ICD-10 Code F02.B3 – Dementia in other diseases classified elsewhere, moderate, with mood disturbance (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F02.B3 – Dementia in other diseases classified elsewhere, moderate, with mood disturbance
What it is
This code identifies moderate dementia caused by an underlying disease, with associated mood disturbance. Use it when the dementia is documented as secondary to another condition and the mood change is part of the diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Moderate dementia commonly includes noticeable memory loss, impaired reasoning, and reduced ability to manage daily activities, along with documented mood disturbance such as depression, irritability, or emotional lability.
When to use this code
Use F02.B3 when the provider documents dementia due to another disease and specifies moderate severity with mood disturbance. The underlying disease is coded separately, so you should confirm both the causal condition and the dementia severity in the record.
Do not use for
Do not use this code for dementia without a documented mood disturbance, or when the cause is not stated as another disease. Check documentation if the severity is mild, severe, or unspecified.
Coding tip
Verify that the record links the dementia to an underlying condition and explicitly notes mood disturbance before assigning F02.B3.