v3 Code System NullFlavor

{
  "description" : " A collection of codes specifying why a valid value is not present.",
  "date" : "2018-08-12T00:00:00+10:00",
  "meta" : {
    "lastUpdated" : "2018-08-12T00:00:00.000+10:00"
  },
  "publisher" : "HL7, Inc",
  "content" : "complete",
  "property" : [ {
    "description" : "The concept identified is a child of the concept",
    "type" : "code",
    "code" : "child",
    "uri" : "http://hl7.org/fhir/concept-properties#child"
  }, {
    "description" : "The concept identified is a parent of the concept",
    "type" : "code",
    "code" : "parent",
    "uri" : "http://hl7.org/fhir/concept-properties#parent"
  }, {
    "description" : "A code that indicates the status of the concept",
    "type" : "code",
    "code" : "status",
    "uri" : "http://hl7.org/fhir/concept-properties#status"
  } ],
  "name" : "v3.NullFlavor",
  "experimental" : false,
  "resourceType" : "CodeSystem",
  "title" : "v3 Code System NullFlavor",
  "extension" : [ {
    "valueCode" : "normative",
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status"
  }, {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
    "valueInteger" : 5
  }, {
    "valueCode" : "pa",
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg"
  }, {
    "valueCode" : "4.0.0",
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-normative-version"
  }, {
    "extension" : [ {
      "valueString" : "concept",
      "url" : "path"
    }, {
      "url" : "count",
      "valueInteger" : 2
    } ],
    "url" : "http://health-samurai.io/extensions/excised-data"
  }, {
    "url" : "http://health-samurai.io/extensions/source",
    "valueCode" : "db"
  } ],
  "status" : "active",
  "hierarchyMeaning" : "is-a",
  "id" : "3ff62be2-0e61-4059-8034-d3b03b5c5589",
  "valueSet" : "http://terminology.hl7.org/ValueSet/v3-NullFlavor",
  "url" : "http://terminology.hl7.org/CodeSystem/v3-NullFlavor",
  "identifier" : [ {
    "system" : "urn:ietf:rfc:3986",
    "value" : "urn:oid:2.16.840.1.113883.5.1008"
  } ],
  "caseSensitive" : true,
  "version" : "2018-08-12",
  "contact" : [ {
    "telecom" : [ {
      "system" : "url",
      "value" : "http://hl7.org"
    } ]
  } ]
}