Medicare Part D plans offer prescription drug coverage to eligible patients. These are offered through private insurance companies that are contracted by Medicare, so costs and availability may differ between carriers and by location. Part D plans include the Prescription Drug Plans and Medicare Advantage Prescription Drug plans.
CMS releases summary Part C and Part D payment data after the reconciliation of Part C and Part D payments, as provided in 42 CFR
§422.504(n)(1) and 42 CFR §423.505(o)(1). Additional information on the summary Part C and Part D payment data that CMS releases, can be found in CMS April 15, 2011 final rule, “Medicare Program; Changes to the Medicare Advantage and the Medicare Prescription Drug Benefit Programs for Contract Year 2012 and Other Changes,” published in the Federal Register at 76 FR 21432. The categories of data are expressed at a summary level only. In addition, in instances where the level of aggregation identified in a data category was determined to be potentially insufficient to provide adequate protection against any disaggregation, such data is not included in said category. Any risk-adjusted payment is standardized to a 1.0 risk score, meaning that the included numbers are equal to the average risk-adjusted amount divided by the average risk score.