Does Medicare Cover Bariatric Surgery? 2026 Weight Loss Surgery Guide

Yes - Original Medicare covers bariatric surgery for treatment of severe obesity when specific medical criteria are met. This surprises many people who assume Medicare only pays for procedures that treat established diseases, not weight management. But since 2006, Medicare has formally covered bariatric procedures when obesity itself is creating documented health problems and other treatments have not been sufficient.

The critical word is criteria. Medicare does not cover bariatric surgery on request - you need a qualifying BMI, at least one weight-related comorbidity, documentation of prior conservative treatment, and surgery performed at a Medicare-enrolled facility. This guide explains exactly what qualifies, which procedures are covered, what you will pay in 2026, and where Medicare Advantage and Part D fit in.

Who Qualifies for Medicare-Covered Bariatric Surgery

Medicare’s National Coverage Determination (NCD 100.1) sets out four conditions that must all be satisfied before the program will pay for bariatric surgery.

1. Body Mass Index Requirement

Your BMI must be 35 or higher. For most adults, a BMI of 35 means roughly 50 to 100 pounds above a “healthy” weight depending on height. Medicare does not cover bariatric surgery for patients with a BMI below 35, even if significant weight-related health problems are present.

If your BMI is between 30 and 34.9, Original Medicare will not cover bariatric surgery at this threshold, though some Medicare Advantage plans have adopted lower BMI cutoffs for certain high-risk patients - check your plan’s Evidence of Coverage for exact terms.

2. At Least One Obesity-Related Comorbidity

A BMI of 35 or higher alone is not enough. Medicare requires that your weight has caused or substantially worsened at least one of the following conditions:

• Type 2 diabetes (the most common qualifying condition)
• Hypertension (high blood pressure controlled by medication or diet)
• Hyperlipidemia (high cholesterol or triglycerides)
• Obstructive sleep apnea or obesity-hypoventilation syndrome
• Nonalcoholic fatty liver disease (NAFLD) or nonalcoholic steatohepatitis (NASH/MASH)
• Osteoarthritis of a weight-bearing joint (hip, knee, ankle)
• Urinary stress incontinence
• Gastroesophageal reflux disease (GERD) in some cases

Your physician must document the comorbidity in your medical record and establish a clinical connection to your weight. If you have diabetes and are on Medicare, bariatric surgery is one of the strongest-evidenced interventions for achieving remission - about 80 percent of patients with type 2 diabetes see significant improvement or complete remission after Roux-en-Y gastric bypass. See the Medicare and diabetes coverage guide for how Medicare covers diabetes management more broadly.

3. Prior Conservative Treatment

Medicare expects documentation that you have attempted to lose weight through non-surgical means before surgery is considered. This typically means a physician-supervised diet and exercise program lasting at least several months, with records showing the approach was tried but was insufficient to resolve the comorbidities.

Important clarification: Medicare’s NCD does not mandate a specific 6-month wait period as a strict pre-authorization requirement in the way some older guidance suggested. However, your surgeon and any Medicare Advantage plan you are enrolled in may have their own requirements. Your bariatric surgery program will walk you through the documentation needed for your specific coverage pathway.

4. Medicare-Enrolled Facility

The surgery must be performed at a facility that is enrolled in Medicare and meets the applicable standards for bariatric surgery. Most established hospital-based bariatric programs and accredited surgical centers meet this requirement. Your surgeon’s office will confirm that the facility participates with Medicare before scheduling.

Which Bariatric Procedures Does Medicare Cover

Medicare covers the following bariatric surgical procedures when the criteria above are met:

Roux-en-Y Gastric Bypass (RYGB)

The most studied bariatric procedure, available as both open surgery and laparoscopic surgery. The surgeon creates a small stomach pouch and reroutes the small intestine, reducing both the amount you can eat and caloric absorption. Medicare covers both the open and laparoscopic (minimally invasive) versions. Laparoscopic is now the standard approach at most centers.

Sleeve Gastrectomy

The surgeon removes approximately 75-80 percent of the stomach, leaving a narrow tube or “sleeve.” This is now the most commonly performed bariatric procedure in the United States. Medicare covers both open and laparoscopic sleeve gastrectomy under the same criteria as gastric bypass.

Laparoscopic Adjustable Gastric Banding (Lap-Band)

An inflatable band is placed around the upper stomach to restrict food intake. The band can be adjusted by adding or removing saline. Medicare covers adjustable gastric banding, though the procedure has fallen out of favor at many centers due to higher long-term complication and revision rates compared to bypass and sleeve procedures.

Biliopancreatic Diversion with or without Duodenal Switch (BPD/DS)

A more extensive two-part procedure: a sleeve gastrectomy plus a rerouting of the small intestine similar to but more aggressive than gastric bypass. Used for patients with very high BMIs or severe metabolic disease. Medicare covers both the standard BPD and the BPD with duodenal switch.

What Medicare Does Not Cover

Medicare does not cover bariatric surgery in these situations:

• BMI below 35 - even with obesity-related health conditions present
• Surgery for cosmetic purposes - body contouring, panniculectomy (skin removal), or tummy tuck after weight loss are not covered unless a separate medical necessity exists
• Revision bariatric surgery - covered only if the revision is medically necessary due to a complication or failed prior procedure; purely elective conversion from one procedure type to another is not covered
• Non-surgical weight management programs - commercial diet programs, meal replacements, and similar interventions are not Medicare benefits

Part A vs. Part B: How Your Medicare Benefits Apply

Whether your bariatric surgery is billed under Part A or Part B depends on where it is performed.

Inpatient Surgery (Part A)

Most bariatric procedures are performed as inpatient admissions, with hospital stays typically ranging from one to three days. When you are formally admitted as an inpatient, Medicare Part A covers the hospitalization.

Your 2026 costs under Part A:

• Part A deductible: $1,676 per benefit period (this covers days 1-60 of the hospital stay)
• Days 1-60: $0 per day after the deductible
• Days 61-90: $419 per day coinsurance
• Beyond 90 days: lifetime reserve days or full cost

For a standard 1-3 day bariatric surgery admission, your out-of-pocket cost with Original Medicare is the $1,676 Part A deductible. If you have Medigap Plan G or Plan N, that deductible is covered (Plan G) or substantially covered (Plan N). See the Part A coverage guide for a full breakdown of inpatient cost rules.

Outpatient Surgery (Part B)

Some bariatric procedures - particularly laparoscopic gastric banding and selected sleeve gastrectomy cases - may be performed in an outpatient hospital or ambulatory surgery center setting. When performed as outpatient, Medicare Part B applies.

Your 2026 costs under Part B:

• Part B deductible: $257 per year (applies once; if you have already met it for the year, it does not apply again)
• Part B coinsurance: 20 percent of the Medicare-approved amount after the deductible
• Hospital outpatient copayment: the amount varies by facility and procedure

For a procedure with an approved amount of $10,000, your 20 percent coinsurance would be $2,000. Medigap Plan G eliminates both the deductible and the 20 percent coinsurance entirely for Part B-covered services. See What is Medicare Part B for how outpatient cost-sharing works.

2026 Out-of-Pocket Cost Summary

If you have a Medicare Savings Program that covers your deductibles and cost-sharing, your bariatric surgery costs may be $0 out of pocket regardless of the setting. These programs are based on income and are significantly underused.

Medicare Advantage and Bariatric Surgery

If you are enrolled in a Medicare Advantage plan (Part C) rather than Original Medicare, your plan is required to cover the same bariatric surgery benefits as Original Medicare - but with its own cost-sharing structure, provider network, and prior authorization requirements.

Key differences from Original Medicare:

Prior authorization is almost always required. Unlike Original Medicare, which does not require pre-approval for covered procedures, essentially all Medicare Advantage plans require prior authorization for bariatric surgery. Your surgeon’s bariatric program coordinator will typically handle this process, but you should confirm your plan’s requirements before scheduling. See Medicare Advantage vs. Original Medicare for a broader comparison.

You must use in-network providers. HMO plans require you to stay in network; PPO plans charge higher cost-sharing for out-of-network care. Confirm that both your bariatric surgeon and the surgery facility are in your plan’s network before proceeding. See Medicare Advantage HMO vs. PPO for how the two plan types handle specialist access.

Additional criteria may apply. Some Medicare Advantage plans require a longer physician-supervised pre-surgery program (often 3-6 months), additional psychological evaluation, or nutritional counseling sessions before authorizing surgery. These are requirements beyond Original Medicare’s NCD.

Cost-sharing varies by plan. Your copayment or coinsurance for bariatric surgery depends on your specific plan’s benefits, not the standard Part A/B rules. Review your Evidence of Coverage or call your plan before scheduling.

Medicare Part D and Weight Loss Medications

There is a common and important question about GLP-1 medications - drugs like semaglutide and tirzepatide that have shown dramatic weight loss results in clinical trials.

For type 2 diabetes: Medicare Part D covers GLP-1 agonists when prescribed for treatment of type 2 diabetes. Ozempic (semaglutide) and Mounjaro (tirzepatide) are covered on most Part D formularies when the prescribed indication is diabetes. See Medicare and diabetes coverage and the Medicare Ozempic and weight loss drugs guide for details on how these drugs are covered and what they cost.

For weight loss/obesity alone: As of 2026, Medicare Part D does not cover FDA-approved medications prescribed primarily for weight loss or obesity management. This means Wegovy (semaglutide 2.4 mg, indicated for chronic weight management) and Zepbound (tirzepatide indicated for obesity) are not Part D benefits when prescribed for weight loss in someone without type 2 diabetes.

This creates a gap: someone with severe obesity but not type 2 diabetes cannot access GLP-1 medications through Medicare Part D, even though those drugs might delay or eliminate the need for surgery. Legislation to change this exclusion has been proposed but had not been enacted as of late 2026. If this coverage expands, it may affect future demand for bariatric surgery among Medicare beneficiaries.

Post-Surgery Medicare Coverage

After bariatric surgery, you will need several types of follow-up care. Medicare covers all of the following when medically indicated.

Follow-up surgical visits: Office visits with your surgeon are covered under Part B at the standard 20 percent coinsurance.

Nutritional counseling: Medicare Part B covers up to 22 intensive behavioral therapy sessions in the first year for obese beneficiaries as part of the Intensive Behavioral Therapy for Obesity (IBT) benefit - at $0 out of pocket when performed by a primary care provider in a primary care setting. Registered dietitian counseling sessions are also covered under Part B for specific diagnoses including obesity.

Laboratory testing: Post-bariatric patients require ongoing monitoring for nutrient deficiencies (B12, iron, calcium, thiamine, and others depending on the procedure). Medicare covers clinical laboratory tests including these nutrient panels; most routine labs have no deductible or coinsurance.

Mental health support: Depression and anxiety are more common in bariatric surgery candidates and can recur post-surgery. Medicare Part B covers outpatient mental health therapy at 20 percent coinsurance. See Medicare mental health coverage for details.

Physical therapy: If your post-surgical recovery requires PT for mobility, strength, or balance, it is covered under Part B with a physician referral. See Medicare physical therapy coverage for visit limits and rules.

Management of related conditions: If bariatric surgery causes remission of type 2 diabetes or hypertension, your ongoing medication management is still covered under Part D and Part B respectively, though drug costs may decrease as prescriptions are adjusted.

5-Step Guide to Getting Bariatric Surgery Covered by Medicare

Step 1 - Confirm your eligibility criteria. Before approaching a bariatric program, verify that your BMI is 35 or higher and identify your qualifying comorbidity or comorbidities. Your primary care physician can help document both.

Step 2 - Get a referral to a Medicare-enrolled bariatric program. Ask your primary care physician to refer you to a bariatric surgery program at a Medicare-enrolled facility. The program’s insurance coordinator will verify your Medicare coverage and walk you through their specific documentation requirements.

Step 3 - Complete the pre-surgical evaluation process. This typically includes a physician evaluation, nutritional consultation, psychological clearance, and documentation of prior weight management attempts. Your bariatric team will gather the records needed to support Medicare’s coverage criteria.

Step 4 - Obtain prior authorization if you have Medicare Advantage. If you are enrolled in a Medicare Advantage plan, your bariatric program will submit the prior authorization request to your plan on your behalf. This can take 2-6 weeks; do not schedule surgery until authorization is confirmed in writing.

Step 5 - Confirm your cost-sharing obligations before surgery. Ask the facility for an estimate of your out-of-pocket costs based on your specific coverage (Original Medicare vs. Medicare Advantage, and whether you have a Medigap supplement). Confirm whether the surgery will be billed as inpatient or outpatient, as this significantly affects your costs.

Frequently Asked Questions

Does Medicare cover the Lap-Band (adjustable gastric banding)? Yes. Medicare covers laparoscopic adjustable gastric banding under the same criteria as gastric bypass and sleeve gastrectomy: BMI of 35 or higher with at least one comorbidity. The Lap-Band has become less common as sleeve gastrectomy and bypass procedures have shown better long-term results, but it remains a covered Medicare procedure.

Does Medicare cover sleeve gastrectomy? Yes. Laparoscopic sleeve gastrectomy is now one of the most commonly performed bariatric procedures in the United States, and Medicare covers it when the standard criteria are met. Many Medicare Advantage plans will also cover it, though prior authorization is required.

Does Medicare cover gastric bypass surgery? Yes. Roux-en-Y gastric bypass - both open and laparoscopic - is covered under Medicare’s National Coverage Determination for bariatric surgery when BMI is 35 or higher and at least one comorbidity is documented.

What BMI do you need for Medicare to cover bariatric surgery? Your BMI must be 35 or higher. Medicare does not cover bariatric surgery at a BMI of 30-34.9 under Original Medicare’s National Coverage Determination, though individual Medicare Advantage plans may apply different standards.

Does Medicare Advantage cover bariatric surgery? Yes, Medicare Advantage plans must cover bariatric surgery when Original Medicare would. However, MA plans can and typically do require prior authorization, may impose additional pre-surgical program requirements, and have their own network, copayment, and referral rules. Contact your plan before proceeding.

Does Medicare cover revision bariatric surgery? Medicare covers revision bariatric surgery only when it is medically necessary - typically due to a complication from the original procedure, inadequate weight loss with documented health consequences, or conversion from a failed procedure. Elective conversion from one bariatric procedure to another without documented medical necessity is generally not covered.

Does Medicare cover weight loss drugs like Wegovy or Zepbound? No. As of 2026, Medicare Part D does not cover medications whose primary indication is weight loss or obesity, including Wegovy (semaglutide 2.4 mg) and Zepbound (tirzepatide for obesity). GLP-1 agonists prescribed for type 2 diabetes - such as Ozempic and Mounjaro - are covered under Part D when the indication is diabetes treatment. See the Medicare Ozempic and weight loss drugs guide for a full breakdown.

How long do I need to try diet and exercise before Medicare approves bariatric surgery? Medicare’s National Coverage Determination does not mandate a specific minimum duration for pre-surgical conservative treatment. The requirement is documentation that conservative management has been tried and has not been sufficient to resolve the comorbidities. In practice, bariatric programs typically require 3-6 months of supervised treatment to build the clinical record needed for Medicare’s coverage criteria. Medicare Advantage plans may impose their own pre-surgical timeline requirements beyond Original Medicare’s NCD.

Sources

• Centers for Medicare and Medicaid Services. National Coverage Determination (NCD 100.1): Bariatric Surgery for Treatment of Co-Morbid Conditions Related to Morbid Obesity. cms.gov
• Medicare.gov. What Medicare Covers: Weight loss surgery. medicare.gov
• CMS. Medicare Part A: Inpatient Hospital Services. cms.gov
• Medicare.gov. Part B costs. medicare.gov
• CMS. Intensive Behavioral Therapy for Obesity. cms.gov