In this issue brief, MACPAC analyzed data from government sources to identify known instances of fraud, waste, and abuse, as well as issues impacting the integrity of the Medicaid program. The brief defines fraud, waste, and abuse and discusses measures of fraud, waste, and abuse in Medicaid. It provides an overview of program integrity responsibilities carried out by the federal government, states, and health plans. It concludes by identifying key issues impacting the integrity of the Medicaid program.