F91.9 ICD-10-CM

ICD-10-CM code F91.9 describes conduct disorder, unspecified. Conduct problems where the specific subtype is not documented. It is a billable, specific code valid for claim submission. It is grouped under the “Child & Adolescent Disorders” section of the mental, behavioral, and neurodevelopmental disorders chapter.

When to use F91.9

This group covers ADHD, conduct, oppositional defiant, attachment, tic, and elimination disorders with onset in childhood or adolescence, though the codes may be used regardless of current age. Select the presentation or type the documentation supports. For F91.9 specifically, conduct problems where the specific subtype is not documented.

Documentation & billing

Document the presentation (for ADHD), the onset type (for conduct disorder), and the symptom profile. Note the age of onset where it is clinically relevant.

Common pitfalls

• Using unspecified ADHD (F90.9) when the inattentive, hyperactive, or combined presentation is documented.
• Confusing conduct disorder with oppositional defiant disorder.
• Recording childhood-onset versus adolescent-onset conduct disorder incorrectly.

Common search terms for F91.9

Clinicians often look up F91.9 using plain-language terms. This code maps to:

Frequently asked questions