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(International Classification of Diseases and Related Health Problems) A classification of diagnostic codes in the medical field published by the World Health Organization (WHO). Stemming from the French Bertillon classification in the late 1800s, the WHO took over ICD in 1946. The three-volume ICD-9 CM (ICD-Version 9 Clinical Modifications) was introduced in 1979 and is also the HIPAA transaction code set.

Physicians use Volumes 1 and 2 of ICD-9 CM for diagnostic codes and Current Procedural Terminology (CPT) codes for their procedures. Volume 3 of ICD-9 CM is used by hospitals for procedure codes.

ICD-10, ICD-10 CM and ICD-10 PCS
ICD-Version 10 has been used for morbidity and mortality statistics worldwide since 1994 and in the U.S. since 1999. ICD-10 CM, introduced in 2002, replaces ICD-9 CM with a final adoption deadline of October 1, 2013, mandated by Health and Human Services (HHS).

ICD-10 CM includes 68,000 diagnostic codes, five times more than ICD-9 CM. It expanded the code from five to seven characters, allowing alpha, except for U, in position four through seven (from ANN.NN to ANN.AAA A).

ICD-10 (PCS) Procedural Coding System replaces Volume 3 of ICD-9 CM for hospital procedure codes. See SNOMED CT, LOINC and healthcare IT.
References in periodicals archive ?
The Workgroup for Electronic Data Interchange (WEDI) recently held a forum to discuss topics related to implementation of the ICD-10 CM and ICD-10 PCS medical-code sets.
The service will enable use of clinical and administrative code sets including ICD-9 CM and ICD-10 CM, SNOMED CT, RxNorm LOINC, HCPCS and others , "Obut the focus is on the business and financial impacts of coding changes.
However, healthcare organizations must undertake an enterprisewide approach, since the change to ICD-10 CM will affect clinical, administrative, IT and many other departments.
This mapping capability delivers the foundation for future migration from ICD-9 CM to ICD-10 CM.