codesystemDefinition
Declares a named reference to an external code system identified by a URI. An optional version specifier pins the code system to a particular release.
Examples
SNOMED CT code system
codesystem "SNOMED-CT": 'http://snomed.info/sct'
LOINC with a specific version
codesystem "LOINC": 'http://loinc.org' version '2.72'
Private code system
private codesystem "ICD-10-CM": 'http://hl7.org/fhir/sid/icd-10-cm'
EBNF
codesystemDefinition
: accessModifier? 'codesystem' identifier ':' codesystemId ('version' versionSpecifier)?
;