Medicare covers bariatric surgery, but only if you meet specific medical requirements and follow the approval process your plan requires.

Medicare Part B covers weight loss 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 medically necessary — meaning your doctor has tried other weight loss methods first and they have not worked. Medicare does not cover the surgery for cosmetic reasons or if you straightforward want to lose weight.

The approval process takes time. Your doctor submits documentation to Medicare showing your BMI, your weight loss history, and any weight-related health problems like diabetes or sleep apnea. Medicare reviews this information and makes a coverage decision. This is not something you can rush, and it is not automatic even if you meet the BMI numbers.

Key Takeaways

  • Medicare Part B covers bariatric surgery when your BMI is 35 or higher with an obesity-related condition, or 40 or higher on its own.
  • Your doctor must document that you have tried other weight loss methods and that surgery is medically necessary for your health.
  • The approval process requires your doctor to submit medical records and documentation; you cannot start the process yourself.
  • Medicare Advantage plans (Part C) may have different coverage rules, so you need to check your specific plan's policy.
  • You will owe a Part B deductible and coinsurance, typically 20 percent of the approved surgery cost after the deductible.

What Medicare Part B Actually Covers

Medicare Part B pays for the bariatric surgery procedure itself — the surgeon's fee, the operating room, anesthesia, and the hospital stay. It also covers pre-surgery consultations and testing, such as the psychological evaluation your surgeon requires and any imaging or lab work done before the operation.

Post-surgery follow-up visits with your surgeon are covered. However, Medicare does not cover nutritional counseling or weight loss programs before or after surgery unless they are part of your surgeon's required protocol and documented as medically necessary. Vitamin supplements you need after surgery are not covered by Medicare Part B; you pay for those out of pocket.

The specific procedures covered include gastric bypass, gastric banding, duodenal switch, and sleeve gastrectomy. Your surgeon and your doctor will determine which procedure is appropriate for your situation.

The Medical Requirements Medicare Uses

Medicare requires that you have tried to lose weight through other methods — diet, exercise, and sometimes medication — before surgery is considered. Your doctor documents these attempts in your medical record. This does not mean you have to spend years trying; it means your doctor has to show that you have made a genuine effort and that it has not been successful.

You must also have at least one weight-related health condition if your BMI is between 35 and 39.9. These conditions include type 2 diabetes, high blood pressure, heart disease, sleep apnea, or osteoarthritis. If your BMI is 40 or higher, you do not need another condition — the BMI alone qualifies you medically.

Your doctor must believe the surgery will improve your health or help manage your weight-related conditions. This is a medical judgment call, and different doctors may reach different conclusions about the same patient. Your surgeon will be the one making this information based on your individual situation.

How the Approval Process Works

Start by talking to your primary care doctor or a weight loss specialist about bariatric surgery. If your doctor thinks it may help, they will refer you to a bariatric surgeon. The surgeon's office handles most of the paperwork and submits the documentation to Medicare on your behalf.

Your surgeon will order any testing Medicare requires — usually blood work, imaging, and a psychological evaluation to make sure you understand what surgery involves and are ready for the lifestyle changes. These tests become part of your medical record that goes to Medicare.

Once your surgeon's office has all the documentation, they submit it to Medicare for review. This step is called a prior authorization request. Medicare reviews the medical records and decides whether the surgery meets its coverage rules. The review typically takes two to four weeks, though it can take longer if Medicare asks for more information.

If Medicare approves the surgery, your surgeon's office will tell you and you can schedule the procedure. If Medicare denies it, your surgeon's office will explain why and discuss whether you can appeal or whether different documentation might change the decision.

What You Pay Out of Pocket

You are responsible for your Part B deductible before Medicare starts paying. For 2024, the Part B deductible is $240, though this amount changes each year. Once you have met the deductible, Medicare pays 80 percent of the approved surgery cost and you pay 20 percent coinsurance.

The total cost of bariatric surgery varies widely depending on the type of procedure, your location, and the hospital or surgical center. Costs typically range from $15,000 to $35,000 before insurance, but your actual out-of-pocket cost depends on what Medicare approves as the reasonable charge in your area. Your surgeon's office can give you an estimate of what you will owe after Medicare pays its share.

If you have a Medigap supplemental insurance plan, it may cover some or all of your coinsurance. Check your Medigap policy or call your supplemental insurance company to find out what bariatric surgery coverage you have.

Medicare Advantage Plans and Bariatric Surgery

If you have a Medicare Advantage plan (Part C), your coverage for bariatric surgery may be different from Original Medicare. Some Advantage plans cover it under the same rules as Medicare Part B. Others have stricter requirements, higher out-of-pocket costs, or may not cover it at all.

You need to contact your specific Advantage plan and ask about bariatric surgery coverage before you start the process with a surgeon. Your plan's member services number is on your insurance card. Ask them directly: "Does my plan cover bariatric surgery, and what are the requirements?" Get the answer in writing if possible, because coverage policies can change.

Some Advantage plans require you to use surgeons in their network. If your preferred surgeon is not in-network, your plan may not cover the surgery, or you may have to pay more out of pocket. Check your plan's provider directory or call member services to see which bariatric surgeons are in your network.

What Happens If Medicare Denies Your Request

If Medicare denies coverage, your surgeon's office will send you a notice explaining the reason. Common reasons for denial include: your BMI does not meet the threshold, you do not have a weight-related health condition (if your BMI is below 40), or your medical records do not show you have tried other weight loss methods first.

You have the right to appeal Medicare's decision. Your surgeon's office can help you gather additional medical evidence and submit an appeal. An appeal can take several months, and there is no may provide it will succeed, but it is worth pursuing if you believe Medicare made an error or if your health situation has changed since the initial request.

If you cannot get Medicare to cover the surgery, some bariatric surgery centers offer payment plans or reduced rates for uninsured or out-of-pocket patients. This is something to discuss with your surgeon if you decide to move forward without Medicare coverage.

Frequently Asked Questions

Do I have to be a certain age to get bariatric surgery covered by Medicare?

No, there is no age limit. Medicare covers bariatric surgery for anyone 65 and older who meets the medical requirements. Younger people on Medicare due to disability or end-stage renal disease are also covered under the same rules.

Can I get bariatric surgery if I have never tried weight loss medication?

Your doctor has to document that you have tried other methods, but that does not necessarily mean medication. Diet and exercise attempts count. However, if your doctor thinks medication would be appropriate for your situation, they may recommend trying it first before surgery is considered.

How long after Medicare approves the surgery can I have it done?

Once Medicare approves it, you can schedule the surgery whenever your surgeon has an opening. There is no time limit on how long you have to use the approval, but if your health situation changes significantly, Medicare may require a new authorization.

Will Medicare cover a second bariatric surgery if the first one does not work?

Medicare may cover revision surgery if there is a medical reason — for example, if the first surgery failed or caused complications. Your surgeon would need to submit new documentation showing why a second surgery is medically necessary. Coverage is not automatic.

What if my surgeon is out of network for my Medicare Advantage plan?

Out-of-network surgeons are usually not covered by Advantage plans, or you pay significantly more out of pocket. Contact your plan to ask whether they will make an exception or whether they can refer you to an in-network bariatric surgeon in your area.