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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 323.1 Encephalitis in rickettsial 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 Therefore, this code may be out of date.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 323.1 can be accessed here. 323.1 is a specific code that can be used to specify a diagnosis 323.1 contains 2 index entries View the ICD-9-CM Volume 1 323.* hierarchy Code first underlying disease (080-083.9) Index entries containing 323.1: Encephalitis (bacterial) (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) 323.9 due to rickettsiosis (see also Rickettsiosis) 083.9 [323.1] typhus (fever) (see also Typhus) 081.9 [323.1]