This booklet provides an overview of the Medicaid Early and Periodic Screening Diagnosis and Treatment program (EPSDT). In five brief sections the origins, operations, concepts, functions, and questions and answers about EPSDT are covered. Section I emphasizes that the EPSDT is a step toward a comprehensive health care system that combines outreach, supportive services, follow-up, and case management services for children of Medicaid-eligible families. A Medicaid EPSDT implementation timeline for the states is provided. Section II covers federal and state responsibilities and program planning and implementation. Section III defines the concepts of the program: early, periodic, screening, diagnosis and treatment. Section IV presents the rationale for the program. An inventory of common EPSDT screening procedures is included. Section V consists of questions and answers about EPSDT. (Author/RH)