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ICD-10 Corner: Coding Alzheimer's Disease in ICD-10-CM

By Connie L. Zeller, CPC
March 05, 2013

Codes for Alzheimer’s disease are found in Chapter 6 of ICD-10-CM, Diseases of the Nervous System (G00-G99), and the same chapter as in ICD-9. However, there is greater specificity within the code set for diseases of the nervous system in ICD-10-CM. Alzheimer’s disease in ICD-9 has one code: 331.0.

There are 4 codes in ICD-10-CM:

  • G30.0 Alzheimer’s disease with early onset
  • G30.1 Alzheimer’s disease with late onset
  • G30.8 Other Alzheimer’s disease
  • G30.9 Alzheimer’s disease unspecified

Category G30, Alzheimer’s disease instructs coders to assign an additional code when associated with:

  • Delirium, if applicable (F05)
  • Dementia with behavioral disturbance (F02.81)
  • Dementia without behavioral disturbance (F02.80)
Thorough documentation of symptoms and tests will be required by physicians. Patients suspected of having Alzheimer’s disease are given neurological tests. Also, a CT scan is ordered to rule out the possibility of stroke, brain tumor, or other conditions that may cause symptoms similar to Alzheimer’s disease. For example, if the patient is younger than age 60, and exhibiting symptoms; diagnosis code G30.0, Alzheimer’s disease with early onset will be assigned.
 

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