ICD-10 Code F31.4 – Bipolar disorder, current episode depressed, severe, without psychotic features (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F31.4 – Bipolar disorder, current episode depressed, severe, without psychotic features
What it is
This code identifies bipolar disorder with a current depressive episode that is severe, but without hallucinations or delusions. Use it when documentation clearly states bipolar depression at this severity level.
Clinical signs
Typical findings include persistent depressed mood, loss of interest, low energy, sleep or appetite changes, and impaired functioning. Clinical features vary; refer to documentation for evidence of severe depression and absence of psychotic features.
When to use this code
Use F31.4 when the provider documents bipolar disorder and specifies the current episode is depressed and severe. Apply it for encounters focused on evaluation, management, or follow-up of that episode. Check documentation if the record does not clearly state the episode type or severity.
Do not use for
Do not use this code for bipolar disorder in a manic, mixed, or unspecified episode. It is also not appropriate if psychotic features are documented or if the chart only says depression without bipolar disorder.
Coding tip
Verify that both “severe” and “without psychotic features” are explicitly documented before assigning F31.4.