Have you contacted your insurance carrier to ask who IS in network?
That's how I learned which providers were in network.
This go round, I was able to talk to someone at QAS and at my insurance carrier to verify with each that QAS is in network.
Also, I believe that what Raytel predominantly does is to rent the unit to the patient, rather than selling you a monitor. If that's OK with you, fine.
When my husband was diagnosed with sleep apnea, he rented a CPAP machine via insurance. That company went out of network with his insurance carrier, and the machine had to go back and he had to find another company in network. Did that twice. Last time the insurance company finally bought the machine for him and he forked over a co-pay.