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2007 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 > 2007 ICD-9-CM Diagnosis 321 Meningitis due to other organisms  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 321 can be accessed here. 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