Also ask if you can switch to another, perhaps even an Internet provider, without losing benefits.
My insurance company (Aetna) was EXTREMELY good about this, even giving me another (mail order) DME to use if I had trouble with the local.
(Aetna also authorized a NEW MASK months before it was due when I explained the mask given to me was unusable by me.)
Sleep study AHI: 49 RDI: 60 -- APAP 10-11 w/AHI: 1.5 avg for 7-days (up due likely to hip replacement recovery)
"We can all breathe together or we will all suffocate alone."