ICD-10 Code F31.89 – Other bipolar disorder (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F31.89 – Other bipolar disorder
What it is
F31.89 identifies bipolar disorder that does not fit a more specific bipolar subtype. Use it when the record confirms bipolar disorder, but the documentation does not support a narrower code.
Clinical signs
Clinical features vary; refer to documentation. Bipolar disorder generally involves episodes of elevated or irritable mood and periods of depression, with changes in energy, activity, sleep, and judgment.
When to use this code
Use this code when the clinician documents bipolar disorder and specifies an other or unspecified presentation that is not captured by a more specific F31 category. It is appropriate when the note supports bipolar illness but does not identify the exact episode type or subtype. Check documentation if the record is incomplete.
Do not use for
Do not use this code if the documentation clearly supports a different bipolar subtype, such as bipolar I, bipolar II, or a current episode code. Do not use it for depressive disorders without bipolar features.
Coding tip
Code the most specific bipolar diagnosis documented, and query the provider when the subtype or current episode is unclear.