Health systems have increasingly developed integrated Medicare Advantage (MA) plans to align financial incentives and improve coordination of care and services across payer and provider. However, little is known about integrated MA plans' effects on patient outcomes and care processes. We used 2015 MA hospitalization data to assess whether these new models are associated with differences in the processes that take place during hospitalizations and to differences in patient outcomes. We found that enrollees who received care in a fully integrated context were less likely to disenroll from Medicare Advantage or switch MA plans and had marginally lower adjusted mortality rates, compared to enrollees hospitalized in less integrated settings-with no differences in readmissions between the two groups. The fully integrated enrollees also acquired more diagnoses but were less often admitted to the ICU compared to other patients admitted to the same hospitals. As the number of these arrangements continues to grow, the potential advantages of coordination may need to be balanced against the increased cost to Medicare associated with apparently more diagnostic complexity.
Keywords: Disenrollment; Health care providers; Health policy; Integration; Intensive care units; Markets; Medicare Advantage; Medicare Provider, Analysis, and Review; Medicare savings program; Payment; Populations; Traditional Medicare; Upcoding.