I just had my surgery on the 21st, and I went through Cigna.
My doctor handled all of the preliminaries, I'll admit, but I was going through the bariatric surgeon to begin with, and he knew what they needed. I will say this, Cigna only required a 3-month medically assisted weight loss (I went through my endocrinologist) in which I could show that I was losing weight, if only a pound, between visits. It was tough. My doctor also had me go though a lot more, which I don't know if they were requirements for the insurance or his MO. I had to undergo a sleep study, a psych evaluation, an endoscopy, a visit with a nutritionist, a whole round of bloodwork and pap smear, mammogram, and clearance from a cardiologist.
Not sure if this helps or not, but I'm sure that if you call some bariatric surgeons in your area, they'll be able to check for you. I know mine has a couple of women dedicated just to insurance verification/communication. My advice is to let someone who knows what the insurance companies typically ask for and who has experience in dealing with them do the legwork if you can. If there is no one nearby, maybe go to someone in a bigger city nearby. (I was fortunate enough to already live in a big city, so I didn't have to do much digging.)
I hope all of this helps. Let me know if you need anything else from me.
I wish you the best! ❤️