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== ICD-9 ==

'''ICD-9''' ('''International Classification of Diseases, Ninth Revision'''), pronounced as /aɪ siː diː naɪn/, is a system of medical classification used by healthcare professionals worldwide to code and classify diseases, symptoms, abnormal findings, complaints, and external causes of injury and diseases. The ICD-9 was developed by the [[World Health Organization]] (WHO) and was in use until it was superseded by the [[ICD-10]] in 1994.

=== Etymology ===

The term '''ICD-9''' is an abbreviation of '''International Classification of Diseases, Ninth Revision'''. The term reflects the purpose of the system (to classify diseases internationally) and its version number (9).

=== Related Terms ===

* [[ICD-10]]: The tenth revision of the International Classification of Diseases, which replaced ICD-9.
* [[ICD-11]]: The eleventh and current revision of the International Classification of Diseases.
* [[World Health Organization]]: The international body responsible for the creation and maintenance of the ICD system.
* [[Medical classification]]: A system of categories to which medical diagnoses or other health-related entities are assigned based on common characteristics.
* [[Disease]]: A particular abnormal condition that negatively affects the structure or function of all or part of an organism, and that is not due to any immediate external injury.
* [[Symptom]]: A physical or mental feature which is regarded as indicating a condition of disease, particularly such a feature that is apparent to the patient.

[[Category:Medical terminology]]
[[Category:Healthcare quality]]
[[Category:Medical classification]]

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