According to the Centers for Disease Control and Prevention, ICD-9-CM stands for International Classification of Diseases, Ninth Revision, Clinical Modification. This system assigns official codes to hospital diagnoses and procedures in the United States.
The Centers for Disease Control and Prevention indicates that the ICD-9-CM includes an alphabetical index of diseases, a numerical list of codes representing diseases and a system to classify diagnostic, surgical and therapeutic procedures. The system is based on the World Health Organization's International Classification of Diseases, Ninth Revision. The National Center for Health Statistics and The Centers for Medicare and Medicaid Services oversee changes and revisions to the ICD-9-CM.