United Health
I don't know about united health personally, but feel free to be proactive and calling them yourself to get the ball rolling faster. But be prepared that they may deny you at first, have your surgeon turn in a medical necessity form, there may even need to be a peer to peer review that your surgeon will have to talk to the doctor in charge of your case at the insurance company just be persistent!! My surgeon had to do a peer to peer review for my conversion from band to bypass after the insurance co initially denied the claim.