{

"resourceType": "CodeSystem",
"id": "ex-onsettype",
"meta": {
  "lastUpdated": "2019-11-01T09:29:23.356+11:00",
  "profile": [
    "http://hl7.org/fhir/StructureDefinition/shareablecodesystem"
  ]
},
"url": "http://hl7.org/fhir/ex-onsettype",
"identifier": [
  {
    "system": "urn:ietf:rfc:3986",
    "value": "urn:oid:2.16.840.1.113883.4.642.4.579"
  }
],
"version": "4.0.1",
"name": "ExampleOnsetType(Reason)Codes",
"title": "Example Onset Type (Reason) Codes",
"status": "draft",
"experimental": false,
"publisher": "Financial Management",
"contact": [
  {
    "telecom": [
      {
        "system": "url",
        "value": "http://hl7.org/fhir"
      }
    ]
  }
],
"description": "This value set includes example Onset Type codes which are used to identify the event for which the onset, starting date, is required.",
"copyright": "This is an example set.",
"caseSensitive": true,
"valueSet": "http://hl7.org/fhir/ValueSet/ex-onsettype",
"content": "complete",
"concept": [
  {
    "code": "lxm",
    "display": "Last Exam",
    "definition": "Date of last examination."
  },
  {
    "code": "sym",
    "display": "Start of Symptoms",
    "definition": "Date when symptoms were first noticed."
  },
  {
    "code": "lmn",
    "display": "Last Menstruation",
    "definition": "Start date of last menstruation."
  }
]

}