FHIR Coding Data Type (R4)

Coding is a single code from a code system: system, version, code and display. Element table, example JSON and FHIRPath for FHIR R4.

Overview

Coding is a single code from a code system: system, version, code and display. It appears inside CodeableConcept.coding and directly as a few elements such as Encounter.class in R4.

Elements

Element	Type	Cardinality	Description
Coding.system	uri	0..1	Identity of the terminology system
Coding.version	string	0..1	Version of the system - if relevant
Coding.code	code	0..1	Symbol in syntax defined by the system
Coding.display	string	0..1	Representation defined by the system
Coding.userSelected	boolean	0..1	If this coding was chosen directly by the user

Example JSON (R4)

{
  "system": "http://loinc.org",
  "code": "8480-6",
  "display": "Systolic blood pressure"
}

FHIRPath

Observation.code.coding.system — Systems used
Observation.code.coding.code — All codes

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