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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 323.01 Encephalitis and encephalomyelitis 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 Therefore, this code may be out of date.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 323.01 can be accessed here. 323.01 is a specific code that can be used to specify a diagnosis 323.01 contains 6 index entries View the ICD-9-CM Volume 1 323.* hierarchy 323.01 excludes: encephalitis (in): arthropod-borne viral (062.0-064) herpes simplex (054.3) mumps (072.2) other viral diseases of central nervous system (049.8-049.9) poliomyelitis (045.0-045.9) rubella (056.01) slow virus infections of central nervous system (046.0-046.9) viral NOS (049.9) West Nile (066.41) Index entries containing 323.01: Encephalitis (bacterial) (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) 323.9 due to cat-scratch disease 078.3 [323.01] infectious mononucleosis 075 [323.01] ornithosis 073.7 [323.01] Encephalomyelitis (chronic) (granulomatous) (hemorrhagic necrotizing, acute) (myalgic, benign) (see also Encephalitis) 323.9 due to cat-scratch disease 078.3 [323.01] infectious mononucleosis 075 [323.01] ornithosis 073.7 [323.01]