ICD-10 Code F03.918 – Unspecified dementia, unspecified severity, with other behavioral disturbance (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F03.918 – Unspecified dementia, unspecified severity, with other behavioral disturbance
What it is
This code identifies dementia when the type and severity are not documented, but the patient has behavioral disturbance beyond memory loss. Use it when the record supports dementia with additional disruptive or unusual behavior.
Clinical signs
Typical findings include impaired memory and thinking plus behaviors such as agitation, wandering, resistance, or other nonpsychotic disturbances. Clinical features vary; refer to documentation.
When to use this code
Use this code when the clinician documents unspecified dementia and separately notes behavioral disturbance, but does not identify a more specific dementia type. It also fits when severity is not stated. Check documentation if the behavior is described without a clear dementia diagnosis.
Do not use for
Do not use this code for dementia without behavioral disturbance, or when the chart specifies a more exact dementia subtype or severity. Avoid it if the behavior is better explained by another condition.
Coding tip
Confirm both elements are present in the record: unspecified dementia and behavioral disturbance.