In 2004, the Accreditation Association celebrated 25 years of improving health care quality through accreditation.

The Accreditation Association for Ambulatory Health Care, also known as the AAAHC or the Accreditation Association, is a private, non-profit organization formed in 1979 to assist ambulatory health care organizations in improving the quality of care provided to patients. It accomplishes this by setting standards, measuring performance and providing consultation and education where needed. Accreditation is ultimately awarded to those organizations that are found to be in compliance with the Accreditation Association standards.