The hemotologist will not treat
hepatitis C, only the blood issues of neutrophenia (low absolute neutrophils)
and anemia (not enough oxygen in the blood). My GI (gastroenerologist) wanted me to line up a hemotologist right from the start because he said it was hard to get into one on short notice when you really needed one, and for that, I was really grateful.
In my town hemotologists are associated with and work with the oncology department of the hospital.