I received IVIG for the first time 2 weeks ago. The first infusion center (Walgreens) said Medicare did not pay for it, even in the center. But that was wrong. (Maybe they didn't want to accept Medicare's mark-down of this expensive drug!). My neurologist's office found an infusion center (in Denver) that takes Medicare, and Medicare Part B definitely paid for it.

We are now at our winter home in Tucson, and I called around to find an infusion center, as I need another round. Every hospital I called knew who gives in-center IVIG for MG. I called that center, and they said of course Medicare Part B pays for it all the time.

I'm told Part D will pay for in-home infusions. I won't have Part D till Jan, 2014.
Hope this helps.
Nanegg