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 > ICD-9-CM Diagnosis 322 Meningitis of unspecified cause Inflammation of the coverings of the brain and/or spinal cord, which consist of the PIA MATER; ARACHNOID; and DURA MATER. Infections (viral, bacterial, and fungal) are the most common causes of this condition, but subarachnoid hemorrhage (HEMORRHAGES, SUBARACHNOID), chemical irritation (chemical MENINGITIS), granulomatous conditions, neoplastic conditions (e.g., carcinomatous meningitis), and other inflammatory conditions may produce this syndrome. 322 is a non-specific code that cannot be used to specify a diagnosis ICD-9-CM Diagnosis 322.0 Nonpyogenic meningitis 322.0 is a specific code that can be used to specify a diagnosis 322.0 contains 4 index entries ICD-9-CM Diagnosis 322.1 Eosinophilic meningitis 322.1 is a specific code that can be used to specify a diagnosis 322.1 contains 1 index entry ICD-9-CM Diagnosis 322.2 Chronic meningitis 322.2 is a specific code that can be used to specify a diagnosis 322.2 contains 1 index entry ICD-9-CM Diagnosis 322.9 Meningitis unspecified Inflammation of the coverings of the brain and/or spinal cord, which consist of the PIA MATER; ARACHNOID; and DURA MATER. Infections (viral, bacterial, and fungal) are the most common causes of this condition, but subarachnoid hemorrhage (HEMORRHAGES, SUBARACHNOID), chemical irritation (chemical MENINGITIS), granulomatous conditions, neoplastic conditions (e.g., carcinomatous meningitis), and other inflammatory conditions may produce this syndrome. 322.9 is a specific code that can be used to specify a diagnosis 322.9 contains 13 index entries