Yes, Medicare covers bariatric surgery, but only for beneficiaries who meet specific medical criteria. You must have a BMI above 35, at least one obesity-related health condition, and a documented history of unsuccessful medical weight loss treatment. Not every type of weight loss surgery qualifies, and the details of your coverage will depend on whether you have Original Medicare or a Medicare Advantage plan.
Who Qualifies for Coverage
Medicare’s National Coverage Determination for bariatric surgery lays out three requirements that must all be met. First, your BMI must be greater than 35. For reference, that’s roughly 220 pounds for someone who is 5’6″ or 250 pounds for someone who is 5’9″, though the exact threshold depends on your height. Second, you need at least one comorbidity related to obesity. Common qualifying conditions include type 2 diabetes, obstructive sleep apnea, heart disease, and hypertension, though the policy doesn’t limit the list to those specific diagnoses. Third, you must show that previous medical treatment for obesity was unsuccessful. This typically means a supervised weight loss program documented in your medical records.
That third requirement is where many people hit a roadblock. “Previously unsuccessful with medical treatment” is not precisely defined in the national policy, so what counts can vary. Some providers interpret this as a six-month physician-supervised diet, while others may accept a longer or shorter documented history. If you’re considering surgery, start building that paper trail with your doctor well in advance.
Which Procedures Are Covered
Medicare nationally covers three types of bariatric surgery:
- Roux-en-Y gastric bypass (RYGBP): Open or laparoscopic. This procedure reroutes a portion of the digestive system so food bypasses most of the stomach and part of the small intestine.
- Biliopancreatic diversion with duodenal switch (BPD/DS): Open or laparoscopic. A more extensive surgery that removes a large portion of the stomach and reroutes a significant length of the small intestine.
- Laparoscopic adjustable gastric banding (LAGB): An inflatable band placed around the upper part of the stomach to create a small pouch that limits food intake.
Laparoscopic sleeve gastrectomy, the most commonly performed bariatric procedure in the U.S. today, falls into a slightly different category. Since June 2012, it has been eligible for coverage, but the decision is made by your regional Medicare Administrative Contractor rather than being guaranteed nationally. In practice, most contractors do cover it when the same three eligibility criteria are met. Still, it’s worth confirming with your specific plan before assuming approval.
Procedures Medicare Does Not Cover
Several procedures are explicitly excluded regardless of your medical situation: open adjustable gastric banding, open sleeve gastrectomy, vertical banded gastroplasty (open or laparoscopic), gastric balloon devices, and intestinal bypass surgery. These exclusions apply to all Medicare beneficiaries with no exceptions.
Facility and Surgeon Requirements
Between 2006 and 2013, Medicare required bariatric surgery to be performed at a certified Center of Excellence, accredited by either the American College of Surgeons or the American Society for Bariatric Surgery. That requirement was removed in September 2013 after CMS concluded the certification mandate was not improving health outcomes for Medicare patients. Today, there is no special facility certification required for Medicare to cover the procedure.
That said, many surgeons and hospitals still carry accreditation through the Metabolic and Bariatric Surgery Accreditation and Quality Improvement Program (MBSAQIP). Choosing an accredited center is not a Medicare requirement, but it can be a useful quality signal when selecting a surgeon.
What You’ll Pay Out of Pocket
Medicare does not publish a flat cost for bariatric surgery because your expenses depend on several variables: your deductible status, whether your surgeon accepts Medicare assignment, the type of facility, and any supplemental insurance you carry. Under Original Medicare (Part A for the hospital stay, Part B for the surgeon’s fees), you are responsible for your Part A inpatient deductible and then a daily coinsurance if your stay exceeds a certain number of days. For the surgeon and anesthesiologist, Part B typically covers 80% of the Medicare-approved amount after your annual deductible, leaving you with the remaining 20%.
If you have a Medigap (supplemental) policy, it may cover some or all of that 20% coinsurance. Without supplemental coverage, a 20% share of a major surgery can still be a significant bill. Bariatric procedures at hospitals can run tens of thousands of dollars before Medicare’s negotiated rate is applied, so clarifying your cost share in advance is important.
Medicare Advantage Plans
Medicare Advantage plans (Part C) must cover everything Original Medicare covers, including bariatric surgery when the eligibility criteria are met. However, these plans can layer on additional requirements. Many Advantage plans require prior authorization before surgery, may limit you to in-network surgeons and facilities, and could impose different cost-sharing structures like flat copays instead of percentage-based coinsurance. Some plans also mandate specific pre-operative steps, such as a set number of months in a supervised weight management program or a psychological evaluation, before they will authorize the procedure.
If you’re on a Medicare Advantage plan, call the plan directly to ask about prior authorization timelines and any pre-surgical requirements beyond the national eligibility criteria. Getting this information early can prevent delays or unexpected denials.
Pre-Surgery Steps to Expect
Beyond Medicare’s three formal criteria, most bariatric programs require several pre-operative evaluations before scheduling surgery. A psychological assessment is standard. This evaluation screens for untreated mental health conditions, eating disorders, and substance use that could affect surgical outcomes or your ability to follow post-operative guidelines. If concerns are identified, you may be asked to complete a course of therapy, often cognitive behavioral therapy or counseling, before being cleared.
Nutritional counseling is also typical. You’ll work with a dietitian to understand the dramatic dietary changes required after surgery, including the transition from liquid to pureed to solid foods over several weeks. If you smoke, expect to be told to quit well before your surgery date. Smoking significantly increases the risk of post-surgical complications including infection, ulcers, and poor wound healing.
Medicare does separately cover obesity screening and behavioral counseling through your primary care provider as a preventive benefit, which can serve double duty as part of your documented medical treatment history.
Skin Removal After Weight Loss
Significant weight loss after bariatric surgery often leaves excess skin, particularly around the abdomen, arms, and thighs. Medicare generally does not cover cosmetic surgery, but it does recognize an exception when a procedure addresses a functional problem rather than a purely appearance-based concern. A panniculectomy, which removes the hanging skin and tissue from the lower abdomen, can be covered when it is medically necessary, for example if the excess skin causes chronic rashes, infections, or interferes with mobility.
Medicare requires prior authorization for panniculectomy. Your surgeon will need to submit documentation showing the medical necessity before the procedure is approved. Purely cosmetic body contouring, such as a tummy tuck or arm lift performed solely for appearance, is not covered.
What Medicare Does Not Cover After Surgery
After bariatric surgery, you will need lifelong vitamin and mineral supplements because your body absorbs fewer nutrients from food. Common requirements include a daily multivitamin, calcium, vitamin D, vitamin B12, and iron. Medicare does not cover over-the-counter vitamins or supplements, so this becomes a permanent out-of-pocket expense. Depending on the brands and dosages your surgeon recommends, expect to spend roughly $30 to $75 per month on supplements. Meal replacement shakes and specialized post-surgical foods are also not covered.
Follow-up visits with your surgeon and lab work to monitor nutritional levels are covered under Part B, as these are standard medical services. The gap is specifically in the supplements and dietary products themselves.