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 321 Meningitis due to other organisms View the most recent version of ICD-9-CM 321 321 is a non-specific code that cannot be used to specify a diagnosis 321 Includes arachnoiditis due to organisms other than bacteria leptomeningitis due to organisms other than bacteria meningitis due to organisms other than bacteria pachymeningitis due to organisms other than bacteria