v3 Code System NullFlavor

{
  "description" : " A collection of codes specifying why a valid value is not present.",
  "compose" : {
    "exclude" : [ ],
    "include" : [ {
      "system" : "http://terminology.hl7.org/CodeSystem/v3-NullFlavor"
    } ]
  },
  "date" : "2018-08-12",
  "meta" : {
    "lastUpdated" : "2018-08-12T00:00:00.000+10:00",
    "profile" : [ "http://hl7.org/fhir/StructureDefinition/shareablevalueset" ]
  },
  "publisher" : "HL7, Inc",
  "name" : "v3.NullFlavor",
  "experimental" : false,
  "resourceType" : "ValueSet",
  "title" : "v3 Code System NullFlavor",
  "extension" : [ {
    "valueCode" : "external",
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status"
  }, {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
    "valueInteger" : 0
  }, {
    "valueCode" : "vocab",
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg"
  }, {
    "url" : "http://health-samurai.io/extensions/source",
    "valueCode" : "db"
  } ],
  "status" : "active",
  "id" : "v3-NullFlavor",
  "url" : "http://terminology.hl7.org/ValueSet/v3-NullFlavor",
  "identifier" : [ {
    "system" : "urn:ietf:rfc:3986",
    "value" : "urn:oid:2.16.840.1.113883.1.11.10609"
  } ],
  "immutable" : true,
  "version" : "2018-08-12",
  "contact" : [ {
    "telecom" : [ {
      "system" : "url",
      "value" : "http://hl7.org"
    } ]
  } ]
}