Conduct disorder, adolescent-onset type

This code represents a persistent pattern of behavior in an adolescent (onset after age 10) that violates the basic rights of others or major age-appropriate societal norms or rules. Behaviors include aggression to people and animals, destruction of property, deceitfulness or theft, and serious violations of rules. The disturbance causes clinically significant impairment in social, academic, or occupational functioning.

Assign this code when documentation clearly indicates a diagnosis of conduct disorder with an onset of symptoms after the age of 10 years. Supporting documentation should detail the specific behavioral patterns, their duration, and the resulting functional impairment in an adolescent patient. This code is appropriate when the criteria for conduct disorder are met, and the onset is explicitly noted as adolescent.

• Differentiate carefully from childhood-onset type (F91.1) based on the age of symptom onset.
• Ensure documentation specifies the onset age to accurately distinguish from unspecified conduct disorder (F91.9).
• Consider co-occurring mental health conditions, such as ADHD or substance use disorders, and code them additionally.