ICD-9 is the International Classification of Diseases, Ninth Revision. It is the official classification system used to assign codes to health conditions and is designed to promote international comparability in the collection, processing, classification and presentation of mortality statistics, according to the Centers for Disease Control and Prevention.
ICD is used in the health and medical industries by physicians, nurses, health information managers, health information technology professionals and policy makers to numerically classify diseases and other health issues documented on a variety of medical and vital records, explains the World Health Organization. ICD undergoes regular revision, and as of 2014, ICD-10 is used. A revised version, ICD-11, is scheduled for release in 2017.