An example to illustrate the extension which adds a SNOMED CT description ID to CodeableConcept

Table View

Condition.id[0]UKCore-Extension-CodingSCTDescId-Example
Condition.code[0].coding[0].extension[0].url[0]https://fhir.hl7.org.uk/StructureDefinition/Extension-UKCore-CodingSCTDescDisplay
Condition.code[0].coding[0].extension[0].value[0]Bronchial asthma
Condition.code[0].coding[0].extension[1].url[0]http://hl7.org/fhir/StructureDefinition/coding-sctdescid
Condition.code[0].coding[0].extension[1].value[0]301480018
Condition.code[0].coding[0].system[0]http://snomed.info/sct
Condition.code[0].coding[0].code[0]195967001
Condition.code[0].coding[0].display[0]Asthma
Condition.code[0].coding[0].userSelected[0]True
Condition.subject[0].reference[0]Patient/UKCore-Patient-RichardSmith-Example

XML View

<Condition xmlns="http://hl7.org/fhir">
    <id value="UKCore-Extension-CodingSCTDescId-Example" />
    <code>
        <coding>
            <extension url="https://fhir.hl7.org.uk/StructureDefinition/Extension-UKCore-CodingSCTDescDisplay">
                <valueString value="Bronchial asthma" />
            </extension>
            <extension url="http://hl7.org/fhir/StructureDefinition/coding-sctdescid">
                <valueId value="301480018" />
            </extension>
            <system value="http://snomed.info/sct" />
            <code value="195967001" />
            <display value="Asthma" />
            <userSelected value="true" />
        </coding>
    </code>
    <subject>
        <reference value="Patient/UKCore-Patient-RichardSmith-Example" />
    </subject>
</Condition>

JSON View

{
    "resourceType": "Condition",
    "id": "UKCore-Extension-CodingSCTDescId-Example",
    "code": {
        "coding":  [
            {
                "extension":  [
                    {
                        "url": "https://fhir.hl7.org.uk/StructureDefinition/Extension-UKCore-CodingSCTDescDisplay",
                        "valueString": "Bronchial asthma"
                    },
                    {
                        "url": "http://hl7.org/fhir/StructureDefinition/coding-sctdescid",
                        "valueId": "301480018"
                    }
                ],
                "system": "http://snomed.info/sct",
                "code": "195967001",
                "display": "Asthma",
                "userSelected": true
            }
        ]
    },
    "subject": {
        "reference": "Patient/UKCore-Patient-RichardSmith-Example"
    }
}