2026 ICD-10-CM Diagnosis Code F91.1Conduct disorder, childhood-onset type

ICD-10-CM Codes›F01–F99›F90-F98›F91

ICD-10-CM F91.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F91.1 is a billable ICD-10-CM diagnosis code for conduct disorder, childhood-onset type. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Disruptive, impulse-control and conduct disorders.

Code Identity

ICD-10-CM Code
F91.1
Billable Status
Yes — Valid for Submission
Code Describes
Conduct disorder, childhood-onset type
Short Description
Conduct disorder, childhood-onset type
Same as the full description in the CMS dataset.
Parent Code
F91
Conduct disorders

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF90-F98Behavioral and emotional disorders with onset usually occurring in childhood and adolescence
CategoryF91Conduct disorders
This CodeF91.1Conduct disorder, childhood-onset type

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Aggressive unsocial conduct disorder
  • Behavioral problems at school
  • Childhood onset conduct-dissocial disorder
  • Childhood onset conduct-dissocial disorder with limited prosocial emotions
  • Childhood onset conduct-dissocial disorder with normal prosocial emotions
  • Conduct disorder
  • Conduct disorder - unsocialized
  • Conduct disorder in remission
  • Conduct disorder, childhood-onset type
  • Conduct disorder, solitary aggressive type
  • Group delinquent reaction of childhood
  • Problem behavior
  • Problematic behavior in children
  • Self destructive behavior
  • Unaggressive type unsocialized behavior disorder
  • Unsocialized aggressive reaction of childhood
  • X-linked intellectual disability and hypotonia with facial dysmorphism and aggressive behavior syndrome

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

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

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • 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

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MBD008
Disruptive, impulse-control and conduct disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Problem Behavior

    troublesome or disruptive behavioral displays.

  • Conduct Disorder

    a repetitive and persistent pattern of behavior in which the basic rights of others or major age-appropriate societal norms or rules are violated. these behaviors include aggressive conduct that causes or threatens physical harm to other people or animals, nonaggressive conduct that causes property loss or damage, deceitfulness or theft, and serious violations of rules. the onset is before age 18. (from dsm-iv, 1994)

  • Socialized Conduct Disorder

    a subtype of conduct disorder in which the affected child displays antisocial behavior despite still being able to make friends.

  • Undersocialized Conduct Disorder, Aggressive Type

    a subtype of conduct disorder in which the affected child displays aggressive, antisocial behavior and a lack of close friendships.

  • Conduct Disorder

    a disorder diagnosed in childhood or adolescence age group characterized by aggressive behavior, deceitfulness, destruction of property or violation of rules that is persistent and repetitive, and within a one year period.

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.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert F91.1 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
312.00 Unsocial aggress-unspec
Approximate The match is approximate rather than exact.
ICD-9-CM
312.81 Cndct dsrdr chldhd onst
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About F91.1Overview

Is F91.1 (Conduct disorders) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report conduct disorder, childhood-onset type on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of F91.1?

Under the General Equivalence Mappings, conduct disorder, childhood-onset type converts to ICD-9-CM 312.00 (unsocial aggress-unspec) and 312.81 (cndct dsrdr chldhd onst). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.