F31.9 Bipolar disorder, unspecified

Billable ICD-10-CM code, FY2026.

Applicable to

• Manic depression

Applies from F31 Bipolar disorder

Includes

• bipolar I disorder
• bipolar type I disorder
• manic-depressive illness
• manic-depressive psychosis
• manic-depressive reaction
• seasonal bipolar disorder

Excludes1 (never code together)

• bipolar disorder, single manic episode (F30.-)
• major depressive disorder, single episode (F32.-)
• major depressive disorder, recurrent (F33.-)

Excludes2 (not included here)

• cyclothymia (F34.0)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 154 — Bipolar Disorders without Psychosis
• CMS-HCC V22: HCC 58 — Major Depressive, Bipolar, and Paranoid Disorders
• RxHCC V08: HCC 131 — Bipolar Disorders
• ESRD V24: HCC 59

MS-DRG index

Defines the logic of DRG(s) 885 in MDC 19.

Approximate ICD-9-CM (GEMs)

• 296.80 Bipolar disorder, unspecified (approximate)

Code annotations containing back-references to F31.9

Back-references to F31

• Type 2 Excludes: F06.3 Mood disorder due to known physiological condition ("mood disorders, not due to known physiological condition or unspecified (F30-F39)")
• Type 1 Excludes: F30 Manic episode ("bipolar disorder (F31.-)")
• Type 1 Excludes: F32 Depressive episode ("bipolar disorder (F31.-)")
• Type 1 Excludes: F33 Major depressive disorder, recurrent ("bipolar disorder (F31.-)")
• Type 2 Excludes: F44.2 Dissociative stupor ("manic stupor (F30, F31)")
• Type 2 Excludes: F63.0 Pathological gambling ("excessive gambling by manic patients (F30, F31)")
• Type 2 Excludes: F63.2 Kleptomania ("depressive disorder with stealing (F31.-, F32.-, F33.-)")
• Type 2 Excludes: F90 Attention-deficit hyperactivity disorders ("mood [affective] disorders (F30-F39)")
• Type 2 Excludes: F91 Conduct disorders ("mood [affective] disorders (F30-F39)")
• Type 2 Excludes: F93.0 Separation anxiety disorder of childhood ("mood [affective] disorders (F30-F39)")
• Type 1 Excludes: R40.1 Stupor ("depressive stupor (F31.-, F32.-, F33.-)")

Diagnosis Index entries for F31.9

• Disorder (of) › bipolar (I) (seasonal) (type 1)
• Disorder (of) › bipolar (I) (seasonal) (type 1) › current (or most recent) episode › depressed
• Disorder (of) › bipolar (I) (seasonal) (type 1) › current (or most recent) episode › manic
• Manic depression

Nearby codes

• F31.77 Bipolar disorder, in partial remission, most recent episode mixed
• F31.78 Bipolar disorder, in full remission, most recent episode mixed
• F31.8 Other bipolar disorders
• F31.81 Bipolar II disorder
• F31.89 Other bipolar disorder
• F31.9 Bipolar disorder, unspecified (this code)