Medicare covers weight loss surgery, but only under specific medical conditions and with advance approval from your plan

Medicare Part B will pay for weight loss surgery if your doctor documents that you have a medical condition directly caused or worsened by your weight, and that surgery is medically necessary to treat that condition. The surgery itself is not covered because of weight alone — it is covered because it treats an underlying health problem. Your doctor must request approval before the surgery takes place, and Medicare will review the medical evidence to decide whether to cover it.

The most common surgeries Medicare covers are gastric bypass, gastric banding, and duodenal switch. Lap-band surgery and gastric sleeve procedures may also be covered depending on your specific situation and the medical evidence your doctor submits. Coverage varies slightly between Original Medicare and Medicare Advantage plans, so you will need to check with your plan directly about what it will pay.

Key Takeaways

  • Medicare covers weight loss surgery only when a doctor documents that a medical condition — such as diabetes, heart disease, or severe joint damage — is caused or worsened by weight, and surgery is medically necessary to treat it.
  • Your doctor must submit a request for approval to Medicare before the surgery, including medical records showing the condition and why surgery is the right treatment.
  • Medicare typically requires a body mass index (BMI) of 35 or higher with a related health condition, or a BMI of 40 or higher, though the exact requirement depends on the type of surgery and your medical history.
  • Original Medicare and Medicare Advantage plans may cover different surgeries or have different approval processes, so you should contact your plan before your doctor submits the request.
  • If Medicare denies the request, you have the right to appeal the decision and ask for a review of the medical evidence.

What medical conditions make you may be able to access for coverage

Medicare will consider covering weight loss surgery if you have a condition that your doctor can show is caused or made worse by excess weight. The most common conditions are type 2 diabetes, high blood pressure, heart disease, sleep apnea, and severe osteoarthritis of the knees, hips, or back. Your doctor must document in your medical record that the condition exists, that it is related to your weight, and that losing weight through surgery would improve or resolve it.

The condition itself must be serious enough that surgery is a reasonable treatment option. For example, if you have type 2 diabetes that is difficult to control with medication, or sleep apnea that causes you to stop breathing during sleep, Medicare is more likely to view surgery as medically necessary. If your condition is mild or well-controlled with medication alone, Medicare may decide that surgery is not the right next step.

BMI requirements and what they mean

Medicare generally requires a body mass index (BMI) of 35 or higher if you have a related health condition, or a BMI of 40 or higher if you do not have a documented condition. Your BMI is calculated from your height and weight — your doctor's office can calculate it for you, or you can use an online calculator with your height and current weight.

These are guidelines, not absolute cutoffs. Your doctor can request coverage even if your BMI is slightly lower if the medical evidence strongly supports that surgery will treat your condition. Similarly, having a BMI above 40 does not automatically mean Medicare will cover the surgery — your doctor still needs to show that a medical condition exists and that surgery is necessary to treat it.

How to start the approval process with your doctor

Talk to your primary care doctor or a specialist who treats your weight-related condition — such as a cardiologist, endocrinologist, or sleep medicine doctor — about whether weight loss surgery might help you. Your doctor will review your medical history, current medications, and test results to decide whether surgery is appropriate and whether to request Medicare approval.

If your doctor agrees that surgery may help, they will submit a request to Medicare that includes your medical records, a letter explaining why surgery is medically necessary, your BMI, and documentation of the related health condition. This request goes to Medicare's medical review team, not to you. You do not need to fill out a separate form or contact Medicare yourself at this stage — your doctor's office handles the submission.

The review process typically takes two to four weeks. Your doctor's office will receive Medicare's decision and will contact you with the result. If Medicare approves the request, you can move forward with scheduling the surgery. If Medicare denies it, your doctor can appeal the decision and submit additional medical evidence.

Differences between Original Medicare and Medicare Advantage

Original Medicare (Part A and Part B) covers weight loss surgery under the rules described above, as long as your doctor's request meets Medicare's medical necessity standards. You pay your Part B deductible and coinsurance, which is typically 20 percent of the approved amount after you meet your deductible.

Medicare Advantage plans must cover at least what Original Medicare covers, but they may have additional rules, higher out-of-pocket costs, or require you to use doctors within their network. Some Advantage plans require pre-approval before your doctor even submits the request to Medicare, or they may require a second opinion from a plan-approved surgeon. Call your Advantage plan's member services number — it is on your insurance card — and ask what steps you need to take before your doctor submits the approval request.

What happens if Medicare denies your request

If Medicare denies the request, you have the right to appeal. Your doctor can submit a new request with additional medical evidence, such as recent test results, a letter from a specialist explaining why surgery is necessary, or documentation that you have tried other treatments first and they did not work. Many denials are overturned on appeal when the doctor provides more detailed information.

You can also ask for a peer-to-peer review, in which your doctor speaks directly with a Medicare medical reviewer to discuss your case. This conversation sometimes leads to approval when the reviewer hears directly from your doctor why surgery is medically necessary in your situation. Your doctor's office can request this review on your behalf.

Out-of-pocket costs you may pay

If Medicare approves the surgery, you will pay your Part B deductible (which varies by year) and then 20 percent coinsurance of the approved amount. The total approved amount depends on where you have the surgery and what type of procedure you have. Hospital costs are covered under Part A, and you will pay your Part A deductible if you have not met it yet.

If you have a Medicare Advantage plan, your out-of-pocket costs depend on your plan's design. Some plans have a set copay for surgery, while others charge coinsurance. Check your plan documents or call member services to find out what you will owe. Some plans also require you to use in-network surgeons, which can affect your total cost.

Frequently Asked Questions

Does Medicare cover weight loss surgery just because I am overweight?

No. Medicare covers the surgery only when a doctor documents that you have a medical condition caused or worsened by your weight, and that surgery is medically necessary to treat that condition. Weight alone is not enough — there must be a related health problem such as diabetes, heart disease, or sleep apnea.

Can I choose any surgeon, or does Medicare require me to use a specific one?

With Original Medicare, you can use any surgeon who accepts Medicare. With a Medicare Advantage plan, you typically must use a surgeon in your plan's network, or you will pay more out of pocket. Check your plan documents or call member services to find out which surgeons are in your network.

What if my doctor thinks I need surgery but Medicare denies it?

Your doctor can appeal the denial and submit additional medical evidence. You can also request a peer-to-peer review, in which your doctor speaks directly with a Medicare medical reviewer. Many denials are overturned on appeal when more detailed medical information is provided.

How long does the approval process take?

The initial review typically takes two to four weeks from the time your doctor submits the request. If Medicare denies it and your doctor appeals, the appeal process may take an additional two to four weeks. Your doctor's office will keep you informed of the timeline.

Will Medicare cover the cost of follow-up visits and nutritional counseling after surgery?

Medicare covers medically necessary follow-up visits with your surgeon. Nutritional counseling and support groups may be covered if your doctor orders them as part of your post-surgery care, though coverage varies. Ask your doctor what follow-up care Medicare will cover in your situation.