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 331.83 Mild cognitive impairment, so stated  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 Therefore, this code may be out of date.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 331.83 can be accessed here. 331.83 is a specific code that can be used to specify a diagnosis 331.83 contains 2 index entries View the ICD-9-CM Volume 1 331.* hierarchy ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog. 331.83 excludes: altered mental status (780.97) cerebral degeneration (331.0-331.9) change in mental status (780.97) cognitive deficits following (late effects of) cerebral hemorrhage or infarction (438.0) cognitive impairment due to intracranial or head injury (850-854, 959.01) cognitive impairment due to late effect of intracranial injury (907.0) dementia (290.0-290.43, 294.8) mild memory disturbance (310.8) neurologic neglect syndrome (781.8) personality change, nonpsychotic (310.1) Index entries containing 331.83: Impaired, impairment (function) cognitive, mild, so stated 331.83 mild cognitive, so stated 331.83