2026 ICD-10-CM Diagnosis Code F91Conduct disorders
F91 is a non-billable ICD-10-CM category code for conduct disorders, so it cannot be submitted on claims. Use a more specific code from this category instead, such as F91.0, F91.1, F91.2, and F91.3.
Code Identity
Code Classification
Specific Coding for Conduct disordersOverview
Non-specific codes like F91 require more characters. Use one of these billable codes instead:
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Type 1 Excludes
Type 2 Excludes
- conduct problems associated with attention-deficit hyperactivity disorder F90
- mood affective disorders F30 F39
- pervasive developmental disorders F84
- schizophrenia F20
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Patient EducationClinical
Child Behavior Disorders
All kids misbehave some times. And some may have temporary behavior problems due to stress. For example, the birth of a sibling, a divorce, or a death in the family may cause a child to act out. Behavior disorders are more serious. They involve a pattern of hostile, aggressive, or disruptive behaviors for more than 6 months.
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Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
