2026 ICD-10-CM Diagnosis Code F91.3Oppositional defiant disorder

ICD-10-CM Codes›F01–F99›F90-F98›F91

ICD-10-CM F91.3
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F91.3 is a billable ICD-10-CM diagnosis code for oppositional defiant disorder. 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
F91.3
Billable Status
Yes — Valid for Submission
Code Describes
Oppositional defiant disorder
Short Description
Oppositional defiant disorder
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 CodeF91.3Oppositional defiant disorder

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Defiant behavior
  • Discipline problem
  • Disobedience
  • Feeling angry
  • Feeling irritable
  • Irritability and anger
  • Oppositional defiant disorder
  • Oppositional defiant disorder co-occurrent with chronic irritability-anger
  • Oppositional defiant disorder co-occurrent with chronic irritability-anger with normal prosocial emotions
  • Oppositional defiant disorder without chronic irritability-anger
  • Oppositional defiant disorder without chronic irritability-anger with limited prosocial emotions
  • Oppositional defiant disorder without chronic irritability-anger with normal prosocial emotions
  • School discipline problem

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)
      • conduct (childhood)
        • oppositional defiance
    • Disorder(of)
      • defiant oppositional
    • Disorder(of)
      • oppositional defiant
    • Disturbance(s)
      • emotions specific to childhood and adolescence
        • with
          • oppositional disorder

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

  • Oppositional Defiant Disorder

    a repetitive and persistent pattern of behavior that develops in childhood and is characterized as recurrent disobedient, overall negative or agitated mood, a quarrelsome attitude or being vengeful toward authority figures. unlike in conduct disorder defiant behaviors in oppositional defiant disorders typically do not involve aggression, destruction, theft, or deceit. oppositional defiant disorder, conduct disorder and attention deficit and hyperactivity disorder sometimes co-occur.

  • Oppositional Defiant Disorder

    a behavior disorder characterized by a persistent pattern of defiant, disobedient, and hostile behavior towards authority figures, manifested by a frequent loss of temper, arguing, becoming angry or vindictive, or other negativistic behaviors.

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 F91.3 to ICD-9-CMHistory

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

ICD-9-CM
313.81 Opposition defiant disor
Exact Match The mapping is direct, with no qualifiers.

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 F91.3Overview

Is F91.3 (Conduct disorders) a billable code?

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

What is the ICD-9 equivalent of F91.3?

Under the General Equivalence Mappings, oppositional defiant disorder converts to ICD-9-CM 313.81 (opposition defiant disor). The mapping is a direct match.

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.