2006 ICD-9-CM Volume 1 Diagnosis Codes > Diseases Of The Nervous System And Sense Organs 320-389 > Inflammatory Diseases Of The Central Nervous System 320-327 > 320 Bacterial meningitis 321 Meningitis due to other organisms 322 Meningitis of unspecified cause 323 Encephalitis myelitis and encephalomyelitis 324 Intracranial and intraspinal abscess 325 Phlebitis and thrombophlebitis of intracranial venous sinuses 326 Late effects of intracranial abscess or pyogenic infection 327 Sleep disorders