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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Nervous System And Sense Organs 320-389 > Inflammatory Diseases Of The Central Nervous System 320-326 > Encephalitis Myelitis And Encephalomyelitis 323.* > 2008 ICD-9-CM Diagnosis 323.0 Encephalitis in viral diseases classified elsewhere  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 Therefore, this code may be out of date.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 323.0 can be accessed here. 323.0 is a non-specific code that cannot be used to specify a diagnosis View the ICD-9-CM Volume 1 323.* hierarchy Code first underlying disease, as: cat-scratch disease (078.3) infectious mononucleosis (075) ornithosis (073.7)