Qualifications for Weight Loss Surgery Inova follows eligibility requirements for weight loss (bariatric) surgery established by the National Institutes of Health (NIH). Individuals must have a body mass index (BMI) of 40 or greater. In the presence of additional health risks, also known as co-morbidities, you may be eligible for weight loss surgery with a BMI of 35 or greater. This translates to being at least 100 pounds overweight. The presence of health risks, also called co-morbidities, include high cholesterol, high blood pressure, diabetes and sleep apnea, among others.