Inclusion Criteria:  For PCPs: (1) physician, nurse practitioner, or physician's assistant in any area within primary care; (2) in possession of valid DATA-2000 waiver; (3) currently treating more than two patients with OUD using oral buprenorphine-naloxone product; (4) willing to distribute study materials to their patients describing the research and providing options for their participation. For patient participants: (1) diagnosed and treated using MAT within primary care setting (i.e., family medicine, internal medicine, adolescent medicine, pediatrics, obstetrics/gynecology, geriatrics, infectious diseases, emergency department, non-cancer pain management  Exclusion Criteria:  For PCPs: (1) specialization outside primary care (e.g., psychiatry, neurology, etc) or provider works in specialized setting (e.g., addiction treatment programs; mental health clinic); (2) not treating patients with OUD with oral buprenorphine-naloxone product (e.g., long-acting naltrexone or buprenorphine injections); (3) Individual interviews with physicians and their patients to discuss initially barriers and challenges to MAT for patients with OUD seen in primary care settings. For patient participants: (1) MAT delivered in specialty care settings (i.e., psychiatry, substance abuse treatment programs).