F31Bipolar disorder

F31 is the ICD-10-CM diagnosis code for bipolar disorder. It belongs to block F30-F39 (mood [affective] disorders) and chapter 5 (mental, Behavioral and Neurodevelopmental disorders). It is a header code, so it can't be reported by itself; one of its 10 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: F31.0 (current episode hypomanic), F31.1 (current episode manic without psychotic features), F31.2 (current episode manic severe with psychotic features), F31.3 (current episode depressed, mild or moderate severity), F31.4 (current episode depressed, severe, without psychotic features), F31.5 (current episode depressed, severe, with psychotic features), F31.6 (current episode mixed), F31.7 (currently in remission) and 2 more.

Don't report F31 together with the conditions in its Excludes1 note: bipolar disorder, single manic episode (F30.-), major depressive disorder, single episode (F32.-) and major depressive disorder, recurrent (F33.-).

The conditions in its Excludes2 note aren't part of F31, but may be coded alongside it if the patient has both: cyclothymia (F34.0).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.