
FHIR resource link	http://hl7.org/fhir/R4B/references.html http://hl7.org/fhir/R5/references.html
FHIR definition	A reference from one resource to another. It appears in different resources like QuestionnaireResponse
PSI use case
FHIR required properties	`reference`
PSI required properties*	-
Extensions	-
Sample payload (minimum set)	`"source": { "reference": "Patient/245", "type": "Patient" }`
Notes	Use always the `reference` field (instead of `identifier`)

Notes for Reference FHIR resource, per property

Property	Required by PSI?	Notes

Property	Required by PSI?	Notes
PSI tags	optional [psi/fhir]

FHIR