I too am on Medicare[original] and was slated for home infusion [for CIDP], which as you indicate falls under Plan D prescription. I held off treatment for a month to get a supplemental plan. My plan D would have covered the nurse part as a courtesy but i would have had a 35% co-pay. I never asked what that would be because of other issues with coverage that had to be resolved before scheduling home infusion. I had recently joined Medicare and dropped my private plan since i was paying all of the premium and Medicare had me as still have a primary private plan. Anyway I finally got it all straightened out and don’t have any out of pocket at this time. I get Gamumex-C infusion every 3 weeks from a local infusion center here in the Dallas/Fort Worth area of Texas. I’m fortunate in that they carry all the brands of immunoglobulin. I’m surprised there is not an infusion center near you that will order Gamumex-C. I will be moving to another state in a year or so so I better check out my options in the town i am going to. I hope you can find a way to move to infusion center so you don’t have that added expense as you learn to deal with this crappy disease.