F06

F06 is an ICD-10 code used to classify certain mental and behavioral disorders that arise as a direct result of known physiological conditions, particularly those involving brain damage or dysfunction or other medical illnesses that affect mental function. It serves as a broad category for cognitive or behavioral disturbances that are secondary to identifiable medical conditions rather than primary psychiatric disorders. Subcodes within F06 are used to specify the presentation or underlying cause.

Common subcategories include F06.0 Amnestic disorder due to known physiological condition, F06.8 Other specified mental disorders due to brain damage and dysfunction and to a known physiological condition, and F06.9 Mental disorder due to brain damage and dysfunction and to a known physiological condition, unspecified. The exact subcodes can vary by ICD-10 revision and national adaptations, and some revisions may reorganize or rename these entries.

Clinical use and coding practice: Clinicians assign F06 when cognitive or behavioral symptoms are attributed to brain injury, systemic diseases, or other medical conditions that plausibly explain the psychiatric presentation. The code is used for documentation, billing, and epidemiological purposes, and it is typically accompanied by details about the underlying condition and its temporal relationship to the psychiatric symptoms. Accurate coding requires specifying the medical condition driving the mental disturbance and, when possible, the connection between the medical illness and the psychiatric presentation.

See also: ICD-10, mental and behavioral disorders, neuropsychiatric conditions.