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2007 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.* > 2007 ICD-9-CM Diagnosis 966.4 Poisoning by anti-parkinsonism drugs  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 Therefore, this code may be out of date.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 966.4 can be accessed here. 966.4 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 966.* hierarchy 966.4 also known as: Amantadine Ethopropazine [profenamine] Levodopa [L-dopa]