Just for full comprehensiveness on insurance, even if insurance pays, lets just assume he picks an out of network doctor.. OP, if you pick in-network, ignore the following. His insurance will cover at an out of network rate, let's say 60%, of the allowed amount. That allowed amount can possibly be like 20-40% of the doctor's fee. Then chop like 40% off the allowed amount, and that is all insurance will pay towards the doctor's fee. So if you go to any of the schmucks with their 50-100 grand fee's, expect to pay the lions share anyways.
If you really want insurance coverage, then take the CPAP device after you're diagnosed with OSA, use it for a while and claim it's not working, can't be tolerated etc.. That might check off the box for insurance that less extreme measures were tried first. Don't take this as gospel, but that's just what I've been told.