Table 1: The 10 Top-Selling Drugs in Medicare Part D Include Several Costly Medications to Treat Cancer, Diabetes, and Rheumatoid Arthritis

NOTE: Top 10 drugs with one manufacturer and no generic or biosimilar competitors, based on net total Part D spending, taking into account average rebates from Congressional Budget Office analysis of Part D spending data. SOURCE: KFF analysis of 2019 data from the CMS Medicare Part D Drug Spending Dashboard, 2020 release.