I would get on the horn with medicare. My first go-to is always directly my insurance to get things straightened out. Before I had decent insurance I was able to get a few procedures through state sponsored programs donated to me. Maybe your doctor has heard of such a thing and participates in this? If not maybe they know of one or where to refer you. Try a state health clinic or low income health clinic for the best resources on how to find such things. I know that the legwork on this sort of thing takes a lot out of you (it sure did me!) but it can be worth it in the end.