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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 > Bacterial Meningitis 320.* > 2007 ICD-9-CM Diagnosis 320.81 Anaerobic meningitis  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 Therefore, this code may be out of date.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 320.81 can be accessed here. 320.81 is a specific code that can be used to specify a diagnosis 320.81 contains 13 index entries View the ICD-9-CM Volume 1 320.* hierarchy 320.81 also known as: Gram-negative anaerobes Bacteroides (fragilis) Index entries containing 320.81: Meningitis (basal) (basic) (basilar) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetica) (toxic) 322.9 anaerobes (cocci) (gram-negative) (gram-positive) (mixed) (NEC) 320.81 bacterial NEC 320.9 anaerobic 320.81 gram-negative 320.82 anaerobic 320.81 Bacteroides (fragilis) (oralis) (melaninogenicus) 320.81 Clostridium (haemolyticum) (novyi) NEC 320.81 Eubacterium 320.81 Fusobacterium 320.81 gram-negative bacteria NEC 320.82 anaerobic 320.81 Peptococcus 320.81 PeptoStreptococcus 320.81 Proprionibacterium 320.81 Treponema (denticola) (macrodenticum) 320.81 Veillonella 320.81