ICD-10 Code F02.C4 – Dementia in other diseases classified elsewhere, severe, with anxiety (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F02.C4 – Dementia in other diseases classified elsewhere, severe, with anxiety
What it is
This code identifies severe dementia caused by another underlying disease, with anxiety as an associated behavioral disturbance. Use it when the dementia is secondary to a documented condition and the anxiety is part of the clinical picture.
Clinical signs
Expect marked cognitive decline with major impairment in memory, judgment, communication, and daily functioning. Anxiety may appear as excessive worry, restlessness, or agitation; clinical features vary, so refer to documentation.
When to use this code
Use this code when the record states dementia due to another disease and clearly documents severe severity plus anxiety. It is appropriate for visits where the underlying cause is known and the anxiety is linked to the dementia diagnosis. Check documentation if severity or behavioral features are not explicitly stated.
Do not use for
Do not use this code for primary dementia disorders, mild or moderate dementia, or anxiety that is documented separately without a dementia-related link. If the record does not support an “other disease” cause, check documentation.
Coding tip
Code the underlying disease first when required, and confirm that both severe dementia and anxiety are documented before assigning F02.C4.