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2009 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 > 2009 ICD-9-CM Diagnosis 323 Encephalitis myelitis and encephalomyelitis 323 is a non-specific code that cannot be used to specify a diagnosis 323 includes: acute disseminated encephalomyelitis meningoencephalitis, except bacterial meningomyelitis, except bacterial myelitis: ascending transverse 323 excludes: acute transverse myelitis NOS (341.20) acute transverse myelitis in conditions classified elsewhere (341.21) bacterial: meningoencephalitis (320.0-320.9) meningomyelitis (320.0-320.9) idiopathic transverse myelitis (341.22)