{
  "package" : "hl7.fhir.r4.core@4.0.1",
  "definition" : "The content is greater than zero, but too small to be quantified.",
  "system" : "http://terminology.hl7.org/CodeSystem/v3-NullFlavor",
  "property" : [ {
    "_uri" : "http://hl7.org/fhir/concept-properties#parent",
    "code" : "parent",
    "_implicit" : true,
    "valueCode" : "UNK"
  } ],
  "codesystem" : "6f819d30-3400-5f76-8b7a-ac265f94fe3b",
  "concept_id" : "1111cfed-f5d6-5604-9046-399b68fccff1",
  "ancestors" : {
    "NI" : 2,
    "TRC" : 0,
    "UNK" : 1
  },
  "id" : "03cac45c-b459-4955-805b-edaac17facaa",
  "code" : "TRC",
  "display" : "trace",
  "version" : "2018-08-12"
}