GAO identified a gap in state and federal efforts to ensure Medicaid managed care program integrity. Federal laws require the states and the Centers for Medicare & Medicaid Services (CMS) to ensure the integrity of the Medicaid program, including payments under Medicaid managed care, which are growing at a faster rate than payments under fee-for-service (FFS). However, five state program integrity (PI) units and four Medicaid Fraud Control Units (MFCU) from the seven states included in GAO’s review said they primarily focus their efforts on Medicaid FFS claims and have not begun to closely examine program integrity in Medicaid managed care. In addition, federal entities have taken few steps to address Medicaid managed care program integrity.