Pono,
I spoke to Humana's specialty pharmacy about this a while back - they only have allocations for certain types of IVIG - but - if they have what you need AND you are classified under Medicare rules as homebound - they said they could get home health to come out and give the infusions..... I'd give them a call - the name of their pharmacy is escaping me right now but call the number on your Plan D card and ask for someone who deals with specialty meds - you'll probably be on hold for a while but be persistent - they have a lot of people in the same boat!
Also, if you are dual eligible and you have the low cost co-pay - then your home visit for the med - which is usually billed at about $2,000 just for the IVIG itself - will be minimal... and Medicare/Medicaid should cover the home health portion...
Sounds like your doc really needs to get their request to the ins. correct - I truly never had a problem getting the med approved at all (the docs office did it within a couple of days)
Take care,