ICD-10 Code F03.9 – Unspecified dementia, unspecified severity (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F03.9 – Unspecified dementia, unspecified severity
What it is
F03.9 identifies dementia when the record confirms dementia but does not specify the type or severity. Use it for documented cognitive decline that is not further classified.
Clinical signs
Typical features include impaired memory, reasoning, judgment, or daily functioning. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents dementia without naming Alzheimer’s disease, vascular dementia, or another specific subtype. It is also appropriate when severity is not stated and you cannot infer it from the note.
If the chart later identifies a more specific dementia type, code that diagnosis instead. Check documentation when the wording is vague, incomplete, or mixed with other cognitive disorders.
Do not use for
Do not use F03.9 for mild cognitive impairment, delirium, or normal age-related forgetfulness. Also avoid it when a specific dementia diagnosis is documented.
Coding tip
Query the provider if the note says “dementia” but leaves the type, cause, or severity unclear.