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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 331.2 Senile degeneration of brain  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 Therefore, this code may be out of date.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 331.2 can be accessed here. 331.2 is a specific code that can be used to specify a diagnosis 331.2 contains 6 index entries View the ICD-9-CM Volume 1 331.* hierarchy 331.2 excludes: senility NOS (797) Index entries containing 331.2: Atrophy, atrophic brain (cortex) (progressive) 331.9 senile 331.2 Degeneration, degenerative brain (cortical) (progressive) 331.9 senile 331.2 motor centers, senile 331.2 senile 797 brain 331.2 motor centers 331.2 Disease, diseased - see also Syndrome brain 348.9 senile 331.2