Objective: To understand differences in financial performance, quality performance, supplemental benefits provision, and enrollee composition between integrated and non-integrated plans in the Medicare Advantage (MA) program.Data Sources: We used data from the Center for Medicare and Medicaid Services for 2015-2017. We included 156 integrated MA plans (31 unique contracts) and 2096 non-integrated MA plans (392 unique contracts).Study Design: We estimated linear probably models for financial performance, quality performance, supplemental benefits provision, and enrollee composition with state fixed effects and contract random effects. We adjusted for county-level market structure-related factors, cost-related factors, and demand-related factors. Our primary independent variable was an indicator of plan-provider integration.