ERP to Improve Functioning in Veterans With OCD

Inclusion Criteria: * Veterans having a primary diagnosis of Obsessive Compulsive Disorder (OCD)(50% of sample) and comorbid OCD and Post-traumatic stress disorder (PTSD) (50% of sample) who are receiving care from the Michael E. DeBakey VA Medical Center (MEDVAMC) in Houston, TX; the Ralph H. Johnson VA Medical Center in Charleston, SC; the VISN 20 Clinical Resource Hub which provides telehealth services to Washington, Oregon, and Alaska: the VISN 2 Clinical Resource Hub which provides telehealth services to New Jersey, New York, and northern Pennsylvania, and the VISN 6 Clinical Resource Hub which provides telehealth services to North Carolina and Virginia. * Willingness to participate in Exposure and Response Prevention(ERP) Exclusion Criteria: * Significant cognitive impairment or conditions that threaten safety (current psychosis, mania, imminent suicidality including plan or intent, and treatment-interfering moderate to severe substance use). * Potential participants taking psychotropic medications must be on a stable dose of these medications for at least 6 weeks prior to study enrollment.