Medicare covers weight loss surgery in specific situations, but not for everyone who wants it

Medicare will pay for weight loss surgery if you meet strict medical criteria set by the Centers for Medicare & Medicaid Services (CMS). The surgery must be medically necessary to treat a serious health condition — not a choice for appearance or general weight management. You will need documentation from your doctor showing that you have tried other weight loss methods first, that your weight is causing significant health problems, and that surgery is appropriate for your situation.

The most common surgeries Medicare covers are gastric bypass, gastric banding, and duodenal switch. Medicare does not cover gastric sleeve surgery, though some Medicare Advantage plans may. Coverage varies by the specific procedure, your health history, and whether your doctor's documentation meets CMS requirements.

Key Takeaways

  • Medicare covers weight loss surgery only when you have a body mass index (BMI) of 35 or higher with obesity-related health conditions, or a BMI of 40 or higher regardless of other conditions.
  • Your doctor must document that you have tried medically supervised weight loss programs for at least three to six months before surgery and that surgery is medically necessary.
  • You will need a psychological evaluation and clearance from your surgeon before Medicare will pay, and your surgeon must be enrolled in Medicare.
  • Medicare Advantage plans may have different coverage rules than Original Medicare, so you should contact your specific plan to learn what it covers.
  • Even when Medicare covers the surgery, you will owe your deductible, coinsurance, and any costs for services that fall outside the covered procedure.

BMI requirements and health conditions Medicare looks at

Medicare uses body mass index (BMI) as the starting point for coverage decisions. You must have a BMI of 35 or higher and at least one obesity-related health condition, or a BMI of 40 or higher with no other conditions required. Obesity-related conditions that Medicare recognizes include type 2 diabetes, heart disease, high blood pressure, sleep apnea, and osteoarthritis of weight-bearing joints.

Your doctor will calculate your BMI using your height and weight. A BMI of 35 with a may have access to condition is the threshold — Medicare will not cover surgery for someone with a BMI of 34.5 and multiple health problems. The condition must be documented in your medical record and confirmed by your doctor as related to your weight.

Documentation your doctor must provide

Your doctor needs to submit specific paperwork to Medicare before the surgery can be approved. This includes your medical history, current medications, results of any weight loss programs you have completed, and a letter explaining why surgery is medically necessary in your case. The documentation must show that you have participated in a medically supervised weight loss program for at least three to six months within the two years before surgery.

The medically supervised program does not have to be expensive or specialized — it can be a series of visits with your primary care doctor or a registered dietitian where weight loss is monitored and documented. Medicare wants to see that you made a genuine effort with other methods first. Your doctor must also state that you understand the risks and benefits of surgery and that you are psychologically ready for it.

Psychological evaluation and surgeon requirements

Before Medicare will approve the surgery, you must have a psychological evaluation by a mental health professional. This evaluation assesses whether you understand what the surgery involves, whether you can follow the strict diet and lifestyle changes required afterward, and whether you have any untreated mental health conditions that would make surgery unsafe. The evaluator will write a report recommending whether you should proceed.

Your surgeon must be enrolled in Medicare and must have performed weight loss surgery regularly. Medicare does not cover surgery performed by surgeons who are not Medicare providers. Ask your doctor whether their surgeon meets this requirement before you move forward with planning.

What Medicare actually pays and what you owe

When Medicare covers weight loss surgery, it pays for the surgeon's fee, the facility fee, anesthesia, and related hospital or surgical center costs. You will still owe your Part B deductible (the amount you must pay out of pocket before Medicare begins to pay) and 20 percent coinsurance for the surgeon and facility charges after the deductible is met.

If you have a Medicare Advantage plan instead of Original Medicare, your out-of-pocket costs may be different. Some Advantage plans have a fixed copay for surgery, while others use coinsurance. You should contact your plan directly to learn what you will owe before you schedule surgery. Medicare does not cover follow-up visits with a nutritionist or dietitian after surgery, though some Advantage plans do.

Differences between Original Medicare and Medicare Advantage

Original Medicare follows the CMS coverage rules described above. Medicare Advantage plans (Part C) are run by private insurance companies and can set their own coverage rules as long as they cover at least what Original Medicare does. Some Advantage plans cover gastric sleeve surgery when Original Medicare does not. Others may require a higher BMI or different documentation.

If you have a Medicare Advantage plan, contact your plan's customer service line before you talk to your doctor about surgery. Ask specifically whether weight loss surgery is covered, what the BMI and health condition requirements are, which surgeons are in-network, and what your out-of-pocket costs will be. The answer depends entirely on your individual plan.

How to start the process with your doctor

Begin by scheduling an appointment with your primary care doctor and telling them you are interested in weight loss surgery. Bring your height and weight so your doctor can calculate your BMI. Your doctor will review your medical history and determine whether you meet the basic Medicare requirements. If you do, your doctor can refer you to a bariatric surgeon who accepts Medicare.

The surgeon's office will request your medical records from your doctor and may ask you to complete additional paperwork. The surgeon will schedule a consultation to discuss which procedure might work for you and to explain the risks and recovery process. At that visit, ask the surgeon's office whether they have submitted cases to Medicare before and how long approval typically takes — this varies by surgeon and by your local Medicare contractor.

Frequently Asked Questions

What if my BMI is 34 but I have serious health problems from my weight?

Medicare will not cover surgery with a BMI below 35, even with multiple weight-related conditions. If your BMI is 34.5 or 34.9, a small amount of weight loss might bring you below the threshold, but you would need to reach 35 to be considered. Talk with your doctor about whether waiting and losing a small amount of weight first makes sense for your health.

Does Medicare cover weight loss surgery if I have already tried it before?

Medicare may cover revision surgery if your first surgery failed or caused complications, but the rules are stricter. You will need documentation that the first surgery did not work as intended and that a second surgery is medically necessary. Contact Medicare or your surgeon's office to discuss your specific situation.

How long does it take Medicare to approve weight loss surgery?

Approval typically takes four to eight weeks after your surgeon submits all required documentation, but this varies. Some local Medicare contractors process requests faster than others. Ask your surgeon's office for an estimate based on their experience with your local contractor, and ask them to follow up if you have not heard back within the expected timeframe.

Will Medicare pay if my doctor says surgery is necessary but I do not meet the BMI requirement?

No. Medicare has set BMI thresholds that must be met regardless of your doctor's recommendation. Your doctor cannot override the BMI requirement by writing that surgery is medically necessary. If you are close to the threshold, ask your doctor whether a small amount of weight loss would help you reach it.

What happens if Medicare denies my request for surgery?

You have the right to appeal a denial. Your surgeon's office can help you file an appeal and submit additional documentation if something was missing from the first request. The appeal process takes additional weeks. You can also choose to pay for surgery out of pocket if you decide not to wait for an appeal decision.