DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

F91 Conduct disorders

  • Header · not billable

F91 is not billable. The category heads 6 billable codes in FY2027: the 6 codes directly below it.

Index → code

  • Tantrum, child problem → F91.8
  • Untruthfulness, child problem → F91.8
  • Delinquency (juvenile) (neurotic) → F91.8

Where it sits

  1. Chapter 5 Mental, Behavioral and Neurodevelopmental disorders (F01-F99)
  2. F90-F98 Behavioral and emotional disorders with onset usually occurring in childhood and adolescence (F90-F98)
  3. F91 Conduct disorders
Billable codes
6
Subdivisions
6
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
27

Codes in F91

  1. F91.0
    Conduct disorder confined to family context
    Billable
  2. F91.1
    Conduct disorder, childhood-onset type
    Billable
    Inclusion terms 3

    Inclusion terms

    • Unsocialized conduct disorder
    • Conduct disorder, solitary aggressive type
    • Unsocialized aggressive disorder
  3. F91.2
    Conduct disorder, adolescent-onset type
    Billable
    Inclusion terms 2

    Inclusion terms

    • Socialized conduct disorder
    • Conduct disorder, group type
  4. F91.3
    Oppositional defiant disorder
    Billable
  5. F91.8
    Other conduct disorders
    Billable
    Inclusion terms 2

    Inclusion terms

    • Other specified conduct disorder
    • Other specified disruptive disorder
  6. F91.9
    Conduct disorder, unspecified
    Billable
    Inclusion terms 4

    Inclusion terms

    • Behavioral disorder NOS
    • Conduct disorder NOS
    • Disruptive behavior disorder NOS
    • Disruptive disorder NOS

Sources of each column.

Instructions

At F91

Excludes1

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

Excludes2

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

Notes that also apply

Block F90-F98 instructions (Notes 1): printed on the block page.

Chapter 5 instructions (Includes 1, Excludes2 1): printed on the chapter 5 page.

Index entries

  • Delinquency (juvenile) (neurotic) → F91.8
  • Tantrum, child problem → F91.8
  • Untruthfulness, child problem → F91.8
  • Disorder (of)aggressive, unsocialized → F91.1
  • Disorder (of)unsocialized aggressive → F91.1
  • Disorder (of)defiant oppositional → F91.3
  • Disorder (of)oppositional defiant → F91.3
  • Stealingchild problem → F91.8
  • Disorder (of)conduct (childhood) → F91.9
  • Disorder (of)disruptive → F91.9
  • Disturbance(s)conduct → F91.9
  • Disorder (of)conduct (childhood)confined to family context → F91.0
  • Disorder (of)conduct (childhood)childhood onset type → F91.1
  • Disorder (of)conduct (childhood)solitary aggressive type → F91.1
  • Disorder (of)conduct (childhood)unsocialized (aggressive) → F91.1
  • Disturbance(s)conductunsocialized → F91.1
  • Disorder (of)conduct (childhood)adolescent onset type → F91.2
  • Disorder (of)conduct (childhood)group type → F91.2
  • Disorder (of)conduct (childhood)socialized → F91.2
  • Disturbance(s)conductsocialized → F91.2
  • Disorder (of)conduct (childhood)oppositional defiance → F91.3
  • Disorder (of)conduct (childhood)depressive → F91.8
  • Disorder (of)conduct (childhood)specified NEC → F91.8
  • Disorder (of)disruptivespecified NEC → F91.8
  • Disturbance(s)conductspecified NEC → F91.8
  • Disturbance(s)conductdisruptive → F91.9
  • Disturbance(s)emotions specific to childhood and adolescencewithoppositional disorder → F91.3

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy