Why OIG Did This Review. Dual eligibles - that is, beneficiaries who are covered by both Medicare and Medicaid - are a vulnerable population whose access to prescription drugs is particularly important. Overall, they have very low incomes and - because they are more likely to be in poorer health than other Medicare beneficiaries - tend to use more Medicare services.1 Because Medicare prescription drug coverage is an important tool for ensuring access to prescription drugs, Congress mandated that OIG study whether Part D formularies cover prescription drugs commonly used by dual eligibles. What OIG Did. For this report, we determined whether the 449 unique formularies used by the 5,288 Part D plans operating in 2022 cover 195 of the 200 drugs most commonly used by dual eligibles. See the methodology for more information about how we determined the most commonly used drugs. This is OIG’s twelfth annually mandated report examining dual eligibles’ access to drugs under Medicare Part D.
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