Teneil Brown

Supplement 1. eTable 1. Sample Size and Unadjusted MA Plan Disenrollment Rates, Before and After 2019, by Number of New Complex Conditions Developed in 2019 eTable 2. Beneficiary Characteristics in Patients with and without New Complex Conditions in 2019, 2018 eTable 3. Sensitivity of Difference-in-Differences Estimates, Controlling for Changes in Other Chronic Conditions eFigure 1. Event Study Regression of Any Switch eFigure 2. Disenrollment Following New Complex Conditions, by Condition eFigure 3.

Conflicts of Interest The authors declare no conflicts of interest. Data Availability Statement The data that support the findings of this study are available from the Centers for Medicare & Medicaid Services. Restrictions apply to the availability of these data, which were used under a data use agreement. Data are available from the Centers for Medicare & Medicaid Services through a data use agreement.