US Core Data for Interoperability (USCDI)

The United States Core Data for Interoperability (USCDI) is a standardized set of health data classes and data elements, published and versioned by the ONC, that health IT must be able to exchange for nationwide interoperability. It defines what data (allergies, medications, problems, lab results, clinical notes, provenance, and more) must move; the US Core FHIR implementation guide defines how. USCDI expands on a predictable schedule, ratcheting the interoperability floor upward.