ICD-10 Code F02.C11 – Dementia in other diseases classified elsewhere, severe, with agitation (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F02.C11 – Dementia in other diseases classified elsewhere, severe, with agitation
What it is
This code identifies severe dementia caused by another underlying disease, with agitation documented. Use it when the dementia is secondary and the chart specifies agitation as an associated behavioral disturbance.
Clinical signs
Expect marked cognitive decline with major impairment in daily function, plus agitation such as restlessness, irritability, or disruptive behavior. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider links dementia to another disease and documents the severity as severe. The record should also clearly state agitation, not just confusion or general behavioral change. If the underlying disease is not documented, check documentation before coding.
Do not use for
Do not use it for dementia without a stated underlying disease, or when agitation is not documented. Do not assign it for mild or unspecified severity.
Coding tip
Verify both the secondary cause and the severity statement before assigning F02.C11.