Thanks Sue. I know so little about Part D and where to start. So when you say contact Insmed to find out which companies do you mean which insurance might best cover it under part D? Who do you go through the approval process with for the exception? Your Part D insurer? I would not want to sign up for a plan only to find it did not cover the one drug I may end up trying. I would want to know in advance but is that possible?? I may not be making sense but like I said I know little about part D.