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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Infectious And Parasitic Diseases 001-139 > Arthropod-Borne Viral Diseases 060-066 > Other Arthropod-Borne Viral Diseases 066.* > 2008 ICD-9-CM Diagnosis 066.41 West nile fever with encephalitis  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 Therefore, this code may be out of date.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 066.41 can be accessed here. 066.41 is a specific code that can be used to specify a diagnosis 066.41 contains 6 index entries View the ICD-9-CM Volume 1 066.* hierarchy 066.41 also known as: West Nile encephalitis West Nile encephalomyelitis Index entries containing 066.41: Encephalitis (bacterial) (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) 323.9 West Nile type 066.41 Encephalomyelitis (chronic) (granulomatous) (hemorrhagic necrotizing, acute) (myalgic, benign) (see also Encephalitis) 323.9 West Nile 066.41 Fever 780.6 West Nile (viral) 066.40 with encephalitis 066.41 West Nile encephalitis 066.41 encephalomyelitis 066.41 fever 066.40 with encephalitis 066.41