Here are the phone numbers:
800-387-1258 (Pegasys)
800-521-7157 (PegIntron)
When I wanted to extend my treatement from 48 to 72 weeks the insurance company refused to pay for it. I called the drug company drug assistance program and they asked me for the insurance letter denying coverage and then paid for every single bit of it for me - even mailed it to my house for free.
If you are on PegIntron it is called Commitment to Care
If you are on Pegasys it is called Pegassist
Google them and they should come right up. I don't have the numbers any longer cause I've been done for a long time but if you contact them more than likely they should be able to help you.
Good luck.