ICD-10 Code F31.78 – Bipolar disorder, in full remission, most recent episode mixed (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F31.78 – Bipolar disorder, in full remission, most recent episode mixed
What it is
This code identifies bipolar disorder with a history of a mixed episode, now in full remission. Use it when the patient no longer has active mood symptoms, but the diagnosis remains clinically relevant.
Clinical signs
Clinical features vary; refer to documentation. A mixed episode typically includes both manic and depressive symptoms during the same period, but this code applies only when the disorder is documented as in full remission.
When to use this code
Use F31.78 when the provider documents bipolar disorder, most recent episode mixed, and states the condition is in full remission. It is appropriate for follow-up visits, history review, or ongoing psychiatric care when no active episode is present.
Confirm that the chart supports both the mixed-episode history and the remission status. If the note describes current mania, depression, or partial remission, choose a different code.
Do not use for
Do not use this code for bipolar disorder that is currently active or only partially remitted. Check documentation if the most recent episode type is unspecified or if another bipolar subtype is recorded.
Coding tip
Code the episode status exactly as documented, because remission wording changes the ICD-10 choice.