F91Conduct disorders

F91 is the ICD-10-CM diagnosis code for conduct disorders. It belongs to block F90-F98 (behavioral and emotional disorders with onset usually occurring in childhood and adolescence) and chapter 5 (mental, Behavioral and Neurodevelopmental disorders). It is a header code, so it can't be reported by itself; one of its 6 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: F91.0 (context), F91.1 (type), F91.2 (type), F91.3 (disorder), F91.8 (disorders) and F91.9 (unspecified).

Don't report F91 together with the conditions in its Excludes1 note: antisocial behavior (Z72.81-) and antisocial personality disorder (F60.2).

The conditions in its Excludes2 note aren't part of F91, but may be coded alongside it if the patient has both: conduct problems associated with attention-deficit hyperactivity disorder (F90.-), mood [affective] disorders (F30-F39), pervasive developmental disorders (F84.-) and schizophrenia (F20.-).

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