ICD-10-CM 2027
ICD-10 code for manic depression
From the official ICD-10-CM alphabetic index entry “Manic depression”. Page updated September 29, 2026.
About coding manic depression
The ICD-10-CM code for manic depression is F31.9 (Bipolar disorder, unspecified).
Within F31, choose F31.9 (unspecified) only when documentation doesn't support a more specific option: current episode hypomanic (F31.0), current episode manic without psychotic features (F31.1), current episode manic severe with psychotic features (F31.2), current episode depressed, mild or moderate severity (F31.3), current episode depressed, severe, without psychotic features (F31.4), current episode depressed, severe, with psychotic features (F31.5), current episode mixed (F31.6), currently in remission (F31.7) and 1 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 885 (Psychoses, relative weight 1.3901), in MDC 19 (Mental Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about manic depression ICD-10 codes
What is the ICD-10 code for manic depression?
- F31.9 — Bipolar disorder, unspecified.
Is F31.9 billable?
- Yes. F31.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can F31.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict F31.9 as a principal diagnosis.
Is F31.9 a CC or MCC?
- No. F31.9 is neither a CC nor an MCC under MS-DRG v44.0.