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Unified Medical Language System (UMLS)

UMLS Vocabularies

ICD9CM (International Classification of Diseases, Ninth Revision, Clinical Modification) - Synopsis

Search ICD9CM in the UMLS Metathesaurus
(requires a free UMLS license)

Web site:
http://www.cdc.gov/nchs/icd/icd9cm.htm

Authority
The International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) is based on the World Health Organization's Ninth Revision, International Classification of Diseases (ICD-9). ICD-9-CM was maintained by the National Center for Health Statistics (NCHS) and the Centers for Medicare and Medicaid Services (CMS).

Purpose
ICD-9-CM was developed to code and classify morbidity data from the inpatient and outpatient records, physician offices, and most National Center for Health Statistics (NCHS) surveys.

As of October 1, 2015, Department of Health and Human Services (HHS) mandated that all entities covered by the Health Insurance Portability and Accountability Act (HIPAA) must transition to a new set of codes for electronic health care transactions in the form of International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) and International Classification of Diseases, Tenth Revision, Procedure Coding System (ICD-10-PCS).

For more information about ICD-10-CM and ICD-10-PCS in the Metathesaurus, please see the ICD10CM source synopsis or the ICD10PCS source synopsis.

Description
The ICD-9-CM consists of:

  • a tabular list containing a numerical list of the disease code numbers;
  • an alphabetical index to the disease entries; and
  • a classification system for surgical, diagnostic, and therapeutic procedures (alphabetic index and tabular list).

Metathesaurus Scope
The Metathesaurus representation of ICD-9-CM includes codes from the tabular lists for diseases, procedures, and supplementary classifications (typically referred to as Volumes 1 and 3). The Metathesaurus does not include terminology extracted from the indexes. In addition to preferred names, the Metathesaurus provides "entry terms" extracted from the tabular lists. These synonyms, or closely related names, are reviewed and edited by UMLS editors and are assigned to the Metathesaurus Additional Entry Terms for ICD-9-CM source.

Audience
ICD-9-CM is used in a variety of clinical and health care applications for reporting, morbidity statistics, and billing.

Metathesaurus Update Frequency
ICD-9-CM is no longer updated in the Metathesaurus. The last update was the 2015AA release.

Sites Consulted

  1. Classifications of Diseases, Functioning, and Disability [Internet]. Hyattsville (MD): National Center for Health Statistics; [updated 2010 Jan 04; reviewed 2009 Sep 1; cited 2010 Nov 23]. Available from: http://www.cdc.gov/nchs/icd.htm
  2. Classifications of Diseases, Functioning, and Disability [Internet]. Hyattsville (MD): National Center for Health Statistics; [updated 2010 Jan 04; reviewed 2009 Sep 1]. International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM); [updated 2010 Sep 21; reviewed 2010 Sep 21; cited 2010 Nov 23]. Available from: http://www.cdc.gov/nchs/icd/icd9cm.htm