ICD-10-CM > G00-G99 > G00-G09 > G03 G03 Meningitis due to other and unspecified causes Non-Billable/Non-Specific Includes arachnoiditis NOSleptomeningitis NOSmeningitis NOSpachymeningitis NOS Type 1 Excludes meningoencephalitis (G04.-)meningomyelitis (G04.-) Codes G03.0Nonpyogenic meningitisG03.1Chronic meningitisG03.2Benign recurrent meningitis [Mollaret]G03.8Meningitis due to other specified causesG03.9Meningitis, unspecified