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To request UCI Health electronic health records (EHR) data for quality improvement projects or according to IRB-approved research protocols, submit a Honest Broker Data Request. For inquiries, please email Andrea Hwang at ychwang@hs.uci.edu.

Limited Data Set (LDS) OMOP (Observational Medical Outcomes Partnership) Research Data Warehouse (RDW)


  • Contains the majority of structured EHR data from UCI Health
  • Can be used for research purposes without additional administrative or research ethics approval, provided that adequate data protection procedures are in place.

For more information, visit the Self-Service RDW webpage. Any UC Irvine employee or student can request access by sending an email to ori@uci.edu with the signed and attached LDS OMOP Data Use Agreement. For students, the faculty supervisor’s signature must be obtained.

University of California Health Data Warehouse (UCHDW)


UCHDW is a UC-wide data asset created to enhance operational improvements, promote quality patient care, and enable the next generation of clinical and translational research. It aggregates EHR data from the six UC academic health centers: UC Davis, UC Irvine, UCLA, UC Riverside, UC San Diego and UC San Francisco. It also includes claims data from the UC self-funded health plans, as well as from external sources including Vizient and the California Department of Health Care Access and Information (HCAI), formerly the Office of Statewide Health Planning and Development (OSHPD).

The LDS version of UCHDW is available for research reuse without requiring additional IRB approval. Currently, it contains only structured data; de-identified free-text notes are being added and are expected to be available for research reuse in late 2026. To request an account, you must first have access to UC Irvine's local LDS OMOP RDW and have used it for at least a month. Then you can email ori@uci.edu.

Contact the Office of Research Information at ori@uci.edu.

Watch the UCI Health's Data Research Resources webinar presented by Kai Zheng, PhD, on 1/23/2026.