Central Interoperability Suite (CIS)
The IHS Central Interoperability Suite (CIS) is a group of applications that facilitate the presentation of visit data for patients, the secure messaging between provider and patient or between providers, the matching of patients with their data, and the exchange of visit data within and outside of the Indian Health System. The applications supporting these functions are the Personal Health Record (PHR), Direct Secure Messaging (Direct), the legacy Master Patient Index (MPI), the legacy Health Information Exchange (HIE) Repository, and the Four Directions Hub (4DH) with the new Patient Index and the Clinical Viewer.