ICD-10 Code F06.8 – Other specified mental disorders due to known physiological condition (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F06.8 – Other specified mental disorders due to known physiological condition
What it is
F06.8 identifies a mental disorder caused by a known physiological condition when the presentation does not fit a more specific code. Use it when the documentation links the psychiatric change to an underlying medical condition.
Clinical signs
Clinical features vary; refer to documentation. Reports may describe mood, behavior, cognition, or perception changes that are attributed to a physiological cause, with evidence supporting a medical rather than primary psychiatric origin.
When to use this code
Use this code when the clinician documents a specific mental disorder due to a known physiological condition, but no narrower ICD-10-CM code applies. It may fit charted cases such as cognitive, emotional, or behavioral disturbance linked to a medical illness. Confirm the underlying condition is documented.
Do not use for
Do not use F06.8 for primary psychiatric disorders without a physiological cause. Also avoid it when the record supports a more specific F06 code or when documentation is unclear; check documentation.
Coding tip
Code the underlying physiological condition first when required, and support the mental disorder with the provider’s documented causal link.