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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 > Central Nervous System Stimulants Causing Adverse Effects In Therapeutic Use E940.* > 2008 ICD-9-CM Diagnosis E940.1 Opiate antagonists 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 Therefore, this code may be out of date.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 E940.1 can be accessed here. E940.1 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 E940.* hierarchy E940.1 also known as: Levallorphan Nalorphine Naloxone