Our proposed research is to investigate the relationship of social determinants of health on health care utilization and disease outcomes in children with Juvenile Idiopathic Arthritis (JIA) and childhood-onset systemic lupus erythematosus (cSLE), using the Cincinnati Children’s electronic medical record. We will measure the magnitude of health disparities in JIA and cSLE and identify drivers of these health disparities. Our work will provide important preliminary data as we plan to replicate our findings in the CARRA Registry and leverage existing networks (e.g., CARRA, PedsNET, Pediatric Rheumatology Care & Outcomes Improvement Network [PR-COIN]) to develop and refine interventions to address inequities locally and nationally. We have a racially and ethnically diverse multidisciplinary team where half of our members derive from historically underrepresented minorities in academia.