ICD-10 Code F06.34 – Mood disorder due to known physiological condition with mixed features (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F06.34 – Mood disorder due to known physiological condition with mixed features
What it is
This code describes a mood disturbance caused by an identified medical condition, with both depressive and manic symptoms present. Use it when the record links the psychiatric presentation to a known physiological cause.
Clinical signs
Clinical features vary; refer to documentation. Mixed features may include concurrent low mood, irritability, elevated energy, pressured speech, or reduced need for sleep, but the key point is the documented mood disturbance from a medical condition.
When to use this code
Use this code when the clinician documents a mood disorder due to a known physiological condition and specifies mixed features. It fits situations where the underlying medical cause is identified and the mood symptoms are not better coded as a primary bipolar disorder. If the cause or features are unclear, check documentation.
Do not use for
Do not use this code for bipolar disorder or for mood symptoms without a documented physiological cause. Do not assign it when the record only states depression, mania, or mood change without the mixed-features specification.
Coding tip
Confirm both the medical cause and the mixed-features wording in the assessment before coding F06.34.