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Introduction Obstructive sleep apnea (OSA) is the second most common sleep disorder among Veterans and carries risk of serious health complications when untreated. The gold standard for OSA treatment is Positive Airway Pressure (PAP). However, adherence to PAP therapy is chronically low. Interventions to enhance adherence include education, practical support, and psychotherapy. Cognitive behavioral therapy and motivational interviewing have been shown to improve CPAP usage by approximately 1 hour per night. Telemedicine-delivered CPAP education and telemonitoring-with-feedback has demonstrated improved adherence in patients with OSA. Our study evaluated the effectiveness of a telemedicine group psychotherapy intervention for Veterans diagnosed with OSA and found to be nonadherent to CPAP therapy. The intervention is delivered in four weekly 60-minute sessions. Methods We identified a cohort of 29 patients who participated in the intervention via telemedicine from April 2020 - September 2020 (Telemedicine Psychotherapy cohort). The cohort was compared to a historical control of 35 patients who participated in the in-person group psychotherapy from April 2019 - September 2019 (In-Person Psychotherapy cohort). Through retrospective chart review, we analyzed baseline and post-intervention data from both cohorts. Demographics collected included age, sex, BMI, ethnicity, zip code, as well as medical and mental health comorbidities. Data collected from the medical record included: OSA severity, pre- and post-psychotherapy 90-day average nightly CPAP usage (in minutes), number of psychotherapy classes attended (out of 4) and number of sleep clinic visits at 90-days post-psychotherapy. We used descriptive statistics to provide summary data of this sample and t-test to evaluate Veteran’s average CPAP usage per night and number of sleep clinic visits at 90-days post-psychotherapy between cohorts. Results Compared to a cohort of in-person group psychotherapy to improve CPAP adherence, a telemedicine-based cohort demonstrated improvement in 90-day average nightly CPAP usage by an average of 76 minutes per night. (p=0.08) Additionally, patient engagement with the sleep clinic at 90 days following completion of telemedicine psychotherapy was significantly higher compared to in-person psychotherapy (p<0.001). Conclusion In a haphazardly-collected convenient sample of veterans during the COVID-19 pandemic, telemedicine psychotherapy led to improved CPAP usage. Veterans who underwent telemedicine intervention also significantly increased engagement with the sleep clinic. Support (if any):