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The current benchmark is the 2022 guideline from the American Society for Metabolic and Bariatric Surgery (ASMBS) and the International Federation for the Surgery of Obesity and Metabolic Disorders (IFSO). It recommends surgery for adults with a BMI of 35 or higher regardless of other health conditions, and says surgery should be considered at a BMI of 30 to 34.9 when metabolic disease such as type 2 diabetes is present. It also lowers the BMI thresholds for people of Asian descent. It replaces the 1991 NIH criteria (BMI 40, or 35 with an obesity-related condition). Insurance plans set their own rules, though, and some still apply the older cutoffs. A connected program can check where you stand under both.

It depends on the plan. Medicare’s national coverage policy (NCD 100.1) requires a BMI of 35 or higher, at least one obesity-related condition such as type 2 diabetes, and an earlier unsuccessful attempt at medical treatment for obesity. Under that policy gastric bypass, laparoscopic adjustable gastric banding, and duodenal switch are nationally covered, while sleeve gastrectomy is decided by regional Medicare contractors and gastric balloons are not covered. Private plans and Medicaid vary widely. Many ask for documented BMI and health conditions, records of earlier weight-loss attempts, and sometimes a supervised diet period or specialist evaluations before approving, and some only pay for care at accredited centers. The surgeon’s office normally submits the prior authorization, and a denial can usually be appealed. A connected program can explain what your plan requires.

Each operation trades off differently. In a sleeve gastrectomy the surgeon removes most of the stomach, leaving a narrow tube, and nothing is rerouted. Gastric bypass creates a small pouch and connects it to a lower section of intestine, which limits intake and also reduces absorption. Duodenal switch and SADI-S pair a sleeve with a longer intestinal bypass, giving the strongest absorption effect and requiring the most intensive vitamin monitoring. In 2024 national accreditation data, sleeve made up about 58% of procedures and bypass about 33%, with banding, duodenal switch, SADI-S, and one-anastomosis bypass each under 2%. Surgeons weigh your BMI, reflux, diabetes, earlier operations, and goals; reflux can worsen after a sleeve, so it comes up often. A connected surgeon can walk through which fits you.

Results vary by person and operation. In a large analysis presented at the 2026 ASMBS annual meeting, patients who had not used GLP-1 medications beforehand lost an average of about 28 to 29 percent of their total body weight one to three years after gastric bypass, and about 22 to 23 percent after sleeve gastrectomy. Averages hide wide individual differences. Most of the loss typically comes in the first 12 to 18 months. Keeping it off depends on follow-up, nutrition, and activity, and regain does happen, which is one reason revision operations exist. A connected surgeon can discuss realistic expectations for your situation.

It does not have to be either-or. The 2022 guideline describes surgery as the most effective evidence-based obesity treatment across BMI classes, and medications are another option that some people use before or after an operation. In the same 2026 meeting analysis, patients who lost weight on a GLP-1 drug before surgery still had substantial results afterward, averaging about 25 percent total weight loss after bypass and 20 percent after sleeve, somewhat below patients who had not used the drugs. Procedure volume at accredited centers fell below 200,000 in 2024 as GLP-1 use grew, though the researchers did not study cause. A connected program can help you compare the paths.

ASMBS says the safety profile is comparable to common operations such as gallbladder removal, appendectomy, and knee replacement. For gastric bypass, 30-day mortality is reported at roughly 0.1 to 0.2 percent. Risks still exist: leaks at staple lines, bleeding, blood clots, strictures, reflux, dumping syndrome after bypass, and nutrient deficiencies that call for lifelong supplements and lab monitoring. Accreditation through MBSAQIP, a program of the American College of Surgeons and ASMBS, is a useful screen; more than 900 U.S. centers held it in 2022. A connected program can tell you about its accreditation and its surgeons’ experience.

Expect lifelong follow-up. Many programs schedule visits around 3, 6, 9, 12, 18, and 24 months and yearly after that, with bloodwork and daily vitamin and mineral supplements. If you may want a pregnancy, ASMBS and the American Association of Clinical Endocrinology advise avoiding conception for 12 to 18 months after surgery, and ACOG suggests 12 to 24 months. Rapid weight loss can also change how well some birth control methods work, so plan with your surgical and reproductive-health teams. A connected program can explain what its follow-up looks like.