ICD-10 Code F03.C11 – Unspecified dementia, severe, with agitation (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F03.C11 – Unspecified dementia, severe, with agitation
What it is
This code identifies severe dementia when the type is not specified and agitation is documented. Use it for advanced cognitive decline with disruptive behavior, but without a more specific dementia diagnosis.
Clinical signs
Common findings include major memory and thinking impairment, loss of independence, and behavioral agitation such as restlessness or irritability. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents unspecified dementia as severe and notes agitation. It is appropriate when the record does not identify a more specific dementia type, such as Alzheimer’s or vascular dementia. Check documentation if severity or agitation is unclear.
Do not use for
Do not use it if the dementia type is specified and a more specific code is available. Do not assign it for mild or moderate dementia, or for agitation without documented severe dementia.
Coding tip
Confirm both severity and agitation are explicitly documented before selecting F03.C11.