My doctor is an infectious disease doc. I had a GI at first, but he up and left the practice and went "who knows where". The infectious doctor was referred and I've been happy.
Sometimes we are limitied to a smaller variety of medical choices, whether it's due to insurance limitation, geography or availability. If the Infectious doc is the one you make an appointment with there is no problem in sort of 'interviewing' him. If you're comfortable, you might inquire if he treats a large number of hcv patients, what his thoughts are on treatment protocols, view on the use of rescue drugs, frequency of lab work and so one. It's important to be confident as possible in your medical care for hcv. The time and effort in tx is a huge investment and requires careful consideration on your part. Good luck.