drug_exposure

One FHIR Immunization maps to one drug_exposure row. Immunizations are point-in-time events: start_date = end_date, no days_supply or refills. Records are distinguished from other drug exposures by drug_concept_id belonging to the CVX vocabulary. Only completed immunizations are mapped; entered-in-error and not-done are skipped.

The FHIR Medication resource is a vocabulary/codeable-concept resource, not a medication event. It does NOT directly produce a drug_exposure row. Instead, its code and ingredient data are resolved into drug_concept_id and drug_source_value on drug_exposure rows produced by the four event resources (MedicationRequest, MedicationDispense, MedicationAdministration, MedicationStatement). This edge documents how Medication fields contribute to drug_exposure columns when referenced.

Inpatient medication administration events. Each MedicationAdministration produces one drug_exposure row distinguished by drug_type_concept_id = 38000179 (Physician administered drug). MedicationAdministration carries the richest route and dose-event timing information of the four medication resources.

Pharmacy dispensing events. One FHIR MedicationDispense produces one OMOP drug_exposure row with drug_type_concept_id = 38000175 (Prescription dispensed in pharmacy). Date is taken from whenHandedOver (fallback whenPrepared). End date is computed from start + daysSupply, or defaults to start date. No reviewed reference implementation covers this mapping; the spec is reconstructed from OMOP drug_exposure schema and FHIR R4 MedicationDispense definition.

Prescription/order stage of the medication lifecycle. One FHIR MedicationRequest maps to one OMOP drug_exposure row. MedicationRequest is the richest of the four FHIR medication-event resources for OMOP purposes because it carries dispense, refill, and supply-duration metadata that the other three lack. Type concept 38000177 (Prescription written).

Patient self-reported medication events. Each MedicationStatement produces one drug_exposure row with drug_type_concept_id defaulting to 44787730 (Patient Self-Reported Medication). This is the only FHIR medication resource with a normative HL7 IG FML mapping. Dynamic type concept adjustment is possible based on basedOn/partOf references (omoponfhir behavior).