Source: Data for years 2006-2012, from Centers for Medicare & Medicaid Services, Office of Information Services: Data from the Part D Denominator File; data development by the Office of Information Products & Data Analytics; http://www.cms.gov/Research-Statistics-Data-and-Systems/Statistics-Trends-and-Reports/MedicareMedicaidStatSupp/Downloads/2013_Section14.pdf. Data for years 2013-2018, from Centers for Medicare & Medicaid Services, Medicare Enrollment Dashboard, https://www.cms.gov/Research-Statistics-Data-and-Systems/Statistics-Trends-and-Reports/CMSProgramStatistics/Dashboard.html
Notes: United States totals refer to enrollees residing in the 50 states, D.C., territories, and foreign countries. N/A denotes data is not available. Percents were calculated by AARP Public Policy Institute staff.
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