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To classify means to arrange different entities in classes, groups, or categories, according to similar characteristics, based on defined criteria. Classification usually involves the categorization of relevant natural language for the purposes of systematic analysis within a single field of concepts. In the case of diseases and health problems, there are many possible axes along which to organize a classification, including anatomy, etiology, and pathology, and the axis used will depend on the intended use of the compiled data.

The International Statistical Classification of Diseases and Related Health Problems (the complete name oftheClassificationalsoknownbytheacronymof ICD) is a global standard and international public tool for organizing and classifying information about diseases and other related health problems. It is a detailed list of known diseases, injuries, external causes of injuries, signs, symptoms, factors influencing health status, and contact with health services. The ICD is an epidemiological and statistical instrument developed to facilitate the understanding of health information on diseases and health-related problems and to help identify and monitor health situations and define health policies, priorities, resources, and programs.

TheICD is published by the World Health Organization (WHO) and is revised periodically. The currently used edition is the Tenth Revision (ICD-10), approved in 1990 by the World Health Assembly and published for the first time in 1992. The WHO assumed leadership and coordination of the preparation and publication of the successive revisions of the ICD, beginning with the ICD-6 in 1950.

History

The Hindu text known as Sushruta Samhita (600 AD) is possibly the earliest effort to classify diseases and injuries. The first statistical study of diseases and causes of death published in the world is considered to be the ‘Natural and Political Observation Made Upon the Bills of Mortality’ of John Graunt, published in London in 1662. Graunt prepared a list of 83 causes of death, mixing etiology, pathology, circumstances, and other criteria, and recorded the number of citizens who died of each. However, the first internationally recognized attempt to systematically classify diseases is generally considered to be the Nosologia Methodica of Franc¸ois Bossier de Lacroix, better known as Sauvages (1706–1777). More then one century later, in 1891, the International Statistical Institute created a committee, chaired by the Chief of the Statistical Services of the City of Paris, Jacques Bertillon, to prepare a classification of causes of death, which was presented and approved at the 1893 meeting. The basic structure was based on that proposed by William Farr (1808–1883) in the beginning of the international discussions on classification structure. The scheme was, for all purposes, epidemiological or statistical, to organize diseases and conditions as follows:

  • Epidemic diseases
  • Constitutional or general diseases
  • Local diseases arranged by site
  • Developmental diseases
  • Injuries

This general structure, which can still be identified in ICD-10, was reviewed in every new revision but is maintained because it is still considered more useful than any other tested.

The Bertillon Classification of Causes of Death, as this classification was first called, was adopted by several countries, and in 1898 the American Public Health Association recommended its adoption by Canada, Mexico, and the United States. It was also suggested by the Association that the classification should be revised every 10 years. Following that suggestion, the French Government convoked, in 1900, the First International Conference for the Revision of the International List of Causes of Death (Bertillon's classification). In August 1900, the First Revision was adopted.

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