A new Medicaid Analytic eXtract (MAX) chartbook summarizes the Medicaid program and the MAX data system. Developed for state Medicaid directors, policymakers, researchers, and others interested in the Medicaid program, the chartbook is a research tool and reference guide on Medicaid enrollees and their Medicaid experiences in 2008. It consists of illustrative graphs, descriptive text, and an extensive data appendix with summary national- and state-level information on enrollees' demographic and eligibility characteristics, Medicaid service use, and Medicaid expenditures in 2008, as well as trends in key enrollment and utilization patterns over time.