{
  "package" : "hl7.fhir.r4.examples@4.0.1",
  "definition" : null,
  "system" : "http://terminology.hl7.org/CodeSystem/v2-0396",
  "property" : [ {
    "_uri" : "http://hl7.org/fhir/concept-properties#status",
    "code" : "status",
    "valueCode" : "deprecated"
  }, {
    "_uri" : "http://hl7.org/fhir/concept-properties#deprecationDate",
    "code" : "deprecationDate",
    "valueDateTime" : "2011-01"
  } ],
  "codesystem" : "e9cf8668-decc-5804-af00-7e9ad1ae2565",
  "concept_id" : "a18b0878-4d0d-54ac-8ecd-2ed0c2f93022",
  "ancestors" : {
    "ICDO2" : 0
  },
  "extension" : [ {
    "url" : "http://hl7.org/fhir/StructureDefinition/codesystem-concept-comments",
    "valueString" : "Percy C, VanHolten V, and Muir C, editors. International Classification of Diseases for Oncology. Second Edition. Geneva: World Health Organization; 1990.\r\n\r\nThe ICD-9 neoplasm structure did not include morphology and there was a growing interest by physicians to establish a coding system for morphology.  ICD-O is used in cancer registries (and other related areas) for coding the topography (site) and morphology of a neoplasm. The topography code uses similar categories as ICD-10 for malignant neoplasms allowing greater specificity for the site of non-malignant neoplasms than in ICD-10.  The topography code consists of an alphabetic character (the letter C) followed by two numeric digits, a decimal point, and a numeric digit. The morphology code consists of a 6-digit numeric code which consists of three parts: histologic type (4-digit), behavior code (1-digit), and grading or differentiation (1-digit). ICD-O-2 is used for tumors diagnosed prior to 2001."
  } ],
  "id" : "bc0b4c08-2ee1-40dd-bc59-5cc914102ec1",
  "code" : "ICDO2",
  "display" : "International Classification of Disease for Oncology Second Edition",
  "version" : "2.9"
}