ICD-10 Code F39 – Unspecified mood [affective] disorder (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F39 – Unspecified mood [affective] disorder
What it is
F39 identifies a mood disorder when the record shows a depressive or bipolar-type condition, but the documentation does not specify the exact subtype. Use it for a nonspecific affective disorder diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings include persistent low mood, loss of interest, mood instability, or other affective symptoms without enough detail for a more specific diagnosis.
When to use this code
Use F39 when the provider documents an unspecified mood disorder, unspecified affective disorder, or a mood disturbance that is not further classified. It is also appropriate when the note confirms a mood disorder but does not distinguish depressive, bipolar, or other subtypes. Check documentation before selecting a more specific code.
Do not use for
Do not use F39 when the record supports a specific mood disorder such as major depressive disorder or bipolar disorder. Also avoid it if the documentation only describes temporary emotional distress without a diagnosed mood disorder.
Coding tip
If the clinician names a specific mood disorder anywhere in the chart, code that diagnosis instead of F39.