I am trying to navigate IVIG for CIDP and Medicare coverage. My wife has a Medicare Advantage plan that she signed up for when she was declared disabled a couple of years ago. She is turning 65 in a few months and I would like to have her change to original medicare and a supplement plan like I currently have. She gets IVIG infusions every three weeks Gamunex-C. The infusion is done at her doctors office (they have a room with a few chairs for infusions) It is being billed under Part D and we are receiving copay help from the pharmacy that is providing the drug. What steps would she have to take in order to get coverage under Part B.