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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 331.0 Alzheimer's disease  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 Therefore, this code may be out of date.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 331.0 can be accessed here. A degenerative disease of the BRAIN characterized by the insidious onset of DEMENTIA. Impairment of MEMORY, judgment, attention span, and problem solving skills are followed by severe APRAXIAS and a global loss of cognitive abilities. The condition primarily occurs after age 60, and is marked pathologically by severe cortical atrophy and the triad of SENILE PLAQUES; NEUROFIBRILLARY TANGLES; and NEUROPIL THREADS. (From Adams et al., Principles of Neurology, 6th ed, pp1049-57) A disabling degenerative disease of the nervous system occurring in middle-aged or older persons and characterized by dementia and failure of memory for recent events, followed by total incapacitation and death. Types of the Alzheimer syndrome are differentiated by the age of onset and genetic characteristics. The early onset form (the mean age of the onset of symptoms between the ages of 40 and 60 years) and the late onset form (the onset of symptoms after the age of 60 years). Three forms are identified: AD-1, AD-2, AD-3. Some of the clinical characteristics of the Alzheimer syndrome are similar to those of the Pick syndrome. A progressive, neurodegenerative disease characterized by loss of function and death of nerve cells in several areas of the brain leading to loss of cognitive function such as memory and language. 331.0 is a specific code that can be used to specify a diagnosis 331.0 contains 8 index entries View the ICD-9-CM Volume 1 331.* hierarchy Index entries containing 331.0: Alzheimer's disease or sclerosis 331.0 with dementia - see Alzheimer's, dementia Atrophy, atrophic brain (cortex) (progressive) 331.9 Alzheimer's 331.0 with dementia - see Alzheimer's, dementia sclerosis, lobar (of brain) 331.0 with dementia with behavioral disturbance 331.0 [294.11] without behavioral disturbance 331.0 [294.10] Disease, diseased - see also Syndrome brain 348.9 Alzheimer's 331.0 with dementia - see Alzheimer's, dementia Sclerosis, sclerotic Alzheimer's 331.0 with dementia - see Alzheimer's, dementia brain (general) (lobular) 341.9 atrophic lobar 331.0 with dementia with behavioral disturbance 331.0 [294.11] without behavioral disturbance 331.0 [294.10] lobar, atrophic (of brain) 331.0 with dementia with behavioral disturbance 331.0 [294.11] without behavioral disturbance 331.0 [294.10] Syndrome - see also Disease Alzheimer's 331.0 with dementia - see Alzheimer's, dementia