F91 ICD-10-CA category: Conduct disorders
F91 isn’t a code on its own. Choose one of the 6 codes beneath it, the one the documentation supports.
Official description
F91Conduct disorders
ICD-10-CA · Canada
Codes in F91
F91 isn’t a code on its own. Open the code that matches what the note documents.
Notes for F91
As CIHI prints them, with any note F91 takes from the headings above it.
Includes
- Disorders of psychological developmentFrom Chapter 5: Mental and behavioural disorders (F00-F99)
Excludes
Conditions classified elsewhere.
- Mood [affective] (F30-F39)pervasive developmental disorders (F84.-)schizophrenia (F20.-)when associated with:• emotional disorders (F92.-)• hyperkinetic disorders (F90.1)
- Symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)From Chapter 5: Mental and behavioural disorders (F00-F99)
Note
- Disorders characterized by a repetitive and persistent pattern of dissocial, aggressive, or defiant conduct. Such behaviour should amount to major violations of age-appropriate social expectations; it should therefore be more severe than ordinary childish mischief or adolescent rebelliousness and should imply an enduring pattern of behaviour (six months or longer). Features of conduct disorder can also be symptomatic of other psychiatric conditions, in which case the underlying diagnosis should be preferred.Examples of the behaviours on which the diagnosis is based include excessive levels of fighting or bullying, cruelty to other people or animals, severe destructiveness to property, fire-setting, stealing, repeated lying, truancy from school and running away from home, unusually frequent and severe temper tantrums, and disobedience. Any one of these behaviours, if marked, is sufficient for the diagnosis, but isolated dissocial acts are not.
Where F91 sits
- 1ChapterChapter 5: Mental and behavioural disorders (F00-F99)
- 2Block F90-F98Behavioural and emotional disorders with onset usually occurring in childhood and adolescence
- 3Category F91Conduct disorders
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
Is F91 a valid ICD-10-CA code?
No. F91 (Conduct disorders) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 6 codes; record the one the documentation supports.
Where is F91 in ICD-10-CA?
F91 sits under F90-F98 Behavioural and emotional disorders with onset usually occurring in childhood and adolescence, within Chapter 5: Mental and behavioural disorders (F00-F99).
What coding notes apply to F91?
ICD-10-CA lists Note, Excludes, Includes notes for F91, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.
Codes beside F91
View F90-F98F90Hyperkinetic disordersF92Mixed disorders of conduct and emotionsF93Emotional disorders with onset specific to childhoodF94Disorders of social functioning with onset specific to childhood and adolescenceF95Tic disordersF98Other behavioural and emotional disorders with onset usually occurring in childhood and adolescence