CMS has released the 2009 Part D national average monthly bid amount, the Medicare Part D base beneficiary premium, the Part D regional low-income premium subsidy amounts, and the Medicare Advantage regional benchmarks. In addition, CMS has issued guidance to clarify its “best available evidence” (BAE) policy, which requires Part D drug plan sponsors to establish the appropriate cost-sharing for low-income beneficiaries when presented with evidence that the beneficiary's information is not accurate.