I have been using IVIG in such a manner since 2000. It is actually the typical manner in which IVIG is used in MG.

Every once in a while, the insurance company will try tactics like yours is doing now. My neuro simply appeals the decision with a letter and then the flow of IVIG continues.

It's too bad your doc is on such a long vacay. Hopefully he will take care of it quickly, and request an expedited ruling. I wish your dh good luck in the job hunt as well!

Keep us posted!