ONC, an acronym of Office of the National Coordinator for Health Information Technology, is a term used to refer to the entity that was created under the Health Information Technology for Economic and Clinical Health Act in 2009. The ONC, which is a division of the Department of Health and Human Services (HHS), is responsible for promoting the use of electronic health records (EHRs) by health care providers and ensuring the interoperability of health information systems. Synonyms for the term ONC include National Coordinator for Health IT, National Coordinator's Office, and the ONC for Health IT. Regardless of the term used, the ONC plays a vital role in the advancement of health information technology in the United States.