procedure_occurrence

One FHIR Procedure maps to one procedure_occurrence row. Domain routing may redirect codes with non-Procedure domain_id to drug_exposure, device_exposure, measurement, or observation. Only completed procedures should produce rows. performed[x] is polymorphic (dateTime or Period) and at least procedure_date is required -- skip the resource if no date is available.

When a DiagnosticReport's LOINC code resolves to an OMOP concept with domain_id = Procedure, the report produces one or more procedure_occurrence rows. This occurs primarily for imaging studies (radiology, nuclear medicine), pathology procedures, and certain clinical assessments whose LOINC codes are classified in the Procedure domain by the OMOP vocabulary. Each conclusionCode entry generates a separate row. This is independent of the Observation results referenced by DiagnosticReport.result[], which are mapped by the Observation mapper.