To Switch or Be Switched: Examining Changes in Drug Plan Enrollment among Medicare Part D Low-Income Subsidy Enrollees
During the Medicare Part D annual enrollment period, people on Medicare can review and compare stand-alone prescription drug plans (PDPs) and Medicare Advantage plans and switch plans if they choose. Low-income beneficiaries who receive premium and cost-sharing assistance through the Part D Low-Income Subsidy (LIS) program have a subset of premium-free PDPs (benchmark plans) available to them, but can also choose to enroll in a non-benchmark plan and pay a premium. This analysis examines plan changes among LIS enrollees in PDPs between 2006 and 2010.