ICD-10 Code F03.C3 – Unspecified dementia, severe, with mood disturbance (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F03.C3 – Unspecified dementia, severe, with mood disturbance
What it is
This code identifies severe dementia that is not otherwise specified, with documented mood disturbance. Use it when the record shows dementia plus mood symptoms, but does not name a more specific dementia type.
Clinical signs
Expect major cognitive impairment affecting daily function, along with mood changes such as depression, anxiety, irritability, or emotional lability. Clinical features vary; refer to documentation.
When to use this code
Use F03.C3 when the provider documents unspecified dementia and clearly states the condition is severe and accompanied by mood disturbance. It fits cases where the dementia type is not established or not documented. Check documentation if severity or mood features are unclear.
Do not use for
Do not use this code if the chart identifies a specific dementia subtype, such as Alzheimer’s disease or vascular dementia. Do not assign it when mood symptoms are present without documented dementia.
Coding tip
Confirm both severity and mood disturbance in the provider note before coding, and query if either element is missing.