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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 > Encephalitis Myelitis And Encephalomyelitis 323.* > 2009 ICD-9-CM Diagnosis 323.7 Toxic encephalitis 323.7 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 cause, as: carbon tetrachloride (982.1) hydroxyquinoline derivatives (961.3) lead (984.0-984.9) mercury (985.0) thallium (985.8)