ICD-10 Code F31.61 – Bipolar disorder, current episode mixed, mild (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F31.61 – Bipolar disorder, current episode mixed, mild
What it is
F31.61 identifies bipolar disorder with a current mixed episode that is mild. You use it when the patient has features of both mania and depression at the same time, and the episode is documented as mild.
Clinical signs
Clinical features vary; refer to documentation. Mixed episodes may include elevated or irritable mood, increased activity, decreased need for sleep, and depressive symptoms such as low mood or loss of interest occurring together.
When to use this code
Use this code when the provider documents bipolar disorder, current episode mixed, mild, or an equivalent statement. It fits outpatient, inpatient, and behavioral health records when the current episode severity is clearly described. Check documentation if the note mentions mixed features but does not specify mild.
Do not use for
Do not use this code for bipolar disorder in remission, a single manic or depressive episode, or when the episode severity is not mild. Check documentation if the record uses only “mixed features” without a confirmed bipolar diagnosis.
Coding tip
Match the code to the documented current episode and severity, not just the diagnosis history.