BCBS OF TN
It just occurred to me that you are likely referring to gastric bypass surgery....my earlier reply was regarding plastic surgery.
For my gastric bypass surgery approval...it was a breeze. Got an answer within a week (I had called to make certain they got all the paperwork and found it had been approved the day before). It's very important to have six months of physician supervised weight loss attempts (consecutive months). Have your doctor be sure to document you talked about calories, portion size and exercise. Other than that, I was over 100 pounds over weight and had two co-morbidities.
My surgery was March 28, 2005 and to date, I have lost 204 pounds. I am now looking to have plastic surgery.
Good luck with getting your surgery approved!