If you have Original Medicare and meet the eligibility requirements, bariatric surgery is covered, but you’ll still owe out-of-pocket costs. For 2025, that starts with a $1,676 Part A hospital deductible, plus 20% coinsurance on surgeon and other provider fees under Part B. Your total out-of-pocket for the surgery itself typically falls between $2,000 and $5,000 with Original Medicare alone, though the exact amount depends on the procedure, your hospital stay, and whether you have supplemental coverage.
What Medicare Covers
Medicare covers three types of bariatric surgery. Roux-en-Y gastric bypass (open or laparoscopic), biliopancreatic diversion with duodenal switch, and laparoscopic sleeve gastrectomy are all eligible for coverage. Laparoscopic adjustable gastric banding (lap-band) has been covered since 2006, though it’s fallen out of favor and fewer surgeons perform it today. Sleeve gastrectomy, which is now the most commonly performed bariatric procedure in the U.S., has been covered since 2012.
Newer or experimental weight loss procedures, such as intragastric balloon placement or endoscopic sleeve gastroplasty, are not covered by Medicare.
Eligibility Requirements
Medicare doesn’t cover bariatric surgery for weight loss alone. You must meet all three of these criteria:
- BMI of 35 or higher. This is lower than the BMI 40 threshold many private insurers use, which means more people qualify through Medicare than they might expect.
- At least one obesity-related health condition. Type 2 diabetes, hypertension, heart disease, respiratory conditions like sleep apnea, and other obesity-related comorbidities all count. CMS specifically added Type 2 diabetes to the list in 2009.
- Previous unsuccessful medical treatment for obesity. You need documentation showing that supervised weight loss efforts, such as diet programs or medical management, haven’t worked. Many Medicare Administrative Contractors require a period of physician-supervised weight loss before approving surgery, often six months of documented visits, though the exact duration varies by region.
That last point is worth planning for. If your doctor hasn’t been documenting your weight loss efforts, you may need several months of office visits before you can get approved. Each of those visits is typically covered under Part B with standard cost-sharing.
Breaking Down Your Out-of-Pocket Costs
With Original Medicare, bariatric surgery costs come from two buckets: Part A (the hospital stay) and Part B (the surgeon’s fees, anesthesia, and outpatient services).
For Part A, you pay a single deductible per hospital admission. In 2025, that deductible is $1,676. In 2026, it rises to $1,736. This covers up to 60 days of inpatient care, so for a typical bariatric surgery hospital stay of one to three days, you won’t owe additional daily copays beyond the deductible.
For Part B, you pay a $257 annual deductible in 2025 (rising to $283 in 2026), then 20% coinsurance on the Medicare-approved amount for surgeon fees, anesthesiology, lab work, and other provider charges. The surgeon’s Medicare-approved fee for a gastric bypass or sleeve gastrectomy typically runs several thousand dollars, so your 20% share could be $500 to $1,500 or more depending on the procedure and your geographic area.
Pre-surgical evaluations, including nutritional counseling and any required medical assessments, are generally covered under Part B with the same 20% coinsurance.
With Medigap or Medicare Advantage
A Medigap (Medicare Supplement) plan can significantly reduce what you owe. Plans C, F, and G, for example, cover the Part A deductible and most or all of the Part B coinsurance. With a comprehensive Medigap plan, your out-of-pocket for the surgery itself could drop to little more than your monthly premiums.
Medicare Advantage plans cover the same bariatric procedures as Original Medicare (they’re required to), but the cost structure is different. Instead of the Part A deductible plus open-ended 20% coinsurance, Advantage plans charge copays or coinsurance with an annual out-of-pocket maximum. That cap is set at $9,350 for in-network services in 2026, though many plans set their limit lower. If you’re on a Medicare Advantage plan, check your plan’s specific cost-sharing for inpatient surgery. Some plans charge a flat copay per hospital day, others a percentage. Prior authorization is almost always required.
Where You Have the Surgery Matters
Medicare requires that bariatric surgery be performed at an accredited facility. Historically, CMS mandated certification by either the American College of Surgeons as a Level 1 Bariatric Surgery Center or the American Society for Bariatric Surgery as a Bariatric Surgery Center of Excellence. CMS has proposed removing this facility certification requirement after reviewing evidence that it didn’t improve patient outcomes, but the requirement has been in place since 2006. Before scheduling, confirm that your chosen hospital or surgical center meets Medicare’s current facility standards, or your claim could be denied entirely.
Costs Medicare Won’t Cover
Several expenses related to bariatric surgery fall outside Medicare coverage, and they can add up. Lifelong vitamin and mineral supplements are medically necessary after gastric bypass and duodenal switch procedures because these surgeries reduce your body’s ability to absorb nutrients. You’ll typically need daily calcium, iron, B12, and multivitamin supplements indefinitely. Medicare does not cover over-the-counter vitamins, so budget $30 to $75 per month for these depending on the brands you choose.
Body contouring or skin removal surgery after major weight loss is another common question. Medicare generally does not cover cosmetic procedures. In rare cases where excess skin causes documented medical problems like chronic infections or skin breakdown, a panniculectomy (removal of the abdominal skin fold) may be covered, but approval is difficult to obtain and requires extensive documentation.
Special protein supplements, meal replacements, and dietary foods recommended during the post-surgical liquid and soft food phases are also out-of-pocket expenses. The first two to three months after surgery often require specific nutritional products that can cost $100 to $200 total.
Typical Total Cost Estimates
Without any insurance, bariatric surgery in the United States ranges from roughly $15,000 to $35,000 depending on the procedure and location. With Original Medicare and no supplemental coverage, most beneficiaries pay between $2,000 and $5,000 out-of-pocket for the surgery and related provider fees. With a good Medigap plan, that number can drop below $500. With a Medicare Advantage plan, your costs depend on your plan’s specific copay and coinsurance schedule, but the annual out-of-pocket cap provides a ceiling.
The less visible costs, including months of pre-surgical office visits, post-operative follow-up appointments (typically frequent in the first year), and lifelong supplements, add ongoing expenses that are worth factoring into your planning. Most post-operative follow-up visits are covered under Part B with standard coinsurance, but the visit frequency (often monthly for the first six months, then quarterly) means those 20% copays accumulate.