This brief was made possible with support from the Annie E. Casey Foundation and technical assistance through the Early Childhood Data Collaborative at Child Trends. This research has built upon work funded by the W.K. Kellogg Foundation in implementing the Mississippi Data Project (msdataproject.com). Together, this support has allowed researchers at Mississippi KIDS COUNT to conduct a study on school readiness of children enrolled in Mississippi's Medicaid Program. This brief provides information on the characteristics of kindergarten students enrolled in Medicaid, their participation in Medicaid's EPSDT program, and their level of kindergarten readiness. (author abstract)