculate it during a visit.

The weight-related health problems must be documented in your medical records. If you have diabetes or sleep apnea, your doctor should have notes from tests or visits confirming this. Medicare will ask to see these records as part of the review.

The Supervised Weight Loss Program Requirement

Before Medicare will pay for surgery, you must complete a supervised weight loss program for at least three months. This is not a diet you do on your own at home. It must be a formal program where a doctor, registered dietitian, or other may have access to professional monitors your progress.

The program can take place at a hospital, clinic, or doctor's office. Your doctor refers you to the program, and staff track your weight, diet, and exercise. At the end of three months, the program provides a letter stating that you participated and what happened to your weight.

Medicare wants to see that you made a genuine effort. If you lost weight during the program, that is good — it shows you can change your habits. If you did not lose weight or gained weight, that also counts, because it shows the program was tried and did not work without surgery. What Medicare will not accept is skipping the program entirely or doing a program on your own without professional supervision.

How to Start the Medicare Approval Process

Your first step is to talk to your primary care doctor or a weight loss specialist. Tell them you are interested in bariatric surgery and ask whether you might meet Medicare's requirements. Your doctor will review your medical history, measure your BMI, and discuss your weight-related health problems.

If your doctor thinks you are a candidate, they will refer you to a bariatric surgery center. Many hospitals have bariatric surgery programs. The center will schedule an appointment with a surgeon who specializes in weight loss surgery.

At that appointment, the surgeon's office will review your medical records and determine whether you need the supervised weight loss program first. If you have not done one, they will refer you to a program in your area. If you have already completed one, they will collect that documentation.

Once you have finished the weight loss program (or if you already completed one), the surgeon's office submits a request to Medicare for approval. This request includes your BMI, your health conditions, the weight loss program records, and the surgeon's recommendation. Medicare reviews the request, which typically takes one to two weeks.

Types of Bariatric Surgery Medicare Covers

Medicare covers four main types of weight loss surgery: gastric bypass, gastric banding, gastric sleeve, and duodenal switch. Each works differently, and your surgeon will recommend the one most likely to help you based on your health and weight loss goals.

Gastric bypass is the most common. The surgeon creates a small pouch from the top of your stomach and connects it directly to your small intestine, bypassing most of your stomach. This limits how much you can eat and reduces how many calories your body absorbs.

Gastric sleeve removes about 80 percent of your stomach, leaving a tube-shaped pouch. You feel full faster and eat less, but your stomach still works normally otherwise.

Gastric banding places an adjustable band around the upper part of your stomach, creating a small pouch. The band can be tightened or loosened over time. This surgery is less common now because it has higher complication rates than the other options.

Duodenal switch is the most complex. The surgeon removes part of your stomach and reroutes your small intestine so that food bypasses most of it. This limits both how much you eat and how many calories you absorb, but it carries higher risks of nutritional problems.

What You Will Pay Out of Pocket

You pay 20 percent of Medicare's approved amount for the surgery after you meet your Part B deductible. The approved amount varies by location and the type of surgery, but bariatric surgery typically costs between $15,000 and $35,000 before insurance. Your 20 percent share could range from $3,000 to $7,000, depending on where you live and which surgery you have.

If you have a Medigap policy (supplemental insurance), it may cover some or all of your 20 percent cost. Check your policy documents or call your Medigap insurer to ask what they cover for bariatric surgery.

If you have a Medicare Advantage plan instead of Original Medicare, your out-of-pocket costs may be different. Some Advantage plans cover bariatric surgery, and some do not. Call your plan to ask whether they cover it and what your cost would be.

Medicare covers follow-up visits with your surgeon and treatment of any complications from the surgery. It does not cover cosmetic surgery to remove excess skin after you lose weight, even though many people need this procedure.

Common Reasons Medicare Denies Bariatric Surgery

Medicare denies requests when the BMI is below 35 without documented health conditions, or below 40 with no conditions. If your BMI is 34, you do not meet the threshold, and Medicare will not pay no matter how many health problems you have.

Denial also happens when you have not completed a supervised weight loss program or when the program documentation is incomplete. If the program letter does not clearly state the dates you attended or your weight at the start and end, Medicare may ask for more information before deciding.

Some denials occur because the surgery center is not Medicare-approved. Always confirm that your surgeon's facility accepts Medicare and is approved to perform bariatric surgery before scheduling.

If Medicare denies your request, your surgeon's office can appeal. The appeal includes additional medical records, a letter from your doctor explaining why surgery is necessary, and any new information that addresses Medicare's reason for the denial. Appeals can take several weeks.

Frequently Asked Questions

What if I have a BMI of 30 to 34 but serious health problems from my weight?

Medicare will not cover the surgery at that BMI, even with health problems. The BMI threshold is firm. If your BMI is below 35, you do not meet Medicare's medical necessity standard, and the agency will deny the request. Some private insurance plans have lower BMI thresholds, so you could ask your doctor whether you have other coverage options.

Can I do the weight loss program and surgery in different calendar years?

Yes. You can complete the supervised weight loss program in one year and have the surgery the next year. Medicare does not require them to happen in the same year. However, the program must be completed within a certain time before surgery — typically within one to two years, depending on your surgeon's requirements.

Does Medicare cover the surgery if I have already had weight loss surgery before?

Medicare may cover revision surgery if the first surgery failed or caused complications. You would need to meet the same BMI and health condition requirements, and your doctor would need to document why the previous surgery did not work. Each case is reviewed individually.

What happens if I regain weight after the surgery?

Medicare covers the surgery itself and follow-up care, but it does not cover a second surgery if you regain weight later. After surgery, you will need to follow dietary guidelines and exercise regularly to maintain weight loss. Your surgeon will provide instructions on eating and activity.

Will my Medicare Advantage plan cover bariatric surgery the same way Original Medicare does?

No. Medicare Advantage plans set their own rules for bariatric surgery coverage. Some cover it with the same requirements as Original Medicare, some have stricter rules, and some do not cover it at all. Call your Advantage plan directly to ask what they cover and what your costs would be.