@susie333, You have some good questions but I'm not sure what the answers are for sure. It sounds like you were already diagnosed with sleep apnea and using a Phillips CPAP that was recalled and you are still waiting for a replacement. I registered 2 Phillips CPAPs for the recall, a Dreamstation and a Dreamstation Go portable CPAP. I stopped using both of them shortly after the recall notice went out and I went back where I purchased the Dreamstation through Medicare which was Mayo Clinic Rochester. My Phillips CPAP was 2 years old and was already paid for through a Medicare contract. I ended up paying out of pocket for a new ResMed AirMini CPAP which I really like.

I'm not sure what the Medicare policy is but I would recommend going to the medical store where you purchased the CPAP since they will have your prescription and info and can probably help you deal with Medicare. Here's some Medicare information on CPAP coverage but it doesn't have too many details -- https://www.medicare.gov/coverage/continuous-positive-airway-pressure-devices.

What does your sleep medicine doctor say, have you discussed it with them?

My guess is that Medicare will okay a new machine, but they are months behind in manufacturing them, now. Contact your CPAP supplier? Sometimes the Drs are able to make things happen a little better. Do make sure they prescribe a humidifier for your new one.