ICD-10 Code F31.30 – Bipolar Disorder, Current Episode Depressed, Mild or Moderate Severity, Unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F31.30 – Bipolar disorder, current episode depressed, mild or moderate severity, unspecified
What it is
This code identifies bipolar disorder with a current depressive episode that is mild or moderate, without specification of the bipolar subtype. Use it when the record clearly documents a depressed episode and does not name a more specific bipolar category.
Clinical signs
Typical findings include persistent low mood, loss of interest, fatigue, sleep or appetite change, and impaired concentration. Clinical features vary; refer to documentation, especially for evidence of a current depressive episode within bipolar disorder.
When to use this code
Use F31.30 when the provider documents bipolar disorder, current episode depressed, and describes the episode as mild or moderate, but does not specify type I or type II. It also fits when the chart states bipolar disorder with depression and leaves the subtype unspecified. If the severity is not documented, check documentation.
Do not use for
Do not use this code for bipolar disorder in remission, manic episodes, mixed episodes, or depressive disorders without bipolar disorder. If the record specifies a different bipolar subtype or severity, code that documented diagnosis instead.
Coding tip
Confirm both the current episode and the documented severity before assigning F31.30.