@wander - Yes, I agree, the Medicare waiver, along with the whole Medicare program, is complicated and hard to grasp. And the rules keep changing.
I've been told that it's better to go to the business office of your clinic for information about what Medicare covers in a particular situation. Often, your physician just isn't up to date on Medicare coverage.
As far as the waiver goes, it seems very unfair to leave the patient hanging. He has to decide whether to have the procedure with the possibility of being responsible for some big bills. Or, refuse treatment and then "who knows what."
I think that many improvements need to be made in the Medicare system. Nevertheless, it is a pretty good system and many Americans are thankful to have it.