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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Supplementary Classification Of External Causes Of Injury And Poisoning E800-E999 > Accidental Poisoning By Drugs, Medicinal Substances, And Biologicals E850-E858 > Accidental Poisoning By Tranquilizers E853.* > 2008 ICD-9-CM Diagnosis E853.0 Accidental poisoning by phenothiazine-based tranquilizers  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 Therefore, this code may be out of date.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 E853.0 can be accessed here. E853.0 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 E853.* hierarchy E853.0 also known as: Chlorpromazine Fluphenazine Prochlorperazine Promazine