This week, our In Focus section reviews the Centers for Medicare & Medicaid Services (CMS) reports on Medicaid expansion enrollment and spending, published on a quarterly basis. CMS issues two reports on a quarterly basis, the first of which provides monthly enrollment broken down by category of enrollment, and the second of which provides quarterly Medicaid expenditures by category of enrollment. Although the data is not completed across all Medicaid expansion states, these reports allow for preliminary analysis of newly and previously eligible enrollments through the first quarter (Q1) of 2015, and of expenditures for these enrollment categories through Q3 2014.