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Source1

{
  "resourceType": "CodeSystem",
  "id": "reaction-event-certainty",
  "text": {
    "status": "generated",
    "div": "<!-- snip (see above) -->"
  },
  "extension": [
    {
      "extension": [
        {
          "url": "packageId",
          "valueId": "hl7.fhir.uv.xver-r4.r4b"
        },
        {
          "url": "version",
          "valueString": "0.0.1-snapshot-2"
        }
      ],
      "url": "http://hl7.org/fhir/StructureDefinition/package-source"
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
      "valueCode": "fhir"
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
      "valueInteger": 0,
      "_valueInteger": {
        "extension": [
          {
            "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
            "valueCanonical": "http://hl7.org/fhir/4.0/ImplementationGuide/hl7.fhir.uv.xver-r4.r4b"
          }
        ]
      }
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
      "valueCode": "trial-use",
      "_valueCode": {
        "extension": [
          {
            "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-conformance-derivedFrom",
            "valueCanonical": "http://hl7.org/fhir/4.0/ImplementationGuide/hl7.fhir.uv.xver-r4.r4b"
          }
        ]
      }
    }
  ],
  "url": "http://terminology.hl7.org/CodeSystem/reaction-event-certainty",
  "version": "4.0.1",
  "name": "AllergyIntoleranceCertainty",
  "title": "AllergyIntoleranceCertainty",
  "status": "draft",
  "experimental": false,
  "date": "2019-11-01T08:29:23+10:00",
  "publisher": "FHIR Infrastructure",
  "contact": [
    {
      "name": "FHIR Infrastructure",
      "telecom": [
        {
          "system": "url",
          "value": "http://www.hl7.org/Special/committees/fiwg"
        }
      ]
    }
  ],
  "description": "Statement about the degree of clinical certainty that a specific substance was the cause of the manifestation in a reaction event.",
  "jurisdiction": [
    {
      "coding": [
        {
          "system": "http://unstats.un.org/unsd/methods/m49/m49.htm",
          "code": "001",
          "display": "World"
        }
      ]
    }
  ],
  "caseSensitive": true,
  "valueSet": "http://hl7.org/fhir/ValueSet/reaction-event-certainty|5.2.0",
  "content": "complete",
  "concept": [
    {
      "code": "unlikely",
      "display": "Unlikely",
      "definition": "There is a low level of clinical certainty that the reaction was caused by the identified substance."
    },
    {
      "code": "likely",
      "display": "Likely",
      "definition": "There is a high level of clinical certainty that the reaction was caused by the identified substance."
    },
    {
      "code": "confirmed",
      "display": "Confirmed",
      "definition": "There is a very high level of clinical certainty that the reaction was due to the identified substance, which may include clinical evidence by testing or rechallenge."
    },
    {
      "code": "unknown",
      "display": "Unknown",
      "definition": "The clinical certainty that the reaction was caused by the identified substance is unknown.  It is an explicit assertion that certainty is not known."
    }
  ]
}