The purpose of this study is to develop a CBT-D intervention tailored to meet the needs of MMT patients undergoing antiviral treatment for hepatitis C. In the first phase of this project (Year 1), we will develop and pilot the intervention with 20 patients. In the second phase of the project (Years 2 and 3), we will conduct a preliminary, randomized trial with 60 MMT patients to examine the efficacy of the CBT-D intervention relative to standard care condition (SC).