<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (April 2014) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (April 2014) (Learn how and when to remove this template message) </Td> </Tr> <P> ICD - 10 is the 10th revision of the International Statistical Classification of Diseases and Related Health Problems (ICD), a medical classification list by the World Health Organization (WHO). It contains codes for diseases, signs and symptoms, abnormal findings, complaints, social circumstances, and external causes of injury or diseases . Work on ICD - 10 began in 1983, in 1990 it was endorsed by the Forty - third World Health Assembly, and was first used by member states in 1994 . </P> <P> The code set in the base classification allows for more than 14,000 different codes, and permits the tracking of many new diagnoses compared to ICD - 9 . Through the use of optional sub-classifications the number of codes can be expanded to over 16,000 . Some national editions expand the code set even further; ICD - 10 - CM, for example, has over 70,000 codes . </P>

When did we start using icd 10 codes