ICD-10 Code F91.8 – Other conduct disorders (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F91.8 – Other conduct disorders
What it is
F91.8 identifies conduct problems in children or adolescents that do not fit a more specific conduct disorder category. Use it when the record describes persistent rule-breaking or aggressive behavior, but the exact subtype is not documented.
Clinical signs
Typical features include repeated violation of rules, deceitfulness, aggression, property destruction, or serious disobedience. Clinical features vary; refer to documentation.
When to use this code
Use F91.8 when the provider documents a conduct disorder and specifies “other” or gives behavior consistent with conduct disorder without a better-defined code. It is also appropriate when the chart lacks enough detail for a more specific conduct disorder diagnosis. Check documentation for age, duration, and behavior pattern.
Do not use for
Do not use this code for isolated misbehavior, normal adolescent rebellion, or problems better explained by another mental, developmental, or substance-related disorder. Do not assign it when a more specific conduct disorder code is documented.
Coding tip
Code from the provider’s exact wording and confirm whether the behavior is described as conduct disorder, not just disruptive behavior.