PMID: 18180465Jan 9, 2008Paper

The effect of the Medicare Part D prescription benefit on drug utilization and expenditures

Annals of Internal Medicine
Wesley YinG Caleb Alexander

Abstract

Information about the effect of the Medicare Part D Prescription Drug Benefit on drug utilization and expenditures is limited. To estimate changes in prescription utilization and out-of-pocket expenditures attributable to Part D among a sample of persons eligible for the benefit. Generalized estimating equations were used to estimate changes in expenditures and utilization among beneficiaries. A control group was included to control for secular trends unrelated to the Part D benefit. National pharmacy chain representing approximately 15% of all U.S. retail pharmacy sales. Persons age 66 to 79 years (those eligible for Part D) and a control group of persons age 60 to 63 years (those ineligible for Part D). The final sample represented approximately 5.1 million unique beneficiaries and 1.8 million unique control individuals. Prescription utilization (measured in pill-days) and out-of-pocket expenditures, as determined from pharmacy claims from September 2004 to April 2007. During the penalty-free Part D enrollment period (January 2006 to May 2006), average monthly drug utilization increased by 1.1% (95% CI, 0.5% to 1.7%; P < 0.001) and out-of-pocket expenditures decreased by 8.8% (CI, 6.6% to 11.0%; P < 0.001). After enrollment s...Continue Reading

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