I have Aetna Open Access they do require medical records for the past 2 years showing obesity. A six month diet and exercise program through your doctor, 3 months have to be consecuetive (sp) in the last 2 years. Lower BMI's require co-morbidities.
Here is a link to the policy
Obesity Surgery
As long as your employer did not exclude the surgery you should have good luck.
Personally, It took less that 1 week for me to be approved for my surgery, but I knew the requirements, and had done everything on the list, except the surgeons required pre-op tests & nutrition, before we submitted.
Julie