If most DME's do business similar to the one I have, the DME will have the credit card on file from the person using the machine and if Medicare or insurance fails to pay, that credit card is the fallback payment method. Even if the CPAP is not usable it's probably better to let the insurance company deal with paying for it than having the DME bill the end user. If you don't have a credit card on file with your DME, there's a pretty good chance you signed a legally binding agreement upon receipt of the CPAP that you'll agree to be billed if Medicare or insurance failed to do so.
My own DME told me that if I had a 'failed' CPAP device they were obligated to provide a loaner. In a sense the Philips CPAP's are failed units since they were deemed unusable by Philips. I don't know what other DME's would do, but under the circumstances a loaner seems reasonable and might be worth asking the DME if they do this rather than paying out of pocket to buy a replacement. There also has been mention of Medicare paying for a replacement if a CPAP has failed. My PCP also hinted this would likely be the case, but it may take some time for Medicare and insurance to get things sorted out.
I haven't stopped using my DreamStation and I have no intention of modifying it by attempting foam removal. If I had used a method of 'cleaning' (ozone) that exacerbated foam breakdown I'd be particularly concerned, but the environment my CPAP resides in is fairly moderate in temperature and humidity, so degradation of the foam would/should be quite slow. Any significant off-gassing has already occurred in the first few months I used the CPAP and now tapered off. The Canadians and the VA seemed to have made rational recommendations for continued usage. I haven't as off yet decided if I'll pursue a replacement CPAP or not, but the idea of a Resmed is appealing.
An example of foam degradation is the foam that was in one of my microphone cases that I opened up a few weeks ago. The microphone was bought in the 1995, so the foam is about 26 years old. It took a long, long time to get in its current state of mushy and crumbly. I probably last used this particular microphone 10-12 years ago and the foam at that time was still quite intact and solid. Present day foam chemistries should be better than they were 26 years ago, right?
![Image](https://i.imgur.com/35pQVWr.jpg)