In general, bariatric surgery could be an option for you if: Your body mass index (BMI) is 40 or higher, called extreme obesity OR Your BMI is 35 to 39.9, called obesity, and you have a serious weight-related health problem, such as type 2 diabetes, high blood pressure or severe sleep apnea. In some cases, you may qualify for certain types of weight-loss surgery if your BMI is 30 to 34 and you have serious weight-related health problems.