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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Nervous System And Sense Organs 320-389 > Hereditary And Degenerative Diseases Of The Central Nervous System 330-338 > Other Cerebral Degenerations 331.* > 2007 ICD-9-CM Diagnosis 331.89 Other cerebral degeneration  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 Therefore, this code may be out of date.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 331.89 can be accessed here. 331.89 is a specific code that can be used to specify a diagnosis 331.89 contains 8 index entries View the ICD-9-CM Volume 1 331.* hierarchy 331.89 also known as: Cerebral ataxia Index entries containing 331.89: Ataxia, ataxy, ataxic 781.3 brain 331.89 cerebral 331.89 Degeneration, degenerative brain (cortical) (progressive) 331.9 familial NEC 331.89 heredofamilial NEC 331.89 motor centers 331.89 specified type NEC 331.89 heredofamilial brain NEC 331.89 Disease, diseased - see also Syndrome heredodegenerative NEC brain 331.89