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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Supplementary Classification Of External Causes Of Injury And Poisoning E800-E999 > Drugs, Medicinal And Biological Substances Causing Adverse Effects In Therapeutic Use E930-E949 > Other Anti-Infectives Causing Adverse Effects In Therapeutic Use E931.* > 2007 ICD-9-CM Diagnosis E931.4 Antimalarials and drugs acting on other blood protozoa causing adverse effects in therapeutic use  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 Therefore, this code may be out of date.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 E931.4 can be accessed here. E931.4 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 E931.* hierarchy E931.4 also known as: Chloroquine phosphate Cycloguanil Primaquine Proguanil [chloroguanide] Pyrimethamine Quinine (sulphate)