ICD-10 Code F07.9 – Unspecified personality and behavioral disorder due to known physiological condition (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F07.9 – Unspecified personality and behavioral disorder due to known physiological condition
What it is
This code identifies a personality or behavioral change caused by a known physiological condition, when the specific type is not documented. Use it when the record confirms an organic cause but does not name a more precise disorder.
Clinical signs
Clinical features vary; refer to documentation. You may see changes in personality, mood, impulse control, or social behavior that are linked to an underlying medical condition rather than a primary psychiatric disorder.
When to use this code
Use F07.9 when the clinician documents personality or behavioral disturbance due to a known physiological condition, but does not specify the exact syndrome. It is appropriate when the cause is established and the presentation is recorded only in general terms. Check documentation if the note does not clearly connect the behavior change to a medical condition.
Do not use for
Do not use this code for primary personality disorders, substance-related disorders, or behavioral symptoms without a documented physiological cause. If the record is more specific, code the named disorder instead.
Coding tip
Query when the note says “behavioral change” or “personality change” but does not clearly identify the underlying physiological condition.