http://hl7.org/fhir/StructureDefinition/patient-preferenceType|5.2.0

Indicates what mode of communication the patient prefers to use for the indicated language.
typedestination
baseDefinitionhttp://hl7.org/fhir/StructureDefinition/Extension
typehttp://hl7.org/fhir/StructureDefinition/Extension
Extension.value[x].typehttp://hl7.org/fhir/StructureDefinition/Coding
Extension.value[x].binding.valueSethttp://hl7.org/fhir/ValueSet/language-preference-type