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ICD-9-CM Codes by Volume

ICD-9-CM codes are divided into volumes 1-3 by code type: either diagnosis codes, or procedure codes.

ICD-9-CM Diagnosis Codes

The International Classification of Diseases, Clinical Modification (ICD-9-CM), is used in assigning codes to diagnoses associated with inpatient, outpatient, and physician office utilization in the U.S. The ICD-9-CM is based on the ICD but provides for additional morbidity detail and is annually updated.

Volumes 1 and Volumes 2

ICD-9-CM Volume 1 is a tabular listing containing a numerical list of the disease code numbers.

ICD-9-CM Volume 2 is an alphabetical index to the disease entries.

Note: ICD-10-CM is the new diagnosis coding system that is being developed as a replacement for ICD-9-CM, Volumes 1 & 2.

ICD-9-CM Procedure Codes

The third volume of ICD-9-CM is a classification system for surgical, diagnostic, and therapeutic procedures in hospitals and inpatient settings.

Volume 3

ICD-9-CM Volume 3 is an alphabetic index and tabular list.

Note: ICD-10-PCS is the new procedure coding system that is being developed as a replacement for ICD-9-CM, Volume 3.