Thought I'd let y'all know what's happened with our case.
Those of you who said that a repeat sleep study is not necessary per Medicare guidelines are of course correct.
What happened is that the pulmonologist switched us to a different DME without really thinking it through. The new DME naturally said they need the original sleep study report. Rather than *look* at the original report
which we literally handed to her at our appointment, the doctor simply ordered a new sleep study. And as those of you following this thread know, the second sleep study fell just short of the AHI needed for a new machine. Had the doctor taken a little more care, she would have just sent the original sleep study to the new DME and never ordered another sleep study.
The person who actually straightened all of this out for us was the lovely angel nurse who does post heart attack follow-up phone calls during the first month of recovery. Hubs happened to mention the CPAP issue to her last week and she said "that doesn't sound right, let me see what I can do." She just called -- she's faxing the original sleep study to the DME we'd been using all along, and they will issue the replacement machine.
Time for a new pulmonologist.
Thanks to those of you who pointed out that hubby shouldn't have needed another sleep study. This was the first time one of us needed a new machine since going on Medicare, and we've now learned our lesson.