2026 ICD-10-CM Diagnosis Code F91.8Other conduct disorders

ICD-10-CM Codes›F01–F99›F90-F98›F91

ICD-10-CM F91.8
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F91.8 is a billable ICD-10-CM diagnosis code for other conduct disorders. 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
F91.8
Billable Status
Yes — Valid for Submission
Code Describes
Other conduct disorders
Short Description
Other conduct disorders
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 CodeF91.8Other conduct disorders

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal sexual behavior
  • Abusive behavior towards animals
  • Aggression caused by ethanol
  • Aggressive behavior
  • Aggressive outburst
  • Aimless destructive behavior
  • Banging own head against object
  • Banging own head against own body parts
  • Behavioral problems at school
  • Bullying
  • Butting
  • Combativeness
  • Conduct disorder - unsocialized
  • Conduct disorder, undifferentiated type
  • Cruel behavior
  • Cruelty towards animals
  • Cruelty towards people
  • Defensive aggression
  • Depressive conduct disorder
  • Destructive behavior
  • Destructive behavior toward property
  • Displays of aggression
  • Dominance aggression
  • Fear-related aggression
  • Graffiti writing
  • Head-banging
  • Head-butting other person
  • Intermittent explosive outburst
  • Isolated explosive outburst
  • Neurotic delinquency
  • Offensive aggression
  • Play aggression
  • Primitive rage
  • Running away
  • Running away from home
  • Running away from school
  • Sexual offending behavior
  • Shoplifting
  • Stealing at school
  • Stealing from classmates
  • Stealing from home
  • Stealing from parents
  • Stealing from siblings
  • Stealing from work
  • Temper problem
  • Temper tantrum
  • Territorial aggression
  • Theft
  • Vandalism

Tabular List NotesGuidance

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

Inclusion Terms

  • Other specified conduct disorder
  • Other specified disruptive 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.

    • Delinquency(juvenile) (neurotic)
    • Disorder(of)
      • conduct (childhood)
        • depressive
    • Disorder(of)
      • conduct (childhood)
        • specified NEC
    • Disorder(of)
      • disruptive
        • specified NEC
    • Disturbance(s)
      • conduct
        • specified NEC
    • Stealing
      • child problem
    • Tantrum, child problem
    • Untruthfulness, child problem

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

  • Bullying

    aggressive behavior by a more powerful party that results in physical harm to or emotional distress of the victim.

  • Cyberbullying

    bullying that takes place over digital devices like cell phones and computers. it includes sending, posting, or sharing negative, harmful, false, or mean content about someone else. it can include sharing personal or private information about someone else causing embarrassment or humiliation. (from https://www.stopbullying.gov)

  • Occupational Stress

    adverse psychological and behavioral reactions caused by the pressures and demands of employers or clients or other factors, such as the physical environment of the workplace, workplace violence; or workplace bullying.

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 F91.8 to ICD-9-CMHistory

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

ICD-9-CM
312.10 Unsocial unaggress-unsp
Approximate The match is approximate rather than exact.
ICD-9-CM
312.89 Other conduct disorder
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 F91.8Overview

Is F91.8 (Conduct disorders) a billable code?

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

What is the ICD-9 equivalent of F91.8?

Under the General Equivalence Mappings, other conduct disorders converts to ICD-9-CM 312.10 (unsocial unaggress-unsp) and 312.89 (other conduct disorder). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.