Research has shown that early intervention can greatly improve the development of a child with autism. Children with disabilities--including children with autism--can receive intervention services through the Individuals with Disabilities Education Act. Low income children may also receive intervention services through Medicaid or the State Children's Health Insurance Program (CHIP)--health care programs overseen at the federal level by the Centers for Medicare & Medicaid Services and administered by the states. Children of service members may receive services through TRICARE, the Department of Defense's (DOD's) health care program. The Government Accountability Office (GAO) was asked to review federal autism efforts. This report describes how federal agencies encourage early autism identification and interventions and the intervention services provided by federal education and health care programs. It also examines steps taken by Health and Human Services (HHS) and federal agencies to improve research coordination. GAO collected information on education programs in five states that were selected for size, activities, and variation in geographic location. GAO analyzed health care program data: fiscal year 2014 TRICARE data and fiscal year 2013 Medicaid and CHIP data--the most recent data available at the time of the review--from another five states selected based on the availability of reliable data. GAO also monitored the implementation of its 2013 recommendations to improve autism research coordination. Education and HHS provided comments on a draft of this report and disagreed that there is potential for unnecessary duplication. GAO continues to believe improved coordination is needed. The following are appended: (1) Detailed Scope and Methodology for Analyzing Health Care Data; (2) Number of Children Age 3 through 5 in States' Special Education Autism Category; (3) Selected Federal Health Expenditures for Intervention Services Provided to Children with Autism; (4) Comments from the Department of Education; (5) Comments from Department of Health and Human Services; and (6) GAO Contact and Staff Acknowledgments. Contains a list of related GAO products.