2006 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 320-327 > 2006 ICD-9-CM Diagnosis 320 Bacterial meningitis View the most recent version of ICD-9-CM 320 Bacterial infections of the leptomeninges and subarachnoid space, frequently involving the cerebral cortex, cranial nerves, cerebral blood vessels, spinal cord, and nerve roots. The type of causative organism varies with age and clinical status (e.g., post-operative, immunodeficient, or post-traumatic states). Clinical manifestations include the acute onset of fever, stiff neck, altered mentation, seizures, and focal neurologic deficits. Death may occur within 24 hours of disease onset. Pathologic features include a purulent exudate in the subarachnoid space, and diffuse inflammation of neural and vascular structures. 320 is a non-specific code that cannot be used to specify a diagnosis 320 Includes arachnoiditis bacterial leptomeningitis bacterial meningitis bacterial meningoencephalitis bacterial meningomyelitis bacterial pachymeningitis bacterial