Alzheimer's disease with late onset

This code signifies Alzheimer's disease that manifests in individuals typically aged 65 years or older. It is characterized by progressive cognitive decline, memory impairment, and functional deficits, consistent with the most common form of Alzheimer's.

Apply this code when documentation clearly states a diagnosis of Alzheimer's disease and specifies "late onset" or indicates the patient's age at onset was 65 or older. Supporting documentation includes physician's notes, neurological evaluations, and cognitive assessments confirming the diagnosis and onset timing.

• Differentiate from early-onset Alzheimer's, which has a separate code.
• Ensure the medical record explicitly states "late onset" or provides an age of onset consistent with late onset.
• Sequence this code as the primary diagnosis when Alzheimer's is the reason for the encounter, or as a secondary diagnosis when it's a comorbidity.