Medicare Part D
Part D is not the same as a drug administered in a doctor's office and paid as Part B. Those drugs often have HCPCS J codes and NDC crosswalk rows.
Source: CMS 2027 Part C and D Star Ratings data, released October 8, 2026.
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Definition · Medicare program and benefits
Medicare Part D
Medicare Part D is outpatient prescription drug coverage. It can stand alone or sit inside a Medicare Advantage plan. CMS rates the drug portion of contracts in the Star Ratings. The 2027 ratings file separates Part C and Part D scores when the contract has them. The ratings lookup is at /star-ratings-2027.
Questions
Medicare Part D, answered
Where do I see a contract's Part D score?
Open the contract page under /star-ratings-2027. The file's Part D column is shown when the contract has one.