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F91.9

✓ Billable

Conduct disorder, unspecified

Mental, Behavioral and Neurodevelopmental disorders (F01-F99)

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Also Known As

Behavioral disorder NOSConduct disorder NOSDisruptive behavior disorder NOSDisruptive disorder NOS

❌ Excludes1

inherited from F91

Rules from parent category F91: Conduct disorders

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

⚠️ Excludes2

inherited from F91

Rules from parent category F91: Conduct disorders

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

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Code Information

CodeF91.9
BillableYes
ParentF91
CategoryMental, Behavioral and Neurodevelopmental disorders (F01-F99)
Excludes12 rule(s)
Excludes24 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)