{

"resourceType": "CodeSystem",
"id": "reaction-event-certainty",
"meta": {
  "lastUpdated": "2019-11-01T09:29:23.356+11:00"
},
"url": "http://terminology.hl7.org/CodeSystem/reaction-event-certainty",
"identifier": [
  {
    "system": "urn:ietf:rfc:3986",
    "value": "urn:oid:2.16.840.1.113883.4.642.4.1276"
  }
],
"version": "4.0.1",
"name": "AllergyIntoleranceCertainty",
"title": "AllergyIntoleranceCertainty",
"status": "draft",
"experimental": false,
"date": "2019-11-01T09:29:23+11:00",
"publisher": "HL7 (FHIR Project)",
"contact": [
  {
    "telecom": [
      {
        "system": "url",
        "value": "http://hl7.org/fhir"
      },
      {
        "system": "email",
        "value": "fhir@lists.hl7.org"
      }
    ]
  }
],
"description": "Statement about the degree of clinical certainty that a specific substance was the cause of the manifestation in a reaction event.",
"caseSensitive": true,
"valueSet": "http://hl7.org/fhir/ValueSet/reaction-event-certainty",
"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."
  }
]

}