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2007 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 > 2007 ICD-9-CM Diagnosis E851 Accidental poisoning by barbiturates  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 Therefore, this code may be out of date.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 E851 can be accessed here. E851 is a specific code that can be used to specify a diagnosis E851 also known as: Amobarbital [amylobarbitone] Barbital [barbitone] Butabarbital [butabarbitone] Pentobarbital [pentobarbitone] Phenobarbital [phenobarbitone] Secobarbital [quinalbarbitone] E851 excludes: thiobarbiturates (E855.1)