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 obesity-related health problems, or a BMI of 40 or higher regardless of other conditions. The surgery must be performed at a Medicare-approved facility by a surgeon enrolled in Medicare. Your doctor will need to refer you to a bariatric surgery center, where you'll undergo evaluation before any procedure is scheduled.

The amount Medicare pays depends on which type of surgery you have and where you have it done. Medicare covers the surgeon's fee, facility costs, and anesthesia as part of the procedure. You pay your Part B deductible (which changes yearly) and then 20% of the approved amount after that. If you have a Medigap or Medicare Advantage plan, your out-of-pocket costs may be lower.

Key Takeaways

  • Medicare Part B covers bariatric surgery when your BMI is 35 or higher with weight-related health problems, or 40 or higher without other conditions.
  • Your doctor must refer you to a Medicare-approved bariatric surgery center, where surgeons will evaluate whether surgery is medically necessary for you.
  • You pay your Part B deductible plus 20% of the approved surgical cost; Medigap or Medicare Advantage plans may cover some or all of this.
  • Medicare requires a supervised weight loss program before surgery, typically lasting three to six months, to show you can follow post-surgery diet changes.
  • Post-surgery follow-up visits, nutritional counseling, and lab work are covered by Medicare when ordered by your bariatric surgeon.

Medical requirements Medicare uses to decide coverage

Medicare will not pay for bariatric surgery based on appearance or personal preference. A doctor must document that you have a BMI of 35 or higher and at least one weight-related health problem—such as type 2 diabetes, high blood pressure, sleep apnea, or heart disease—or a BMI of 40 or higher with no other conditions required. Your primary care doctor or a specialist can make this information.

The bariatric surgery center will review your medical records to confirm these numbers. They will also check that you do not have conditions that make surgery too risky, such as untreated heart disease or severe liver disease. If you have had previous abdominal surgery, the center will note this because it can affect which type of bariatric procedure is possible.

Your age alone does not disqualify you. Medicare covers bariatric surgery for people in their 60s, 70s, and beyond if the medical criteria are met and your overall health is stable enough for surgery.

The supervised weight loss program requirement

Before Medicare will pay for bariatric surgery, you must complete a supervised weight loss program. This is not a diet you do at home. The program must be run by a doctor, registered dietitian, or other may have access to healthcare provider, and it typically lasts three to six months. During this time, you attend regular visits where a provider monitors your weight, teaches you about nutrition, and documents your progress.

The purpose of this requirement is to show that you can follow medical information about eating and that you understand the permanent dietary changes bariatric surgery requires. Some people lose weight during the program, which is helpful but not required for approval. What matters is that you attend the visits and demonstrate commitment to the process.

If you have already completed a supervised weight loss program in the past—even years ago—ask your bariatric surgery center whether that counts. Some centers will accept prior documentation if it is recent enough, which can shorten the waiting period before surgery.

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 bariatric surgeon will recommend which is safest and most effective for your situation based on your medical history, current weight, and other factors.

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

Gastric sleeve removes about 80% of your stomach, leaving a tube-shaped pouch. You feel full faster and eat less, but your intestines are not rerouted. Gastric banding places an adjustable band around the upper part of your stomach to create a small pouch. Duodenal switch combines elements of sleeve and bypass. All four are covered by Medicare when medical criteria are met.

What you pay out of pocket

Your costs depend on your Medicare plan. If you have Original Medicare (Part A and Part B), you pay your Part B deductible for the year, then 20% of the approved surgical cost. The deductible changes yearly; check your Medicare Summary Notice or call 1-800-MEDICARE to find out this year's amount.

The approved amount varies by location and facility. A bariatric surgery center can tell you the expected approved amount before your surgery, so you can calculate your 20% share. Some facilities offer payment plans if you need to spread the cost over several months.

If you have a Medigap policy, it typically covers your 20% coinsurance after you pay the deductible. If you have a Medicare Advantage plan, your out-of-pocket costs depend on your specific plan—some cover bariatric surgery with little or no cost-sharing, while others have higher deductibles or coinsurance. Call your plan to ask what you will owe before you schedule surgery.

Post-surgery care and follow-up visits

Medicare covers follow-up visits with your bariatric surgeon after surgery. These visits are critical because they monitor your healing, check for complications, and adjust your care as needed. You typically have visits at one week, one month, three months, six months, and one year after surgery, then annually afterward.

Nutritional counseling with a registered dietitian is covered when your bariatric surgeon orders it. After surgery, your body absorbs nutrients differently, and you will need to take vitamins and minerals for life. A dietitian teaches you which supplements to take, how much to eat at each meal, and which foods to avoid. These visits are usually covered as part of your post-operative care.

Lab work to check your vitamin levels, blood sugar, and other markers is covered when ordered by your surgeon. If you develop complications—such as infection, bleeding, or a leak at the surgical site—emergency care and any needed revision surgery are covered by Medicare.

How to start the process

Begin by talking with your primary care doctor about bariatric surgery. Tell them about your weight, any weight-related health problems you have, and your interest in surgery. Your doctor can refer you to a Medicare-approved bariatric surgery center in your area or help you find one.

Call the bariatric surgery center and ask whether they accept Medicare. Confirm that the surgeons there are enrolled in Medicare and that the facility is Medicare-approved. Ask what the center needs from you to start the evaluation—usually your medical records, a list of current medications, and recent lab work.

At your first appointment, the bariatric team will review your medical history, perform an exam, and order any tests they need. They will explain which type of surgery they recommend and what to expect before, during, and after. If you meet Medicare's criteria, they will enroll you in their supervised weight loss program or confirm that your prior program counts.

Frequently Asked Questions

Does Medicare Advantage cover bariatric surgery?

Most Medicare Advantage plans cover bariatric surgery if you meet the same medical criteria as Original Medicare. However, coverage details vary by plan—some may require prior authorization, have different deductibles, or limit which surgeons or facilities you can use. Call your plan before scheduling a consultation to understand your coverage and any restrictions.

What if I don't meet Medicare's BMI requirement?

If your BMI is below 35, Medicare will not pay for bariatric surgery. Some private insurance plans have different BMI thresholds, and some bariatric centers offer self-pay options. Talk with your doctor about whether surgery is medically necessary for you and explore other options for weight management.

Can I have bariatric surgery if I've already had stomach surgery?

Previous abdominal surgery does not automatically disqualify you, but it can affect which type of bariatric procedure is possible. The bariatric surgery team will review your surgical history and imaging to determine whether you are a candidate. Some types of prior surgery make certain bariatric procedures unsafe, but alternatives may still be available.

How long does it take from referral to surgery?

The timeline varies by center and how busy they are. Typically, you have your first evaluation within a few weeks, complete the supervised weight loss program over three to six months, and then have surgery scheduled. The entire process from referral to surgery often takes four to nine months, though some centers move faster.

Will Medicare pay if my doctor says surgery is medically necessary but my BMI is slightly below 35?

No. Medicare's BMI thresholds are firm requirements. If your BMI is 34, Medicare will not cover surgery even if your doctor believes it would help. If you are close to the threshold, ask your doctor whether losing a small amount of weight first would make you may be able to access, or explore whether your private insurance has different coverage rules.