IDX Systems Corporation (IDX) was a healthcare software technology company that formerly had headquarters in South Burlington, Vermont, United States. It was founded in 1969 by Robert Hoehl, Richard Tarrant, and Paul Egerman. IDX was acquired by General Electric and incorporated into its GE Healthcare business unit in 2006. A portion of the former IDX business (along with other software assets) were sold by GE to private equity firm Veritas Capital in 2018. The resulting company was named Virence. In 2019, Virence was merged into athenahealth.