MedicationAdministration

— maps to 1 OMOP table

OMOP Table	Status	Mapped
drug_exposure primary 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.	documented	23 fields	detail →

MedicationAdministration → OMOP Mapping

MedicationAdministration represents the inpatient administration stage of the medication lifecycle — a clinician giving a medication dose to a patient. It carries the richest route and dose-event timing information of the four medication resources.

Source FHIR Resource

FHIR Resource	Lifecycle Stage	OMOP target	OMOP type_concept_id
`MedicationAdministration`	Inpatient administration	`drug_exposure`	38000179 (Physician administered drug)

Target OMOP Tables

OMOP Table	Purpose	Required?
`drug_exposure`	One row per administration event	Yes
`drug_era`	Derived: continuous drug exposure periods	No — computed post-ETL
`dose_era`	Derived: continuous dose periods	No — computed post-ETL

Mapping Strategy

Date handling. effectiveDateTime (point in time) → start = end. effectivePeriod.start / effectivePeriod.end → start / end. omoponfhir's general rule: when effectiveDateTime is used, end = start.
Dosage / quantity. dosage.dose.value → OMOP quantity. ETL-German computes the mean of a Range if doseRange is used. ETL-German fans out one drug_exposure row per dosage entry (although MedicationAdministration has a single dosage).
Route. dosage.route → route_concept_id via SNOMED → OMOP Route domain lookup. MedicationAdministration carries the most reliable real-world route data among the four event resources.
Provider. performer[0].actor → provider_id.
Visit. context → visit_occurrence_id.
Medication resolution. Same strategies as MedicationRequest. See ../Medication/index.md.
Type concept. Constant 38000179 ("Physician administered drug"). fhir-to-omop-demo uses 32818 (EHR administration record). FhirToCdm/ETL-German use 32817 (EHR / CLAIM) universally.

Reference Implementations

ETL-German-FHIR-Core (OHDSI, Java) — MedicationAdministrationMapper.java. ATC vocabulary, dose form and route mapping, Range mean quantity, fan-out per dosage entry. Pre-indexes Medication resources via medication_id_map. Status: maintained.
fhir-to-omop-demo (jq) — MedicationAdministration.jq (59 lines). drug_type_concept_id = 32818 (EHR administration record). Pre-computed vocabulary concepts. Status: maintained.

Other implementations (omoponfhir, FhirToCdm, NACHC, HL7 IG, this project) do NOT cover MedicationAdministration.

Status in This Project

Not yet implemented. Listed in mapspec/Medication/index.md (legacy) "Status in This Project" as a planned mapper. route_concept_id lookup and dosage parsing helpers from src/mapper/medication.ts would be reusable.

Related Resources

../MedicationRequest/ — prescription/order stage.
../MedicationDispense/ — pharmacy dispensing stage.
../MedicationStatement/ — patient self-report stage.
../Medication/ — vocabulary/codeable concept resource (not an event).