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2008 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 330-337 > Other Cerebral Degenerations 331.* > 2008 ICD-9-CM Diagnosis 331.8 Other cerebral degeneration 331.8 is a non-specific code that cannot be used to specify a diagnosis View the ICD-9-CM Volume 1 331.* hierarchy