The identity of an individual who receives health services is crucial to enabling health care record sharing across institutions and systems. Yet, sharing health care records can be a challenge in a complex environment where there are multiple systems across multiple health care institutions and each institution and/or system has a different way to identify their clients. Even in environments where citizens are assigned national identification cards, there is a need to ensure the unique identity of an individual among the myriad fragmented information systems that collectively represent a person’s electronic health record. The Client Registry is designed to assist in uniquely identifying individuals who receive health care services by: - Maintaining a central registry of all patients and their demographics and assigning a unique identifier to each patient. - Linking patient registration entries that result due to changes in patient demographics (patient moved to another location), data entry errors during patient registration, or missing demographic information. - Enabling health care workers to identify facilities at which a patient has received care. More information: https://guides.ohie.org/arch-spec/openhie-component-specifications-1/client-registry