F91.1 Conduct disorder, childhood-onset type

Billable ICD-10-CM code, FY2026.

Applicable to

• Unsocialized conduct disorder
• Conduct disorder, solitary aggressive type
• Unsocialized aggressive disorder

Applies from F91 Conduct disorders

Excludes1 (never code together)

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

Excludes2 (not included here)

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

Risk adjustment (HCC)

• RxHCC V08: HCC 133 — Anxiety and Other Psychiatric Disorders

MS-DRG index

Defines the logic of DRG(s) 886 in MDC 19.

Approximate ICD-9-CM (GEMs)

• 312.00 Undersocialized conduct disorder, aggressive type, unspecified (approximate)
• 312.81 Conduct disorder, childhood onset type (approximate)

Code annotations containing back-references to F91.1

Back-references to F91

• Type 1 Excludes: F60.2 Antisocial personality disorder ("conduct disorders (F91.-)")
• Type 2 Excludes: F63.1 Pyromania ("conduct disorders (F91.-)")
• Type 1 Excludes: Z72.81 Antisocial behavior ("conduct disorders (F91.-)")

Diagnosis Index entries for F91.1

• Disorder (of) › aggressive, unsocialized
• Disorder (of) › conduct (childhood) › childhood onset type
• Disorder (of) › conduct (childhood) › solitary aggressive type
• Disorder (of) › conduct (childhood) › unsocialized (aggressive)
• Disorder (of) › unsocialized aggressive
• Disturbance (s) › conduct › unsocialized

Nearby codes

• F91 Conduct disorders
• F91.0 Conduct disorder confined to family context
• F91.1 Conduct disorder, childhood-onset type (this code)
• F91.2 Conduct disorder, adolescent-onset type
• F91.3 Oppositional defiant disorder
• F91.8 Other conduct disorders
• F91.9 Conduct disorder, unspecified