Cerner Corporation and Epic Systems have joined iPatientCare as CMS Designated Test EHR Program participants. The Office of the National Coordinator for Health Information Technology announced the two rival companies’ participation April 6. The CMS program, designed to test electronic data exchange capabilities, is voluntary. Since the Test EHR Program was launched just over a year ago, more than 4,000 providers have registered to conduct tests, and more than 5,000 have successfully attested to the transition of care meaningful use core objective, ONC notes. In the past the program also included MEDITECH and McKesson.