I move around a lot and have run into all kinds of weirdness when it comes to CPAP stuff. Any time you establish a new doc, if your CPAP prescription is more than 1-2 years old you need to do another sleep study, so I think I've done 6 different sleep studies over the years.

The other thing to remember about CPAP is that it's not just the machine, you have to get replaceable supplies - masks, air tubes, etc every so often.

While not nearly as bad as linked blog entry, my worst situation was with Kaiser in the SF Bay Area. I had gotten a CPAP through them and then a few years later moved to a different part of the Bay. I set up a new doc also with Kaiser, but the records don't easily transfer and since it's a different Kaiser respiratory team, I had to (of course) do another sleep study AND go through a CPAP orientation on how to use a CPAP despite me already owning and using a CPAP and just needing a new mask, etc.