Just from my experience with my insurance, here is what I had to do:
I spoke to my PCP about it.... I was required to do 6 months monitoring weight loss and discussing nutrition/exercise with him. After 6 months, he sent report to insurance and request for referral to bariatric surgeon. Insurance approved, set up consultation. After consultation back to PCP to get EKG, xray, blood work, dr. release etc... then referral to psych... got psych eval done. all paperwork back to surgeons office. They are submitting it to insurance for final approval to set up surgery date (which i was informed will be in June)... I began everything in February again (I already did 6 mo. tracking, but then got pregnant and had a son in october... so I was able to use previous 6 mo but had to re-do the xray ekg, approval etc...)
So for me, I had to go thru PCP. I would def. bring it up to them :) GOOD LUCK!