2027 ICD-10-CM Diagnosis Code F91Conduct disorders

ICD-10-CM Codes›F01–F99›F90-F98›F91

ICD-10-CM F91
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

F91 is a non-billable ICD-10-CM category code for conduct disorders, so it cannot be submitted on claims. Use a more specific code from this category instead, such as F91.0, F91.1, F91.2, and F91.3.

Code Identity

ICD-10-CM Code
F91
Billable Status
No — Non-Billable Category
Code Describes
Conduct disorders
Short Description
Conduct disorders
Same as the full description in the CMS dataset.
Chapter
F90-F98
Behavioral and emotional disorders with onset usually occurring in childhood and adolescence

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF90-F98Behavioral and emotional disorders with onset usually occurring in childhood and adolescence
CategoryF91Conduct disorders
This CodeF91Conduct disorders

Specific Coding for Conduct disordersOverview

Non-specific codes like F91 require more characters. Use one of these billable codes instead:

  • Use F91.0 for Conduct disorder confined to family context

  • Use F91.1 for Conduct disorder, childhood-onset type

  • Use F91.2 for Conduct disorder, adolescent-onset type

  • Use F91.3 for Oppositional defiant disorder

  • Use F91.8 for Other conduct disorders

  • Use F91.9 for Conduct disorder, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to F91: its own notes plus those printed at block F90-F98 and Chapter 5. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 5 (F01-F99) Mental and behavioural disorders applies to 872 codes
  • disorders of psychological development

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

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

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

On F91 itself
  • conduct problems associated with attention-deficit hyperactivity disorder (F90.-)
  • mood [affective] disorders (F30-F39)
  • pervasive developmental disorders (F84.-)
  • schizophrenia (F20.-)
From Chapter 5 (F01-F99) Mental and behavioural disorders applies to 872 codes
  • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)

Notes

General instructions on how these codes are used.

From Block F90-F98 Behavioral and emotional disorders with onset usually occurring in childhood and adolescence applies to 33 codes
  • Codes within categories F90-F98 may be used regardless of the age of a patient. These disorders generally have onset within the childhood or adolescent years, but may continue throughout life or not be diagnosed until adulthood

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name F91, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming F91: they are not reported together with it, unless the two conditions are unrelated.

  • F60.2 Antisocial personality disorder
    conduct disorders (F91.-)
  • Z72.81 Antisocial behavior
    conduct disorders (F91.-)

Excludes2 1

These codes carry an Excludes2 note naming F91: its condition is not part of those codes, and both may be reported when the patient has both.

Notes 1

These notes mention F91.

  • Block F90-F98 Behavioral and emotional disorders with onset usually occurring in childhood and adolescence
    Codes within categories F90-F98 may be used regardless of the age of a patient. These disorders generally have onset within the childhood or adolescent years, but may continue throughout life or not be diagnosed until adulthood names F90-F98, which includes this code

Clinical InformationClinical

  • 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)

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.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About F91Overview

What is the ICD-10 code for conduct disorders?

F91 is the ICD-10-CM category for conduct disorders, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is F91 (Conduct disorders) a billable code?

No. This is a category header that groups the codes for conduct disorders, and headers cannot be submitted on claims. Claims for conduct disorders need a more specific code from this category, such as F91.0, F91.1, and F91.2.

Can F91 be reported with a code from Z72.81?

Not as a rule. The Excludes1 note on F91 lists "antisocial behavior (Z72.81-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).