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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 066.40 West nile fever, unspecified  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 Therefore, this code may be out of date.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 066.40 can be accessed here. A mosquito-borne viral illness caused by the WEST NILE VIRUS, a FLAVIVIRUS and endemic to regions of Africa, Asia, and Europe. Common clinical features include HEADACHE, FEVER, maculopapular rash, gastrointestinal symptoms, and lymphadenopathy. MENINGITIS; ENCEPHALITIS; and MYELITIS may also occur. The disease may occasionally be fatal or leave survivors with residual neurologic deficits. (From Joynt, Clinical Neurology, 1996, Ch26, p13; Lancet 1998 Sep 5;352(9130):767-71) 066.40 is a specific code that can be used to specify a diagnosis 066.40 contains 3 index entries View the ICD-9-CM Volume 1 066.* hierarchy Index entries containing 066.40: Fever 780.6 West Nile (viral) 066.40 with cranial nerve disorders 066.42 encephalitis 066.41 optic neuritis 066.42 other complications 066.49 other neurologic manifestations 066.42 polyradiculitis 066.42 West Nile fever 066.40 with cranial nerve disorders 066.42 encephalitis 066.41 optic neuritis 066.42 other complications 066.49 other neurologic manifestations 066.42 polyradiculitis 066.42 virus 066.40