I have found that if I call medicare and ask explicate questions , I get very clear answers. Think before you ask, so far this has worked. It may be because I am over 65, I don't know. Always get the name of the person you spoke with. I am not the one with PD in the family. I found out that I had spinal sneosis and had to have bone fragments as well as disk fragments removed. They were clear about what I should do and what should be done for me. It seems that they are amazingly efficient. Nita Andres