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README.md

File metadata and controls

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Codeable Concept Mapping

The mapping to / from the FHIR CodableConcept and HL7Concept Descriptor (CD) data types happens in serval places. Where stated in the documentation, the following method of mapping has been used.

XML HL7 > JSON FHIR

coding contains an array of provided code and code / translation elements.

Mapped to (JSON FHIR CodeableConcept) Mapped from (XML HL7 CD / other)
coding[].code code [@code] or code / translation [@code] 1
coding[].system `code [@codeSystem] 1,2
coding[].display `code [@displayName] 1,3
coding[].extension[0].url fixed value = "https://fhir.nhs.uk/STU3/StructureDefinition/Extension-coding-sctdescid" 1,4
coding[].extension[0].extension[0].url fixed value = "decriptionId" 1,4
coding[].extension[0].extension[0].valueId found by searching the adaptors SNOMED database for the preferred description ID 1,4
coding[].extension[0].extension[1].url fixed value = "descriptionDisplay" 1,4
coding[].extension[0].extension[1].valueString found by searching the adaptors SNOMED database for the preferred description 1,4
text code [@displayName] or else code / originalText
  1. If no codes are found then code.coding will not be populated.
  2. If this is a Read V2, Read V3 or SNOMED code system then it will be mapped to its corresponding code system reference. If there is no corresponding code system reference, and this is an OID (i.e. 1.2.3.4.5.6) then this will be presented as a URN and prefixed with urn:oid:.
  3. If this is a SNOMED code it is found by searching the adaptors SNOMED database for the appropriate description.
  4. If this is a not a 'SNOMED' code the extension will not be added

JSON FHIR > XML HL7

Mapped to (XML HL7 CD) Mapped from (JSON FHIR / other source )
code [@code] 5 coding.extension\[index].value where coding.extension[index].url equals "descriptionId" or else coding.code
code [@codeSystem] 5 fixed value = "2.16.840.1.113883.2.1.3.2.4.15"
code [@displayName] 5 coding.extension[index].value where coding.extension[index].url equals "descriptionDisplay" or else coding.display
code / originalText coding.text or else coding.display or else coding.extension[index].value where coding.extension[index].url equals "descriptionDisplay"
  1. If no SNOMED code is present, the code element will only have the attribute nullFlavor="UNK" i.e. unknown.