Does Medicare Pay for Weight-Loss Surgery?
Unlike GLP-1 drugs, bariatric surgery has a clear coverage pathway under Original Medicare — but only if you meet specific medical criteria first.
Yes, if you meet the medical criteria. Original Medicare covers certain bariatric procedures — including gastric bypass, adjustable gastric banding, and biliopancreatic diversion with duodenal switch — for beneficiaries with a BMI of 35 or higher who also have at least one obesity-related health condition and a documented history of unsuccessful medical weight-loss treatment. Not every weight-loss procedure qualifies, and not everyone who wants surgery will meet the bar. Standard Part A/B cost-sharing applies once you're approved.
Weight-loss surgery is one of the more clearly defined areas of Medicare coverage compared to GLP-1 drugs, which are tangled up in formulary exclusions and diagnosis codes. CMS has a specific national coverage determination that spells out exactly which procedures qualify, what health criteria a patient must meet, and what doesn't count. That doesn't mean it's simple to get approved — the criteria are strict and require real documentation — but at least the rules themselves are consistent nationwide.
The medical criteria you need to meet
Under CMS's national coverage determination for bariatric surgery, Medicare considers these procedures reasonable and necessary when a beneficiary has:
A BMI of 35 or higher
This is the primary threshold. Some Medicare Administrative Contractors may consider a BMI of 30–34.9 with a serious comorbidity on a case-by-case basis, but that's not guaranteed nationwide.
At least one obesity-related comorbidity
Common qualifying conditions include type 2 diabetes, high blood pressure, obstructive sleep apnea, coronary artery disease, or high cholesterol.
A history of unsuccessful medical treatment
You need documentation showing prior attempts at weight loss through medical means — such as a supervised diet, behavioral counseling, or obesity medication — that didn't achieve lasting results.
Medical necessity, documented by your physician
Your doctor has to formally document that surgery is medically necessary for your specific health situation, not just requested for cosmetic reasons.
Which procedures are covered — and which aren't
Medicare covers open and laparoscopic Roux-en-Y gastric bypass, laparoscopic adjustable gastric banding (lap-band), and open and laparoscopic biliopancreatic diversion with duodenal switch, when the criteria above are met. Laparoscopic sleeve gastrectomy may also be covered, but CMS leaves that specific determination to local Medicare Administrative Contractors rather than mandating it nationwide, so coverage can vary by region.
Several procedures are explicitly not covered under Medicare's national coverage determination, regardless of BMI or health status: gastric balloon procedures, intestinal bypass, and open or laparoscopic vertical banded gastroplasty. If a provider recommends one of these, ask directly whether Medicare covers it before scheduling, since you could be responsible for the full cost.
Do you need an accredited facility?
Historically, Medicare required bariatric surgery to be performed at a facility certified by an accrediting body. CMS removed that federal certification requirement in 2013, concluding there wasn't sufficient evidence that certification alone improved outcomes for Medicare beneficiaries. That means Original Medicare no longer requires you to use an accredited center specifically to get coverage — though many hospitals and surgeons continue to maintain outside accreditation on their own, and if you're enrolled in a Medicare Advantage plan, that plan may set its own network or facility requirements separate from Original Medicare's rules.
What you'll pay, and how to check your specific plan
If your surgery is approved under Original Medicare, standard Part A and Part B cost-sharing rules apply. An inpatient hospital stay is billed under Part A, subject to your Part A deductible; outpatient services, physician fees, and pre-surgical evaluations fall under Part B, subject to your Part B deductible plus 20% coinsurance. A Medigap policy can help offset that coinsurance, which matters given how much a hospital-based surgical procedure can cost. If you have a Medicare Advantage plan instead, your cost-sharing, prior authorization requirements, and in-network facility rules will follow that plan's specific structure rather than Original Medicare's.
Before scheduling anything, ask your surgeon's office to confirm in writing that your case meets Medicare's coverage criteria and to submit any required prior authorization. It's also worth asking your primary care doctor to make sure your documented weight-loss attempts and comorbidities are clearly recorded in your chart well before your consultation, since incomplete documentation is one of the most common reasons a claim gets delayed or denied.
Frequently Asked Questions
What BMI do I need for Medicare to cover weight-loss surgery?
Generally a BMI of 35 or higher, along with at least one obesity-related health condition such as type 2 diabetes, high blood pressure, obstructive sleep apnea, or coronary artery disease. Your Medicare Administrative Contractor may evaluate individual cases with a BMI between 30 and 34.9 with a serious comorbidity, but that's not guaranteed.
Which weight-loss surgeries does Medicare cover?
Medicare covers Roux-en-Y gastric bypass, laparoscopic adjustable gastric banding, and biliopancreatic diversion with duodenal switch when medical criteria are met. Laparoscopic sleeve gastrectomy may also be covered, but that decision is left to your local Medicare Administrative Contractor. Gastric balloon procedures, intestinal bypass, and vertical banded gastroplasty are not covered.
Do I need to try dieting first before Medicare will cover surgery?
Yes. Medicare requires documentation that you've previously attempted and been unsuccessful with medical treatment for obesity, such as a supervised diet program, before it will approve coverage for bariatric surgery.
Does the surgical facility need special accreditation for Medicare to pay?
No longer. CMS removed its facility certification requirement for bariatric surgery in 2013. Many hospitals and surgeons still choose to maintain outside accreditation, and some private insurers or Medicare Advantage plans may still expect it, but it is not a Medicare Part A or B requirement.
How much will I pay out of pocket for a covered bariatric surgery?
Standard Original Medicare cost-sharing applies: your Part A hospital deductible if you're admitted as an inpatient, or your Part B deductible plus 20% coinsurance for outpatient and physician services. A Medigap policy can help cover that coinsurance, and a Medicare Advantage plan will apply its own cost-sharing structure instead.
This article is for general educational purposes and reflects Medicare rules as of August 2026. It is not medical or insurance advice. Coverage depends on your individual health history and documentation — confirm your specific case with your doctor, your surgeon, and your Medicare plan.