{
  "package" : "hl7.fhir.uv.extensions@5.2.0",
  "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.",
  "system" : "http://hl7.org/fhir/reaction-event-certainty",
  "property" : [ ],
  "codesystem" : "b254f4b0-223d-5908-a89e-04f5a0f3a0b9",
  "concept_id" : "adfb9215-a80e-5a21-adc9-b6152ed541ca",
  "ancestors" : {
    "unknown" : 0
  },
  "id" : "d37664ab-c3e9-4a5b-bf8b-b066a6422d93",
  "code" : "unknown",
  "display" : "Unknown",
  "version" : "5.2.0"
}