ICD-10 Code F02.A3 – Dementia in Other Diseases Classified Elsewhere, Mild, with Mood Disturbance (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F02.A3 – Dementia in other diseases classified elsewhere, mild, with mood disturbance
What it is
This code identifies mild dementia caused by another underlying disease, with a documented mood disturbance. Use it when the dementia is secondary to a separate condition and the mood change is part of the recorded presentation.
Clinical signs
Typical findings include mild cognitive decline affecting daily function, along with mood symptoms such as depression, anxiety, or emotional lability. Clinical features vary; refer to documentation.
When to use this code
Use F02.A3 when the record clearly links the dementia to another disease and describes the dementia as mild. The chart should also document a mood disturbance, not just memory loss or confusion alone. If the underlying condition is not stated, check documentation.
Do not use for
Do not use this code for dementia without mood disturbance or for dementia not described as mild. Do not assign it when the dementia is not documented as secondary to another disease.
Coding tip
Confirm both the underlying disease and the mood disturbance before coding, and follow any sequencing rules for the associated condition.