Medicare covers bariatric surgery, but only under specific conditions

Medicare Part B 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 — meaning your doctor documents that you have serious health problems caused by obesity that other treatments have not fixed. Medicare does not pay for surgery chosen for appearance or lifestyle reasons alone.

The coverage rules are the same whether you have Original Medicare or a Medicare Advantage plan, though Advantage plans may add their own requirements on top. You will need approval before surgery, not after, so the first step is talking to your doctor about whether you meet the criteria and whether your surgeon accepts Medicare.

Key Takeaways

  • Medicare covers bariatric surgery only if your BMI is 35 or higher with an obesity-related health condition, or BMI 40 or higher regardless of other conditions.
  • You must have tried medically supervised weight loss for at least three months before surgery, and your doctor must document this attempt.
  • Your surgeon must be in-network with Medicare and the hospital must be Medicare-approved; out-of-network surgery is not covered.
  • You need written approval from Medicare before the surgery date, which typically takes two to four weeks after your surgeon submits the request.
  • Medicare covers the surgery itself and the hospital stay, but not pre-surgery testing, nutritional counseling, or follow-up visits beyond what Medicare normally covers.

The BMI and health condition requirements

Medicare requires one of two situations. Either your BMI is 35 or higher and you have at least one obesity-related health condition (such as type 2 diabetes, heart disease, high blood pressure, or sleep apnea), or your BMI is 40 or higher with no other conditions required.

Your doctor calculates BMI from your height and weight. A BMI of 35 with a may have access to condition is the lower threshold; a BMI of 40 is the higher threshold that stands alone. Medicare does not cover surgery for people below these numbers, even if they have health problems they believe are weight-related.

The health condition must be documented in your medical record before you request approval. If you have diabetes or high blood pressure, your doctor's notes should already show this. If the condition is newer or less obvious, ask your doctor to document it clearly, because Medicare will ask to see the evidence.

The three-month supervised weight loss requirement

Before Medicare will approve surgery, you must have tried a medically supervised weight loss program for at least three months. This is not a casual diet — it means a program run by a doctor, nurse, or registered dietitian where your progress is tracked and documented.

The program can be in-person or virtual, but it must be supervised by a healthcare provider and there must be written records showing you attended and what happened. Your doctor's office may run such a program, or they may refer you to a weight loss clinic. Some hospitals offer these programs as well.

If you have already done this before, ask your doctor whether those records still count. Medicare sometimes accepts weight loss attempts from several years prior if they are well-documented, but this varies. It is safer to assume you need a fresh three-month attempt unless your doctor confirms otherwise.

How to request Medicare approval

Start by scheduling a consultation with a surgeon who accepts Medicare. During this visit, the surgeon will review your medical history, examine you, and decide whether you meet the criteria. If the surgeon believes you do, they will submit a request for approval to Medicare on your behalf.

The surgeon's office handles most of the paperwork. They will send Medicare your medical records, your BMI calculation, documentation of your health conditions, and proof that you completed the three-month weight loss program. You may need to sign forms authorizing the release of these records.

Medicare typically responds within two to four weeks. If approved, you will receive a letter stating the approval and the surgery can be scheduled. If denied, the letter will explain why. You have the right to appeal a denial, and your surgeon's office can help you understand the reason and whether an appeal is worth pursuing.

What Medicare pays for and what it does not

Medicare Part B covers the surgeon's fee, the hospital facility charge, and the cost of the surgery itself — whether that is gastric bypass, gastric sleeve, lap-band, or duodenal switch. The hospital stay is covered. Anesthesia is covered. Post-operative care during the hospital stay is covered.

Medicare does not cover pre-surgery testing such as sleep studies, cardiac workups, or imaging unless those tests are medically necessary for reasons unrelated to the surgery decision. Medicare does not cover nutritional counseling before or after surgery, though your surgeon may recommend it and you can pay out of pocket or check whether your supplemental insurance covers it.

Follow-up visits with your surgeon after discharge are covered under the standard surgical follow-up period (usually 90 days). Visits beyond that are covered only if Medicare would normally cover them — meaning if you have a complication or a medical reason for the visit, not routine post-surgery check-ins.

Medicare Advantage plans and bariatric surgery

If you have a Medicare Advantage plan, the plan must cover bariatric surgery at the same level as Original Medicare because the coverage rules are set by federal law. However, Advantage plans can add extra requirements, such as requiring surgery at a specific hospital or requiring additional counseling sessions.

Before you move forward with a surgeon, call your Advantage plan and ask whether they have additional approval steps beyond what Medicare requires. Some plans require their own pre-approval in addition to Medicare's approval. Others require the surgeon to be on their preferred list, which may be narrower than all Medicare-accepting surgeons.

Your Advantage plan will tell you whether there are any out-of-pocket costs beyond your normal copay or deductible. Original Medicare has no copay for bariatric surgery itself, but Advantage plans may structure costs differently.

What to do if Medicare denies your request

If Medicare denies approval, the denial letter will state the reason. The most common reasons are: BMI below the threshold, no documented obesity-related health condition, or incomplete documentation of the three-month weight loss program.

You have 180 days from the denial date to file an appeal. Your surgeon's office can help you gather additional medical records or documentation if the issue was incomplete paperwork. If the issue is that you do not meet the BMI or health condition criteria, an appeal is unlikely to succeed unless new medical information has emerged.

If you are close to the BMI threshold or if your health condition is borderline, ask your doctor whether waiting a few months and reapplying makes sense. Some people reapply after their health condition worsens or after additional weight gain, though this is not a strategy to pursue lightly.

Finding a Medicare-approved surgeon and hospital

Not all surgeons accept Medicare, and not all hospitals are Medicare-approved. You can search for bariatric surgeons in your area on the Medicare provider search tool at Medicare.gov, or call your local hospital and ask which surgeons on staff perform bariatric surgery and accept Medicare.

When you call a surgeon's office, ask directly: "Do you accept Medicare for bariatric surgery?" and "What is your approval process?" Some offices are experienced with Medicare approval and can walk you through it step by step. Others may be less familiar and may take longer to submit the paperwork correctly.

If there are no bariatric surgeons near you, Medicare may cover surgery at a more distant hospital if your doctor refers you there and documents that local options are not available. This is not automatic, so discuss it with your doctor and the surgeon's office before assuming it will be approved.

Frequently Asked Questions

Do I have to try weight loss medication before surgery?

No. Medicare requires a three-month medically supervised weight loss program, which typically includes diet, exercise, and behavioral counseling. Medication may be part of that program, but it is not a separate requirement. If you have already tried weight loss medication and it did not work, that does not prevent you from having surgery.

What if I had bariatric surgery before and now have Medicare?

Medicare will not pay to repeat the same surgery. If you had surgery years ago and now need revision surgery (because the first surgery failed or caused complications), Medicare may cover revision, but you will need to meet the same BMI and health condition criteria and go through the approval process again.

Does Medicare cover bariatric surgery if I am over 65?

Yes. Age alone does not disqualify you. Medicare will cover bariatric surgery for people over 65 if you meet the BMI, health condition, and weight loss program requirements. Your surgeon may have concerns about your overall health or ability to recover, but that is a medical decision between you and your doctor, not a Medicare rule.

Will my Medigap plan help pay if Medicare denies the surgery?

No. Medigap plans cover what Medicare covers — they fill in copays and deductibles, but they do not cover services Medicare has denied. If Medicare denies bariatric surgery, your Medigap plan will not pay for it either.

How long after approval can I have the surgery?

There is no time limit set by Medicare. Once you have approval, you can schedule surgery whenever you and your surgeon agree. Some surgeons have waiting lists, so the delay may be on their end rather than Medicare's. Ask the surgeon's office how far out their schedule is when you receive approval.