Unspecified mood [affective] disorder (F39)

The ICD-10 code F39 is used to identify an unspecified mood [affective] disorder, covering mood conditions that lack a more precise diagnosis. This code is applicable when symptoms do not clearly match other specific mood disorders.

This code groups a range of mood-related conditions, including those induced by substances such as methamphetamine or synthetic cannabinoids, as well as varying severities from mild to severe mood disorders. Terms like affective psychosis, episodic mood disorder, and secondary mood disorder relate to F39, helping coders and clinicians classify complex or unclear mood disturbances. Whether the mood disorder involves psychotic features; mood-congruent or mood-incongruent; or is in full or partial remission, F39 is the designated code. Using this ICD-10 code for unspecified mood disorders ensures accurate documentation when the precise mood disorder type is not determined, which is critical for care planning and medical record clarity. This makes F39 essential when symptoms suggest a mood disturbance but do not align with other specific mood disorder codes.