ICD-10-CM 2027
ICD-10 code for conduct childhood disorder
From the official ICD-10-CM alphabetic index entry “Disorder (of) › conduct (childhood)”. Page updated September 29, 2026.
About coding conduct childhood disorder
The ICD-10-CM code for conduct childhood disorder is F91.9 (Conduct disorder, unspecified). The official index lists 11 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on F91.9.
Within F91, choose F91.9 (Conduct disorder, unspecified) only when documentation doesn't support a more specific option: conduct disorder confined to family context (F91.0), conduct disorder, childhood-onset type (F91.1), conduct disorder, adolescent-onset type (F91.2), Oppositional defiant disorder (F91.3) and other conduct disorders (F91.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 886 (Behavioral and Developmental Disorders, relative weight 1.8678), in MDC 19 (Mental Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific conduct childhood disorder codes (official index)
- adjustment reaction
- adolescent onset type F91.2 — Conduct disorder, adolescent-onset type
- childhood onset type F91.1 — Conduct disorder, childhood-onset type
- compulsive F63.9 — Impulse disorder, unspecified
- confined to family context F91.0 — Conduct disorder confined to family context
- depressive F91.8 — Other conduct disorders
- group type F91.2 — Conduct disorder, adolescent-onset type
- hyperkinetic
- oppositional defiance F91.3 — Oppositional defiant disorder
- socialized F91.2 — Conduct disorder, adolescent-onset type
- solitary aggressive type F91.1 — Conduct disorder, childhood-onset type
- specified NEC F91.8 — Other conduct disorders
- unsocialized (aggressive) F91.1 — Conduct disorder, childhood-onset type
Common questions about conduct childhood disorder ICD-10 codes
What is the ICD-10 code for conduct childhood disorder?
- F91.9 — Conduct disorder, unspecified. More specific codes apply when the documentation supports them: F91.2, F91.1, F63.9, F91.0 and others below.
What is the ICD-10 code for adolescent onset type conduct childhood disorder?
- F91.2 — Conduct disorder, adolescent-onset type.
What is the ICD-10 code for childhood onset type conduct childhood disorder?
- F91.1 — Conduct disorder, childhood-onset type.
What is the ICD-10 code for compulsive conduct childhood disorder?
- F63.9 — Impulse disorder, unspecified.
What is the ICD-10 code for confined to family context conduct childhood disorder?
- F91.0 — Conduct disorder confined to family context.
What is the ICD-10 code for depressive conduct childhood disorder?
- F91.8 — Other conduct disorders.
What is the ICD-10 code for group type conduct childhood disorder?
- F91.2 — Conduct disorder, adolescent-onset type.
Is F91.9 billable?
- Yes. F91.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can F91.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict F91.9 as a principal diagnosis.
Is F91.9 a CC or MCC?
- No. F91.9 is neither a CC nor an MCC under MS-DRG v44.0.