We expect that, relative to the SC condition, participants randomized to the CBT-D condition will have decreased likelihood of depression-related antiviral treatment failure, will report lower levels of depressive symptoms, will complete more IFN injections, will have lower HCV RNA levels, and will have fewer illicit drug use days. If the efficacy of this intervention can be established in this trial and in subsequent clinical trials, MMT patients who elect to undergo antiviral therapy will have a valuable adjunct or alternative to the use of antidepressants to prevent depression. If found to be efficacious, this intervention will maximize the receipt of IFN treatment by MMT patients, thereby aiding in the prevention of liver failure, hepatocellular carcinoma, and liver-related death among those with HCV.