Anxiety is highly prevalent among individuals with opioid dependence and confers greater risk for continued opioid use and poor treatment outcomes. However, there are currently no efficacious treatments available for co-occurring opioid dependence and anxiety. The ultimate aims of this trial are the development and testing of a novel integrated cognitive behavioral treatment (I-CBT) for co-occurring opioid dependence and anxiety disorders. This clinical trial consists of two phases: (1) open-trial pilot (2) randomized control trial. We hypothesize that I-CBT will be a feasible and acceptable treatment that will result in significant reductions in anxiety and opioid use.