Final answer:
The Centers for Disease Control and Prevention (CDC) is responsible for updating the procedure classification of ICD-9-CM.
Step-by-step explanation:
The organization responsible for updating the procedure classification of ICD-9-CM is the Centers for Disease Control and Prevention (CDC). The CDC is a federal agency under the United States Department of Health and Human Services. They regularly review and update the International Classification of Diseases, Clinical Modification (ICD-CM) codes to ensure accurate representation of medical procedures and diagnoses.