{
  "package" : "hl7.terminology.r4@6.3.0",
  "definition" : "The are no known applicable values in this context.",
  "system" : "http://terminology.hl7.org/CodeSystem/special-values",
  "property" : [ ],
  "codesystem" : "54a9dcd1-f17d-5f9f-9c2b-6b62bd67b287",
  "concept_id" : "7fa8010a-e84e-5c5d-8871-a2a1b0b2166c",
  "ancestors" : {
    "nil-known" : 0
  },
  "extension" : [ {
    "url" : "http://hl7.org/fhir/StructureDefinition/codesystem-concept-comments",
    "valueString" : "The existence of this subject to review"
  } ],
  "id" : "5078a085-e39b-43ba-9bdc-762207d0ed18",
  "code" : "nil-known",
  "display" : "Nil Known",
  "version" : "1.0.0"
}