I had jaw surgery a few years ago under UHC, but not with Delta.

I learned very quickly that the right hand does not talk to the left hand in that company. The procedure was medically necessary (not sleep apnea, but still necessary), but was denied due to an exemption. We had addressed that in the pre-approval letter (this fell under the exemption to the exemption), which apparently they didn't even read. They just saw the procedure code and denied it. After many back-and-forths, they finally approved it. Went in, had surgery, and guess what? After the procedure, they denied payment...because there was an exemption. No matter how many times I pointed out their own policy that it was covered, they denied it.

It took about a year, going up about 4 levels in the appeals process and finally threatening to sue them before they finally paid out.

Every doctor or specialist I have ever gone to loathes UHC. They never have issue with other companies, just UHC.

Good luck.