International Classification of Diseases (ICD)

Used to code and classify cause-of-death data. ICD is developed collaboratively by the World Health Organization and 10 international centers, one of which is housed at the National Center for Health Statistics (NCHS). ICD promotes international comparability in the collection, classification, processing, and presentation of health statistics. Since 1900, ICD has been modified about once every 10 years, except for the 20-year interval between the 9th and 10th revisions (ICD–9 and ICD–10) (ICD-Table). The purpose of the revisions is to stay up-to-date with advances in medical science. New revisions usually introduce major disruptions in the time series of mortality statistics (see Sources and Definitions, Cause of death). For more information, see the NCHS ICD–10 website. (Also see Sources and Definitions, Cause of death; Comparability ratio; International Classification of Diseases, Clinical Modification [ICD–CM].)

ICD-Table. Revision of International Classification of Diseases (ICD), by year of conference in which adopted and years in use in United States

SOURCE: National Center for Health Statistics. Available from: https://www.cdc.gov/nchs/icd/icd9.htm.