2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Injury And Poisoning 800-999 > Poisoning By Drugs, Medicinals And Biological Substances 960-979 > Poisoning By Primarily Systemic Agents 963.* > 2006 ICD-9-CM Diagnosis 963.4 Poisoning by enzymes not elsewhere classified View the most recent version of ICD-9-CM 963.4 963.4 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 963.* hierarchy Alternate Terminology Penicillinase