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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Supplementary Classification Of External Causes Of Injury And Poisoning E800-E999 > Drugs, Medicinal And Biological Substances Causing Adverse Effects In Therapeutic Use E930-E949 > Other Central Nervous System Depressants And Anesthetics Causing Adverse Effects In Therapeutic Use E938.* > 2008 ICD-9-CM Diagnosis E938.0 Central nervous system muscle-tone depressants causing adverse effects in therapeutic use  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM E938.0 can be accessed here. E938.0 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 E938.* hierarchy E938.0 also known as: Chlorphenesin (carbamate) Mephenesin Methocarbamol