ICD-10 Code G31.09 – Other frontotemporal neurocognitive disorder (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G31.09 – Other frontotemporal neurocognitive disorder
What it is
This code identifies a neurocognitive disorder affecting the frontal and temporal lobes that does not fit a more specific frontotemporal dementia subtype. Use it when documentation supports frontotemporal degeneration but names another or unspecified variant.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include changes in behavior, personality, language, or executive function, with relative preservation of memory early in the illness.
When to use this code
Use G31.09 when the provider documents other frontotemporal neurocognitive disorder, frontotemporal degeneration, or a frontotemporal dementia variant not named elsewhere. You may also use it when the record clearly indicates a frontotemporal pattern but does not support a more specific code.
Do not use for
Do not use this code for Alzheimer disease, vascular dementia, or delirium. If the documentation specifies a different frontotemporal subtype, code the documented diagnosis instead.
Coding tip
Check the exact provider wording and code the most specific frontotemporal diagnosis documented.