A set of health care services that must be covered by Affordable Care Act approved plans. The ACA dictates all major medical plans offered in the individual and small group market, both on and off exchange, must offer a comprehensive package of health items and services. Essential health benefits must include items and services within at least the following 10 categories: ambulatory patient services, emergency services, hospitalization, maternity and newborn care, mental health and substance abuse services, prescription drugs, rehabilitative services and devices, laboratory services, preventive and wellness services and chronic disease management, and pediatric services, including oral and vision care.