I wonder if my insurance covers weight loss

I know my insurance does cover weight loss if it's medically necessary. But what if it's just cosmetic? I'm overweight but I'm not obese. I don't know if surgery would be something for me to consider or not. If my insurance covers it, I would be more likely to get it done. Especially since lap-band surgery is adjustable and reversible. Somewhere that puts my comfort first is the kind of place for me.