{

"resourceType": "CodeSystem",
"id": "data-absent-reason",
"meta": {
  "lastUpdated": "2019-11-01T09:29:23.356+11:00"
},
"extension": [
  {
    "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode": "oo"
  },
  {
    "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
    "valueCode": "normative"
  },
  {
    "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-normative-version",
    "valueCode": "4.0.0"
  },
  {
    "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
    "valueInteger": 5
  }
],
"url": "http://terminology.hl7.org/CodeSystem/data-absent-reason",
"identifier": [
  {
    "system": "urn:ietf:rfc:3986",
    "value": "urn:oid:2.16.840.1.113883.4.642.4.1048"
  }
],
"version": "4.0.1",
"name": "DataAbsentReason",
"title": "DataAbsentReason",
"status": "active",
"experimental": false,
"date": "2019-11-01T09:29:23+11:00",
"description": "Used to specify why the normally expected content of the data element is missing.",
"caseSensitive": true,
"valueSet": "http://hl7.org/fhir/ValueSet/data-absent-reason",
"content": "complete",
"concept": [
  {
    "code": "unknown",
    "display": "Unknown",
    "definition": "The value is expected to exist but is not known.",
    "concept": [
      {
        "code": "asked-unknown",
        "display": "Asked But Unknown",
        "definition": "The source was asked but does not know the value."
      },
      {
        "code": "temp-unknown",
        "display": "Temporarily Unknown",
        "definition": "There is reason to expect (from the workflow) that the value may become known."
      },
      {
        "code": "not-asked",
        "display": "Not Asked",
        "definition": "The workflow didn't lead to this value being known."
      },
      {
        "code": "asked-declined",
        "display": "Asked But Declined",
        "definition": "The source was asked but declined to answer."
      }
    ]
  },
  {
    "extension": [
      {
        "url": "http://hl7.org/fhir/StructureDefinition/codesystem-concept-comments",
        "valueString": "Using \"masked\" may be breach of security or confidentiality, but there are times when its use is required to support alternate workflows for gaining access to denied information."
      }
    ],
    "code": "masked",
    "display": "Masked",
    "definition": "The information is not available due to security, privacy or related reasons."
  },
  {
    "code": "not-applicable",
    "display": "Not Applicable",
    "definition": "There is no proper value for this element (e.g. last menstrual period for a male)."
  },
  {
    "code": "unsupported",
    "display": "Unsupported",
    "definition": "The source system wasn't capable of supporting this element."
  },
  {
    "extension": [
      {
        "url": "http://hl7.org/fhir/StructureDefinition/codesystem-concept-comments",
        "valueString": "It may be linked by internal references (e.g. xml:id). This usually implies that the value could not be represented in the correct format - this may be due to system limitations, or this particular data value."
      }
    ],
    "code": "as-text",
    "display": "As Text",
    "definition": "The content of the data is represented in the resource narrative."
  },
  {
    "code": "error",
    "display": "Error",
    "definition": "Some system or workflow process error means that the information is not available.",
    "concept": [
      {
        "extension": [
          {
            "url": "http://hl7.org/fhir/StructureDefinition/codesystem-concept-comments",
            "valueString": "This is sometimes an output value from measuring devices."
          }
        ],
        "code": "not-a-number",
        "display": "Not a Number (NaN)",
        "definition": "The numeric value is undefined or unrepresentable due to a floating point processing error."
      },
      {
        "extension": [
          {
            "url": "http://hl7.org/fhir/StructureDefinition/codesystem-concept-comments",
            "valueString": "This is sometimes an output value from measuring devices."
          }
        ],
        "code": "negative-infinity",
        "display": "Negative Infinity (NINF)",
        "definition": "The numeric value is excessively low and unrepresentable due to a floating point processing error."
      },
      {
        "extension": [
          {
            "url": "http://hl7.org/fhir/StructureDefinition/codesystem-concept-comments",
            "valueString": "This is sometimes an output value from measuring devices."
          }
        ],
        "code": "positive-infinity",
        "display": "Positive Infinity (PINF)",
        "definition": "The numeric value is excessively high and unrepresentable due to a floating point processing error."
      }
    ]
  },
  {
    "code": "not-performed",
    "display": "Not Performed",
    "definition": "The value is not available because the observation procedure (test, etc.) was not performed."
  },
  {
    "extension": [
      {
        "url": "http://hl7.org/fhir/StructureDefinition/codesystem-concept-comments",
        "valueString": "This is most often associated with required bindings that do not include the actual code used, but may be used with other data types."
      }
    ],
    "code": "not-permitted",
    "display": "Not Permitted",
    "definition": "The value is not permitted in this context (e.g. due to profiles, or the base data types)."
  }
]

}