Cypress is the open source, rigorous and repeatable testing tool of Electronic Health Records (EHRs) and EHR modules in calculating eCQMs used by CMS’s Promoting Interoperability programs. It is available for use or adoption by the health IT community including EHR vendors and Authorized Testing Labs. Cypress serves as the official testing tool for the EHR Certification program supported by the Office of the National Coordinator for Health IT (ONC).