ICD-10 Code F03.A3 – Unspecified dementia, mild, with mood disturbance (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F03.A3 – Unspecified dementia, mild, with mood disturbance
What it is
This code describes a mild dementia syndrome when the specific type is not documented and mood symptoms are present. Use it when cognitive decline is documented along with a mood disturbance, but the underlying dementia cause remains unspecified.
Clinical signs
Expect mild memory or thinking problems that affect daily function, with associated mood changes such as depression, anxiety, or emotional lability. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents unspecified dementia and also notes a mood disturbance, and the dementia is described as mild. It fits cases where the record supports dementia-related cognitive impairment but does not identify a more specific dementia type. Check documentation if severity or mood features are unclear.
Do not use for
Do not use it when the dementia type is specified, such as Alzheimer’s disease or vascular dementia. Also avoid it if mood symptoms are present without documented dementia or if the record does not support mild severity.
Coding tip
Confirm both elements in the note: unspecified dementia and mood disturbance, plus mild severity, before assigning F03.A3.