Specific code 2015 ICD-9-CM Diagnosis Code 331.0
Alzheimer's disease
  • 2015
  • Billable Thru Sept 30/2015
  • Non-Billable On/After Oct 1/2015

  • ICD-9-CM 331.0 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 331.0 should only be used for claims with a date of service on or before September 30, 2015. For claims with a date of service on or after October 1, 2015, use an equivalent ICD-10-CM code (or codes).
Convert to ICD-10-CM: 331.0 converts approximately to:
  • 2015/16 ICD-10-CM G30.9 Alzheimer's disease, unspecified
Approximate Synonyms
  • Alzheimers dementia
  • Alzheimers dementia w behavioral disturbance
  • Alzheimers dementia w behavioral disturbance w delirium
  • Alzheimers dementia w behavioral disturbance w delusions
  • Alzheimers dementia w behavioral disturbance w depressed mood
  • Alzheimers dementia w delirium
  • Alzheimers dementia w delusions
  • Alzheimers dementia w depressed mood
  • Alzheimers dementia with behavioral disturbance
  • Alzheimers dementia with delirium
  • Alzheimers dementia with delusions
  • Alzheimers dementia with depressed mood
  • Alzheimers dementia with depressive mood
  • Alzheimers dementia wo behavior changes
  • Alzheimers dementia, early onset, uncomplicated
  • Alzheimers dementia, early onset, w behavioral disturbance
  • Alzheimers dementia, early onset, w delirium
  • Alzheimers dementia, early onset, w delusions
  • Alzheimers dementia, early onset, w depressed mood
  • Alzheimers dementia, early onset, with depressed mood
  • Alzheimers dementia, late onset, uncomplicated
  • Alzheimers dementia, late onset, w delirium
  • Alzheimers dementia, late onset, w delusions
  • Alzheimers dementia, late onset, w depressed mood
  • Alzheimers dementia, late onset, with delusions
  • Alzheimers dementia. with delirium
  • Alzheimers disease
  • Alzheimer's disease with altered behavior
  • Alzheimer's disease with behavioral disturbance
  • Alzheimer's disease with behavioral disturbance and delerium
  • Alzheimer's disease with behavioral disturbance and delusions
  • Alzheimer's disease with behavioral disturbance and depressed mood
  • Alzheimer's disease with delerium
  • Alzheimer's disease with delusions
  • Alzheimer's disease with depressed mood
  • Alzheimer's disease without altered behavior
  • Alzheimers disease, early onset
  • Alzheimers disease, late onset
  • Dementia Alzheimers type, late onset with delirium
  • Dementia due to Alzheimers disease
  • Dementia due to Alzheimer's disease
  • Dementia due to Alzheimers w behavior changes
  • Dementia due to Alzheimers with behavior changes
  • Dementia due to Alzheimers without behavior changes
  • Dementia of the Alzheimer type with behavioral disturbance
  • Dementia of the Alzheimers type with early onset
  • Dementia of the Alzheimers type, late onset
  • Dementia, Alzheimer type late onset W behavioral disturbance
  • Dementia, alzheimer type, primary degenerative
  • Dementia, primary degenerative, Alzheimer type
  • Early onset Alzheimer's disease with behavioral disturbance
  • Primary degenerative dementia of the Alzheimer type, presenile onset
  • Primary degenerative dementia of the Alzheimer type, presenile onset, uncomplicated
  • Primary degenerative dementia of the Alzheimer type, presenile onset, with delirium
  • Primary degenerative dementia of the Alzheimer type, presenile onset, with delusions
  • Primary degenerative dementia of the Alzheimer type, presenile onset, with depression
  • Primary degenerative dementia of the Alzheimer type, senile onset
  • Primary degenerative dementia of the Alzheimer type, senile onset, uncomplicated
  • Primary degenerative dementia of the Alzheimer type, senile onset, with delirium
  • Primary degenerative dementia of the Alzheimer type, senile onset, with delusions
  • Primary degenerative dementia of the Alzheimer type, senile onset, with depression
Clinical Information
  • 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
  • Neurodegenerative disorder of the cns resulting in progressive loss of memory and intellectual functions; begins in the middle or later years; characterized by brain lesions such as neurofibrillary tangles and neuritic plaques
ICD-9-CM Volume 2 Index entries containing back-references to 331.0:
  • Alzheimer's
    • disease or sclerosis 331.0
      • with dementia - see Alzheimer's, dementia
  • Atrophy, atrophic
    • brain (cortex) (progressive) 331.9
    • 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
      • arterial, artery 437.9
      • arteriosclerotic 437.0
      • congenital 742.9
      • degenerative - see Degeneration, brain
      • inflammatory - see also Encephalitis
        • late effect - see category 326
      • organic 348.9
      • parasitic NEC 123.9
      • Pick's 331.11
      • senile 331.2
  • Sclerosis, sclerotic
    • Alzheimer's 331.0
      • with dementia - see Alzheimer's, dementia
    • brain (general) (lobular) 348.89
      • Alzheimer's - see Alzheimer's, dementia
      • artery, arterial 437.0
      • atrophic lobar 331.0
        • with dementia
          • with behavioral disturbance 331.0 [294.11]
          • without behavioral disturbance 331.0 [294.10]
      • diffuse 341.1
        • familial (chronic) (infantile) 330.0
        • infantile (chronic) (familial) 330.0
        • Pelizaeus-Merzbacher type 330.0
      • disseminated 340
      • hereditary 334.2
      • hippocampal 348.81
      • infantile (degenerative) (diffuse) 330.0
      • insular 340
      • Krabbe's 330.0
      • mesial temporal 348.81
      • miliary 340
      • multiple 340
      • Pelizaeus-Merzbacher 330.0
      • progressive familial 330.0
      • senile 437.0
      • temporal 348.81
      • tuberous 759.5
    • 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
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 331.0 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2015 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.