Does Medicare Cover Weight Loss Surgery? Eligibility and Rules

Does Medicare cover weight loss surgery? Yes — Medicare covers certain bariatric (weight-loss) surgical procedures when specific medical criteria are met. The coverage comes with clear requirements that beneficiaries should understand before pursuing what is a significant, permanent medical decision. This article explains the 2026 rules, the procedures covered, likely costs, and how surgery coverage differs from coverage of weight-loss drugs. It is general education, not medical advice.

Obesity is common in older adults. The CDC reports that roughly 4 in 10 U.S. adults have obesity, which is associated with serious conditions including type 2 diabetes, cardiovascular disease, sleep apnea, and joint problems. For Medicare beneficiaries with severe obesity who have not responded to other treatments, weight loss surgery can be a covered, life-changing option. For a closer look at pricing, see our guide on gastric sleeve surgery cost.

Medicare’s Eligibility Requirements for Weight Loss Surgery

Under Medicare’s National Coverage Determination for bariatric surgery, coverage generally requires that all of the following be met and documented:

• A Body Mass Index (BMI) of 35 or higher combined with at least one obesity-related condition, such as type 2 diabetes, heart disease, obstructive sleep apnea, or severe hypertension.
• Previously unsuccessful medical treatment of obesity: documentation that you have tried and not succeeded with medically supervised, non-surgical weight management.
• Medical necessity: your physician certifies that the surgery is medically necessary and that the expected benefits outweigh the surgical risks.

These criteria reflect Medicare’s national policy as of 2026. Because Medicare periodically updates its coverage rules and because individual cases differ, confirm the current criteria and how they apply to you with Medicare or your surgical team before proceeding.

An Important Correction: The “Center of Excellence” Rule

You may still see older guides insisting that Medicare only pays if your surgery is performed at a certified “Center of Excellence.” That requirement was removed in 2013. Medicare no longer requires bariatric facilities to hold certification from the American College of Surgeons or the American Society for Metabolic and Bariatric Surgery for the surgery to be covered under Original Medicare.

That said, choosing an experienced, accredited program is still sensible for safety and outcomes, and — importantly — a Medicare Advantage plan may impose its own network and facility rules even though Original Medicare no longer does. Always verify network and authorization requirements with your specific plan.

What Bariatric Procedures Does Medicare Cover?

Medicare’s national policy covers several established procedures when the eligibility criteria are met:

• Roux-en-Y Gastric Bypass (RYGB): The surgeon creates a small stomach pouch and reroutes the small intestine to it, bypassing part of the stomach and upper small intestine. It has extensive long-term outcome data and is often called the gold-standard procedure.
• Sleeve Gastrectomy (Gastric Sleeve): About 80% of the stomach is removed, leaving a narrow, tube-shaped stomach. It has become the most commonly performed bariatric procedure in the United States. Under Medicare’s national policy, sleeve gastrectomy coverage is generally left to local Medicare Administrative Contractors, so confirm coverage in your region.
• Laparoscopic Adjustable Gastric Banding (Lap-Band): An adjustable band is placed around the upper stomach to create a small pouch that limits intake. It remains covered but has become less common because of higher long-term complication and revision rates and lower average weight loss.
• Biliopancreatic Diversion with Duodenal Switch (BPD/DS): A more complex procedure combining a sleeve with an intestinal bypass, typically reserved for patients with very high BMIs.

Medicare generally does not cover:

• Treatment of obesity that does not meet the coverage criteria
• Intragastric balloon procedures and endoscopic sleeve gastroplasty (typically not covered under the national policy)
• Surgery performed solely for cosmetic purposes

Because coverage of newer or endoscopic procedures can vary by contractor and evolve over time, verify any specific procedure with Medicare before scheduling.

Surgery vs. Weight-Loss Drugs: A Key Coverage Difference

Many people ask whether Medicare will simply cover a weight-loss medication such as a GLP-1 drug (for example, semaglutide or tirzepatide, sold under brand names like Wegovy and Zepbound) instead of surgery. Here the rules diverge sharply from surgery.

By law, Medicare Part D cannot cover drugs when they are used for weight loss alone. This is a longstanding statutory exclusion, not a plan-by-plan choice. So a GLP-1 prescribed purely to treat obesity is generally not a covered Part D benefit.

The nuance is that some of these same medications have been FDA-approved for other uses, and Medicare may cover them for an approved, non-weight-loss indication. For example, a GLP-1 approved to reduce the risk of serious cardiovascular events in people with established heart disease, or to treat a condition such as obstructive sleep apnea, may be covered when prescribed for that approved purpose. Coverage depends on the specific drug, its approved indication, and your plan’s formulary, so check your Part D plan and confirm the medical reason on the prescription. The bottom line: surgery is covered for obesity when criteria are met; drugs generally are not covered for obesity alone.

Out-of-Pocket Costs for Bariatric Surgery

Cost-sharing follows standard Original Medicare rules, split between Part A (inpatient) and Part B (outpatient). The dollar amounts below are set annually and change each year, so confirm the current figures with Medicare.

• Part A: If the surgery involves an inpatient hospital admission, the Part A hospital deductible applies per benefit period.
• Part B: For outpatient surgery and for physician, anesthesia, and pre/post-operative services, you generally pay 20% coinsurance after meeting the annual Part B deductible.
• Total cost varies widely by procedure, facility, and region. Your out-of-pocket share under Original Medicare can be substantial without additional coverage, which is why many beneficiaries carry supplemental coverage.

A Medigap (Medicare Supplement) policy can significantly reduce out-of-pocket costs by covering deductibles and coinsurance. Medicare Advantage plans use their own cost-sharing structures and include an annual out-of-pocket maximum that caps your total spending. For estimates specific to a procedure, see our guide on gastric sleeve surgery cost, and always get a written estimate from your surgical program.

Pre-Surgery Requirements and Preparation

Before surgery, you will typically complete several steps that are both good clinical practice and often part of getting coverage approved:

• Medical evaluation: a comprehensive assessment by your primary care physician and the bariatric team, including lab work, cardiac evaluation, and nutritional assessment.
• Psychological evaluation: a mental-health assessment of your readiness for the lasting lifestyle changes surgery requires.
• Nutritional counseling: Medicare covers intensive behavioral therapy for obesity, which includes counseling. Many programs also require participation in a supervised weight-management program for several months beforehand.
• Pre-operative diet: most surgeons require a pre-operative low-calorie or liquid diet for a few weeks to shrink the liver and reduce surgical risk.
• Smoking cessation: if you smoke, you will typically need to quit before surgery. Medicare covers smoking-cessation counseling.

The full preparation phase can take several months. While that timeline may feel long, it serves important medical and psychological purposes and is often expected before coverage is approved.

Medicare Advantage and Weight Loss Surgery

Medicare Advantage plans must cover bariatric surgery when it meets Medicare’s criteria, but they typically layer on additional requirements:

• Prior authorization: most Advantage plans require prior authorization, meaning documentation of eligibility, medical necessity, and pre-surgical preparation must be approved first.
• Network requirements: you generally must use in-network surgeons and facilities — a real difference from Original Medicare, which no longer requires facility certification.
• Different cost-sharing: plans may use fixed copayments and apply an annual out-of-pocket maximum.

If your plan denies coverage, you have the right to appeal, and the denial letter explains the process and deadlines. For more on how Medicare policy shapes surgical coverage, visit our healthcare policy guide.

Post-Surgery Coverage and Follow-Up

Medicare coverage continues after surgery for medically necessary follow-up care, including:

• Follow-up visits with your surgeon, covered under Part B
• Ongoing nutritional counseling as part of post-surgical care
• Lab work to monitor nutritional status, vitamin levels, and metabolic function
• Treatment of complications should they arise

Medicare typically does not cover:

• Body-contouring or excess-skin removal after weight loss, unless it is medically necessary (for example, for recurrent infections or functional impairment)
• Most over-the-counter vitamins and supplements, even though bariatric patients need lifelong supplementation (some prescription supplements may be covered under Part D)
• Gym memberships, though some Medicare Advantage plans include a fitness benefit

Frequently Asked Questions

What BMI qualifies for weight loss surgery under Medicare?

Medicare generally requires a BMI of 35 or higher along with at least one obesity-related condition, such as type 2 diabetes, hypertension, heart disease, or obstructive sleep apnea, plus documented prior unsuccessful medical treatment of obesity. Some private insurers and clinical guidelines have moved toward lower BMI thresholds, but Medicare’s national criteria are what apply to Medicare coverage. Verify the current rule before assuming eligibility.

Does Medicare cover gastric sleeve surgery?

Often yes, but with a caveat. Sleeve gastrectomy is widely covered when the eligibility criteria are met; under Medicare’s national policy, coverage of the sleeve is generally determined by your local Medicare Administrative Contractor. Confirm coverage in your region before scheduling.

How long is the hospital stay for bariatric surgery?

Most laparoscopic bariatric procedures involve a stay of roughly one to three days, and gastric sleeve or bypass patients often stay one to two nights. Some select patients have procedures done with shorter stays. Your surgical team will tell you what to expect.

Does Medicare cover revision bariatric surgery?

Medicare may cover revision surgery when it is medically necessary — for example, if a prior procedure failed or caused complications. The same eligibility criteria apply, and thorough documentation of medical necessity is essential. Approval can be more complex, so work closely with your surgeon and plan.

Will Medicare cover weight-loss medications instead of surgery?

Generally not for obesity alone. Medicare Part D is barred by law from covering drugs used solely for weight loss. However, a medication may be covered when it is prescribed for a separately FDA-approved use — such as reducing cardiovascular risk in people with heart disease, or treating obstructive sleep apnea — rather than for weight loss itself. Coverage depends on the drug, the approved indication, and your plan’s formulary, so check with your Part D plan.

Sources

• Centers for Medicare & Medicaid Services (CMS) — National Coverage Determination (NCD 100.1), Bariatric Surgery for Treatment of Morbid Obesity (facility-certification requirement removed effective 2013)
• Medicare.gov — Bariatric surgery coverage; Part A and Part B costs; 1-800-MEDICARE
• U.S. Food and Drug Administration (FDA) — approvals for anti-obesity medications (semaglutide, tirzepatide) and their indications
• Centers for Disease Control and Prevention (CDC) — Adult obesity prevalence