http://hl7.org/fhir/StructureDefinition/cqf-modelInfo-primaryCodePath|5.2.0

Specifies the primary code path for the class constructed in the model info for the profile (i.e. the path to the code-valued element on the resource that should be used as the default terminology filter when no terminology target is specified in a CQL retrieve).
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.url.typehttp://hl7.org/fhir/StructureDefinition/uri
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/string