This week, our In Focus section reviews updated information issued by the Department of Health & Human Services (HHS) Centers for Medicare & Medicaid Services (CMS) on Medicaid expansion enrollment from the “September 2018 Medicaid and CHIP Application, Eligibility Determination, and Enrollment Report,” published on November 30, 2018. Additionally, we review 2018 Exchange enrollment data from the “Health Insurance Marketplaces 2018 Open Enrollment Period: Final State-Level Public Use File,” published by CMS on April 3, 2018. Combined, these reports present a picture of Medicaid and Exchange enrollment in 2018, representing 73 million Medicaid and CHIP enrollees and nearly 12 million Exchange enrollees.