Specific code 2009 ICD-9-CM Diagnosis Code 331.0
Alzheimer's disease
  • ICD-9-CM 331.0 will be replaced by an equivalent ICD-10-CM code (or codes) when the United States transitions from ICD-9-CM to ICD-10-CM on October 1, 2015.
  • ICD-9-CM 331.0 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
  • You are viewing the 2009 version of ICD-9-CM 331.0.
  • More recent version(s) of ICD-9-CM 331.0: 2010 2011 2012 2013 2014.
Disease 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 (disorder)
  • 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 (disorder)
  • 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
Convert to ICD-10-CM: 331.0 converts approximately to:
  • 2014 ICD-10-CM G30.9 Alzheimer's disease, unspecified
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) 341.9
      • 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
      • infantile (degenerative) (diffuse) 330.0
      • insular 340
      • Krabbe's 330.0
      • miliary 340
      • multiple 340
      • Pelizaeus-Merzbacher 330.0
      • progressive familial 330.0
      • senile 437.0
      • 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 2009 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.