I can answer this way. I was sent, (from UPMC) instructional videos that demonstrated the procedures for Gastric Bypass and the LapBand, back in early 2009 from a counselor under one of their programs. After I viewed these procedures I adamantly declined to consider either of these procedures. My reasoning was side effects and these side effects would not be tolerable for what I deemed a quality of life for me and what I do. So although, when I called for pre-approval the first time (December 2009), I may not have known what questions to ask, however when I called UPMC Insurance the second time (January 2010), I knew to not misrepresent the procedure I was requesting e.g. VSG. I specifically asked for that procedure coverage (or hence I would not have started my 6-month supervised weight, diet, evaluation time period pre-surgery, because I had already declined the other two procedures).
Having been denied for my appeal, directed at the UPMC insurance company, and since I have an option, when I called Blue Cross of Illinois, I made sure I asked (three-times) if I would be covered for Bariatric Surgery AND specifically the Vertical Sleeve procedure, Each time the party on the other end replied "yes."
Maybe it comes down to different coverages under different Plans due to different payments, (or Group numbers). I can draw a parallel this way, my boss had his VSG surgery in December 2009 and it was approved and covered. I may need to call back and tape the conversation, but my intention now is to verify, verify, verify some way, since I will never consider the other options.