ICD-10 Code F02.A1 – Dementia in other diseases classified elsewhere, mild, with behavioral disturbance (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F02.A1 – Dementia in other diseases classified elsewhere, mild, with behavioral disturbance
What it is
This code identifies mild dementia caused by another underlying disease, with behavioral disturbance. Use it when the record shows cognitive decline plus behavioral symptoms, and the dementia is due to a separate documented condition.
Clinical signs
Typical findings include mild memory or thinking impairment with behavioral changes such as agitation, irritability, or other disturbance. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents dementia secondary to another disease and specifies the dementia as mild with behavioral disturbance. The underlying cause should also be documented and coded separately when appropriate. If severity or behavior is not stated, check documentation.
Do not use for
Do not use this code for dementia without behavioral disturbance, or when the record does not support a mild severity level. Do not use it for unspecified dementia or when the cause is not documented.
Coding tip
Confirm both the underlying disease and the behavioral disturbance in the note before assigning F02.A1.