U.S. ICD-10-CM · FY 2027

F91 ICD-10-CM Code: Conduct disorders

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

F91

Conduct disorders

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where F91 sits

  1. 1

    Chapter 5

    Mental, Behavioral and Neurodevelopmental disorders (F01-F99)

  2. 2

    Section

    Behavioral and emotional disorders with onset usually occurring in childhood and adolescence (F90-F98)

  3. 3

    Category F91

    Conduct disorders

  4. 4

    Code F91

    Conduct disorders

More specific choices

Codes under F91

F91 is a non-billable category. Choose the child code that best matches the documented diagnosis.

F91.0

Conduct disorder confined to family context

F91.1

Conduct disorder, childhood-onset type

F91.2

Conduct disorder, adolescent-onset type

F91.3

Oppositional defiant disorder

F91.8

Other conduct disorders

F91.9

Conduct disorder, unspecified

Documentation details

Notes for this code

Inclusion terms

No inclusion terms are listed for F91.

Code first

No “code first” instruction is listed for F91.

Use additional code

No “use additional code” instruction is listed for F91.

Excludes1

Conditions that should not be reported together with this code.

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

Excludes2

Conditions not included here that may be reported separately when present.

  • conduct problems associated with attention-deficit hyperactivity disorder (F90.-)
  • mood [affective] disorders (F30-F39)
  • pervasive developmental disorders (F84.-)
  • schizophrenia (F20.-)

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code F91 mean?

F91 is the FY 2027 U.S. ICD-10-CM code for “Conduct disorders.”

Is F91 a billable or specific ICD-10-CM code?

No. F91 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is F91 located in ICD-10-CM?

F91 is listed in Chapter 5, Mental, Behavioral and Neurodevelopmental disorders (F01-F99), within Behavioral and emotional disorders with onset usually occurring in childhood and adolescence (F90-F98) (F90–F98), under category F91, Conduct disorders.

What coding notes are listed for F91?

No inclusion terms are listed for F91 in this reference record. No code-first instruction is listed. Excludes1 notes: antisocial behavior (Z72.81-); antisocial personality disorder (F60.2). Excludes2 notes: conduct problems associated with attention-deficit hyperactivity disorder (F90.-); mood [affective] disorders (F30-F39); pervasive developmental disorders (F84.-); schizophrenia (F20.-).

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