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Trends in Dual-Eligible Enrollees' Access to Drugs Under Part D, 2011-2025

Dual-eligible enrollees-that is, people enrolled in both Medicare and Medicaid—have received prescription drug coverage under Medicare Part D since 2006. As long as Part D plans meet certain limitations outlined in 42 CFR § 423.120, Part D sponsors have discretion to include different drugs in their formularies. This work will report trends in the extent to which formularies used by Part D plans included drugs commonly used by dual-eligible enrollees, which OIG has analyzed annually as required by law, from 2011 to 2025.

Announced or Revised Agency Title Component Report Number(s) Expected Issue Date (FY)
July 2025 CMS Trends in Dual-Eligible Enrollees' Access to Drugs Under Part D, 2011-2025 Office of Evaluation and Inspections OEI-05-25-00350 2025