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Health Serv Res. 2010 Apr;45(2):355-75. doi: 10.1111/j.1475-6773.2009.01071.x. Epub 2009 Dec 30.

Falling into the coverage gap: Part D drug costs and adherence for Medicare Advantage prescription drug plan beneficiaries with diabetes.

Author information

  • 1Division of Research, Kaiser Permanente Medical Care Program, 2000 Broadway, 3rd floor, Oakland, CA 94612, USA. Vicki.Fung@kp.org

Abstract

OBJECTIVE:

To compare drug costs and adherence among Medicare beneficiaries with the standard Part D coverage gap versus supplemental gap coverage in 2006.

DATA SOURCES:

Pharmacy data from Medicare Advantage Prescription Drug (MAPD) plans.

STUDY DESIGN:

Parallel analyses comparing beneficiaries aged 65+ with diabetes in an integrated MAPD with a gap versus no gap (n=28,780); and in a network-model MAPD with a gap versus generic-only coverage during the gap (n=14,984).

PRINCIPAL FINDINGS:

Drug spending was 3 percent (95 percent confidence interval [CI]: 1-4 percent) and 4 percent (CI: 1-6 percent) lower among beneficiaries with a gap versus full or generic-only gap coverage, respectively. Out-of-pocket expenditures were 189 percent higher (CI: 185-193 percent) and adherence to three chronic drug classes was lower among those with a gap versus no gap (e.g., odds ratio=0.83, CI: 0.79-0.88, for oral diabetes drugs). Annual out-of-pocket spending was 14 percent higher (CI: 10-17 percent) for beneficiaries with a gap versus generic-only gap coverage, but levels of adherence were similar.

CONCLUSIONS:

Among Medicare beneficiaries with diabetes, having the Part D coverage gap resulted in lower total drug costs, but higher out-of-pocket spending and worse adherence compared with having no gap. Having generic-only coverage during the gap appeared to confer limited benefits compared with having no gap coverage.

PMID:
20050931
[PubMed - indexed for MEDLINE]
PMCID:
PMC2838150
Free PMC Article

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