This guide presents an overview of Medicaid's health programs for children: the Early and Periodic, Screening, Diagnostic, and Treatment (EPSDT) program. Written primarily for Head Start Programs that are interested in increasing access to preventive and treatment services for their Medicaid-eligible children, the purpose of this guide is to encourage and assist Head Start local education agencies, state and local health agencies, and other health and social service entities in becoming actively involved in their State EPSDT programs by using Head Start setting as one resource in a total system of health care. In addition, readers may use this guide to provide assistance to Medicaid agencies and Head Start programs interested in developing effective models for providing EPSDT outreach, case management, and service delivery. This guide is divided into four chapters. Chapter 1 presents an overview of the Medicaid system. Chapter 2 outlines EPSDT program activities such as screening services and continuing care. Chapter 3 discusses Head Start's roles in EPSDT, emphasizing outreach, case management, and service delivery. Chapter 4 provides examples of program linkages in Texas, Maine, Minnesota, Ohio, and Arkansas, and provides a comparison of these linkages to help Head Start programs understand the alternatives which may be available to them through the Medicaid program. Contains an appendix of regional contacts and state contacts. (MOK)