Resources

Measurement

Proportion of Days Covered (PDC) as a preferred method of measuring medication adherence

David P. Nau of the Pharmacy Quality Alliance compares the Medication Possession Ratio with the Proportion of Days Covered and explains how the PDC is calculated and used.

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Medication adherence measures and weightings in Medicare Part D Plan ratings

The Pharmacy Quality Alliance explains the medication quality measures in CMS Medicare plan ratings.

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