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. There is an infusion center in the same building.