ICD-10 Code F03.C4 – Unspecified Dementia, Severe, with Anxiety (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F03.C4 – Unspecified dementia, severe, with anxiety
What it is
This code identifies severe dementia when the type is not specified and anxiety is documented. It tells you the patient has advanced cognitive decline with an anxiety component, without naming a specific dementia cause.
Clinical signs
Severe dementia usually involves major impairment in memory, reasoning, communication, and daily function. Anxiety may appear as persistent worry, agitation, restlessness, or distress; clinical features vary, refer to documentation.
When to use this code
Use this code when the record states unspecified dementia and clearly documents severity as severe plus anxiety. Apply it when the provider does not identify Alzheimer’s disease, vascular dementia, or another specific dementia type.
Check documentation if the note only says “dementia with anxiety” or does not confirm severity. Do not assign it from symptoms alone; the diagnosis and severity should be stated by the provider.
Do not use for
Do not use this code for mild or moderate dementia, or when a specific dementia diagnosis is documented. Also avoid it if anxiety is present without a documented dementia diagnosis.
Coding tip
Verify both “unspecified dementia” and “severe” are documented before assigning F03.C4.