This is a prospective randomized controlled trial comparing two different clinic models for patients with hepatitis C. These patients commonly have mental health problems that are barriers to receiving HCV treatment. Patients giving informed consent will be randomized to a usual care HCV clinic vs. a HCV clinic with the addition of an on-site mental health practitioner who will address psychiatric and substance use issues with the goal of enabling patients to undergo effective antiviral therapy. The major outcome of the study is the number of patients in each group who are "cured" with antiviral therapy. Patients in both groups receive current standard of care.