Insurer Retention of Stand-Alone Part D Plan Enrollees Switching to Medicare Advantage

This cross-sectional study quantifies the extent to which Medicare beneficiaries who switched from stand-alone prescription drug plans to Medicare Advantage plans stayed with the same insurer.

Corresponding Author: J. Michael McWilliams, MD, PhD, Department of Health Care Policy, Harvard Medical School, 180 Longwood Ave, Boston, MA 02115 (mcwilliams@hcp.med.harvard.edu).

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