F91.9 ICD-10-CA code: Conduct disorder, unspecified
F91.9 is the ICD-10-CA code for “Conduct disorder, unspecified” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
F91.9Conduct disorder, unspecified
Short description: Conduct disorder unspecified
ICD-10-CA · Canada · Also written F919
Index terms
Entries in CIHI’s alphabetical index that lead to F91.9. Searching the index by the condition the note names is how coders reach this code.
- Disturbance, conduct
- Disturbance, conduct, disruptive
- Disorder (of), conduct (childhood)
Notes for F91.9
As CIHI prints them, with any note F91.9 takes from the headings above it.
Includes
- Childhood:• behavioural disorder NOS• conduct disorder NOS
- 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)From F91 Conduct disorders
- 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.From F91 Conduct disorders
Where F91.9 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
- 4Valid code F91.9Conduct disorder, unspecified
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
What does ICD-10-CA code F91.9 mean?
F91.9 is the ICD-10-CA code for “Conduct disorder, unspecified” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is F91.9 in ICD-10-CA?
F91.9 sits under F91 Conduct disorders, within 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 F91.9?
ICD-10-CA lists Includes, Note, Excludes notes for F91.9, 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.