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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Injury And Poisoning 800-999 > Poisoning By Drugs, Medicinals And Biological Substances 960-979 > Poisoning By Anticonvulsants And Anti-Parkinsonism Drugs 966.* > 2008 ICD-9-CM Diagnosis 966.1 Poisoning by hydantoin derivatives 966.1 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 966.* hierarchy 966.1 also known as: Phenytoin