This study aims to describe the experience of implementing a psychosocial distress screening system for children with serious or chronic medical conditions. Achieving RoutIne Screening for Emotional health (ARISE) was developed to systematically evaluate psychosocial distress in children with serious medical or chronic medical illnesses, by integrating patient-reported outcome measures (PROM) into care delivery. ARISE was developed using a user-centered approach with extensive input from patients, families, and healthcare professionals to overcome barriers to routine PROM collection and integration into care as usual. It comprises a system to capture PROMs and then relay results to clinicians for changing care. We sought to implement ARISE at four subspecialty pediatric clinics caring for patients with cystic fibrosis, sickle cell disease, hemophilia, and neurological malignancy. Problems with acceptability, appropriateness, and feasibility represented barriers to implementation which were overcome by modifying the intervention using stakeholder input during the planning phase, leading to broad program acceptance. ARISE was implemented in three of the four clinics, in which 79.8% of eligible children and their family completed PROMs. The ARISE program demonstrated the feasibility and effectiveness of integrating psychosocial screenings into subspecialty pediatric clinics, thereby enhancing the identification and management of psychosocial issues in children with serious and chronic medical illnesses.