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Health Aff (Millwood). 2009 Mar-Apr;28(2):w305-16. doi: 10.1377/hlthaff.28.2.w305. Epub 2009 Feb 3.

The effect of Medicare Part D coverage on drug use and cost sharing among seniors without prior drug benefits.

Author information

  • 1Division of Pharmacoepidemiology and Pharmacoeconomics at Brigham and Women's Hospital in Boston, Massachusetts, USA. sschneeweiss@partners.org

Abstract

This study evaluates the effect of Medicare Part D among seniors who previously lacked drug coverage, using time-trend analyses of patient-level dispensing data from three pharmacy chains. Of 114,766 seniors without drug benefits, 55 percent initiated drug insurance under Part D. After the penalty-free Part D enrollment period, use of statins, clopidogrel, and proton pump inhibitors stabilized at levels ranging from 11 percent to 37 percent above the trend that would have been expected if Part D had not been implemented. Patients reaching the Part D coverage gap (12 percent) experienced a decrease in essential medication use ranging from 5.7 percentage points per month for warfarin to 6.3 percentage points for statins.

PMID:
19189990
[PubMed - indexed for MEDLINE]
PMCID:
PMC2683877
Free PMC Article
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