Alzheimer's disease with early onset

This code signifies Alzheimer's disease that manifests before the age of 65. It is a progressive neurodegenerative disorder characterized by cognitive decline, memory loss, and behavioral changes, with an earlier age of symptom onset compared to typical Alzheimer's.

Apply this code when documentation clearly states a diagnosis of Alzheimer's disease and specifies an early onset, typically before age 65. Supporting documentation includes physician notes detailing the diagnosis, age of onset, and clinical presentation consistent with early-onset dementia.

• Ensure the physician explicitly documents "early onset" or an age of onset under 65 for Alzheimer's.
• Do not confuse with unspecified Alzheimer's or other forms of dementia without early onset specified.
• Sequence this code first when it is the primary reason for the encounter, followed by codes for any associated behavioral disturbances or complications.