F31.9 Bipolar disorder, unspecified
ICD-10-CM · CMS code reference
F31.9 is bipolar disorder with no further detail in the record, and it also covers the term manic depression. If the current episode type, severity or remission status is documented, use the matching code from F31.0 to F31.78; for bipolar II, use F31.81.
Coding notes
From the ICD-10-CM FY2027 (effective October 1, 2026) tabular list. Notes on a parent code or category apply here too.
Also covers
- Manic depression
Includes
- bipolar I disorder
- bipolar type I disorder
- manic-depressive illness
- manic-depressive psychosis
- manic-depressive reaction
- seasonal bipolar disorder
Excludes1
Not coded together with this code. The exception is when the two conditions are unrelated to each other.
- bipolar disorder, single manic episode (F30.-)
- major depressive disorder, single episode (F32.-)
- major depressive disorder, recurrent (F33.-)
Excludes2
Not part of this code, but both can be coded when both are documented.
- cyclothymia (F34.0)
Related codes
F31.73Bipolar disorder, in partial remission, most recent episode manic ICD-10-CMF31.74Bipolar disorder, in full remission, most recent episode manic ICD-10-CMF31.75Bipolar disorder, in partial remission, most recent episode depressed ICD-10-CMF31.76Bipolar disorder, in full remission, most recent episode depressed ICD-10-CMF31.77Bipolar disorder, in partial remission, most recent episode mixed ICD-10-CMF31.78Bipolar disorder, in full remission, most recent episode mixed ICD-10-CMF31.81Bipolar II disorder ICD-10-CMF31.89Other bipolar disorder ICD-10-CM
Common questions
Is F31.9 a billable code?
Yes. F31.9 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.