ICD-10 Code F31.77 – Bipolar disorder, in partial remission, most recent episode mixed (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F31.77 – Bipolar disorder, in partial remission, most recent episode mixed
What it is
This code identifies bipolar disorder with a recent mixed episode that is now only partly in remission. You should use it when the record shows ongoing bipolar illness, but the mixed episode is improving rather than fully resolved.
Clinical signs
Clinical features vary; refer to documentation. Mixed episodes may include both manic and depressive symptoms occurring together or rapidly shifting, with partial remission indicating fewer or less severe current symptoms.
When to use this code
Use this code when the provider documents bipolar disorder, a most recent mixed episode, and partial remission. It fits follow-up visits where symptoms persist but are not at full episode intensity. Check documentation if the note does not clearly state remission status or episode type.
Do not use for
Do not use it for bipolar disorder in full remission, or when the most recent episode is manic, depressive, or unspecified. If the chart only says “bipolar disorder” without episode details, check documentation.
Coding tip
Match both the current status and the most recent episode exactly as documented before assigning F31.77.