By the numbers. A majority of unsubsidized seniors with prescription drug coverage are enrolled in HMOs.
Welch
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WP
D000368:Aged; D003625:Data Collection; D005260:Female; D006279:Health Maintenance Organizations / Q000706:statistics & numerical data*; D006801:Humans; D019458:Insurance Coverage / Q000706:statistics & numerical data; D007356:Insurance, Pharmaceutical Services / Q000706:statistics & numerical data*; D008297:Male; D020398:Medicare Part C; D014481:United States