CIEL is an open-source standardized terminology intended for use within health information systems, particularly OpenMRS. OpenMRS and CIEL are used by more than 50 LMICs across the globe, but particularly in Africa, Asia, and S. America. The common, multi-lingual concept dictionary allows for clinically-friendly data collection and then maps to standard reference terminologies such as SNOMED CT, ICD-10, LOINC, and RxNORM. CIEL updates the dictionary on a monthly basis and has been adding COVID-19-specific content since January 2020. The CIEL content supports the collection and reporting for the WHO eCRF, CDC PUI, and other public health and research use cases [1].

All source files can be obtained from the OHDSI GitHub.

All CIEL concepts, being mapped to Standard ones, are Non-standard.