F91

Conduct disorders

F91 is the ICD-10-CM code for Conduct disorders. It is a non-billable category code — use a more specific child code such as F91.0 for billing.

Status

Header (non-billable)

Chapter

F01-F99

Subcodes

6

Edition

FY2026

F01-F99 Mental, Behavioral and Neurodevelopmental disorders

Disorders characterized by a repetitive and persistent pattern of dissocial, aggressive, or defiant conduct. Such behaviour should amount to major violations of age-appropriate social expectations; it should therefore be more severe than ordinary childish mischief or adolescent rebelliousness and should imply an enduring pattern of behaviour (six months or longer). Features of conduct disorder can also be symptomatic of other psychiatric conditions, in which case the underlying diagnosis should be preferred. Examples of the behaviours on which the diagnosis is based include excessive levels of fighting or bullying, cruelty to other people or animals, severe destructiveness to property, fire-setting, stealing, repeated lying, truancy from school and running away from home, unusually frequent and severe temper tantrums, and disobedience. Any one of these behaviours, if marked, is sufficient for the diagnosis, but isolated dissocial acts are not.