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F91

⚠ Non-billable (Header)

Conduct disorders

Mental, Behavioral and Neurodevelopmental disorders (F01-F99)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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❌ Excludes1

direct

Cannot be coded with F91

  • • antisocial behavior (Z72.81-)
  • • antisocial personality disorder (F60.2)

⚠️ Excludes2

direct

May be coded together if both conditions coexist

  • • conduct problems associated with attention-deficit hyperactivity disorder (F90.-)
  • • mood [affective] disorders (F30-F39)
  • • pervasive developmental disorders (F84.-)
  • • schizophrenia (F20.-)

Child Codes (6)

F91.0Conduct disorder confined to family contextF91.1Conduct disorder, childhood-onset typeF91.2Conduct disorder, adolescent-onset typeF91.3Oppositional defiant disorderF91.8Other conduct disordersF91.9Conduct disorder, unspecified

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Code Information

CodeF91
BillableNo — Header code
CategoryMental, Behavioral and Neurodevelopmental disorders (F01-F99)
Excludes12 rule(s)
Excludes24 note(s)
Child codes6

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)