Is it in writing that Remicade is an exclusion on your policy? Are they trying to say its experimental? Do you have a handbook that sets out what coverages are available and what they exclude?
My first phone call would be to State Board of Insurance in your state. Explain to them what is going on. They may send you a packet to file a complaint. By all means, fill out the paperwork and send it in. Keep a copy for your records.
Here in Tx my gi never had to call for approval. My infusions were done at the hospital as an OP and the hospital called for authorization.
Then I would make a couple of phone calls to some personal injury lawyers and ask them if the ins company can legally put you in the limbo they have. My thinking is they must either approve or deny, not sit in the middle of the fence twirling on their thumbs. Good luck, Susie