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ICD-11 Classification of Conduct-Dissocial Disorder (6C91)
ICD-11 (MMS) classifies Conduct-Dissocial Disorder as 6C91, within the grouping 6C9 Disruptive behaviour or dissocial disorders, under Mental, behavioural or neurodevelopmental disorders. It denotes a persistent pattern violating others' rights or major societal norms, with onset, course and limited-prosocial-emotions qualifiers.
In this answer 5 sections
Behind a referral for persistent rule-breaking and aggression sits a precise ICD-11 grouping — knowing exactly where 6C91 sits sharpens both formulation and care planning.
In short
In ICD-11 (MMS), Conduct-Dissocial Disorder is coded 6C91, situated within the grouping Disruptive behaviour or dissocial disorders (6C9), under the broader chapter of Mental, behavioural or neurodevelopmental disorders. It is defined by a repetitive, persistent pattern of behaviour that violates the basic rights of others or major age-appropriate societal norms, rules or laws — clearly beyond ordinary childhood mischief and sustained over time.
The classification in detail
Within the 6C9 grouping, ICD-11 distinguishes 6C90 Oppositional defiant disorder from 6C91 Conduct-dissocial disorder. The 6C91 pattern includes aggression toward people or animals, destruction of property, deceitfulness or theft, and serious violations of rules, typically enduring 12 months or more.
ICD-11 replaces the older ICD-10 childhood/adolescent-onset split with onset and course qualifiers and a clinically important specifier of limited prosocial emotions (callous-unemotional traits) — lack of remorse, shallow affect, unconcern about performance — which carries prognostic weight. Subtype and age-of-onset qualifiers (childhood vs adolescent onset) further refine the formulation. Differential consideration should exclude oppositional defiant disorder, ADHD-driven impulsivity, mood or trauma-related presentations, and autism-spectrum behavioural patterns before the 6C91 code is applied.
When to refer
Refer for structured assessment when aggressive, deceitful or rule-violating behaviour is pervasive across settings, persistent over months, and disproportionate to developmental stage — particularly with co-occurring ADHD, learning difficulties, or adverse childhood experiences, where early multimodal intervention measurably improves trajectory.
The Pinnacle way
AbilityScore® is part of Pinnacle’s developmental assessment. Diagnosis, where needed, requires an appropriately qualified healthcare professional — never from a code lookup or an online form. Our teams use a clinician-administered structured assessment to map functioning across communication, cognition, social and emotional-regulation domains before any classification is confirmed. Explore how the AbilityScore® is established, our behavioural and developmental therapy pathways, and the Pinnacle network.
Trusted sources
WHO ICD-11 for Mortality and Morbidity Statistics, grouping 6C9 Disruptive behaviour or dissocial disorders (icd.who.int); WHO clinical descriptions and diagnostic requirements for mental, behavioural and neurodevelopmental disorders.
Next step — Reviewing a child with disruptive-behaviour concerns? Refer to a Pinnacle clinician for structured assessment.
This is general information, not a diagnosis — individual assessment and diagnosis require an appropriately qualified healthcare professional.
CONNECT THE ANSWER TO YOUR CHILD’S DAY
Something to notice. Something to discuss.
What to notice
Pervasive, persistent (12+ months) aggression, destructiveness, deceit or rule violation across settings, beyond developmental norms; note limited prosocial emotions (callous-unemotional traits) as a prognostic specifier.
In everyday life
When documenting, capture onset (childhood vs adolescent), pervasiveness across settings, duration, and any limited-prosocial-emotions features — these qualifiers materially shape the ICD-11 formulation and care plan.
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Bring your questions to a first visitQuestions families ask
What is the ICD-11 code for Conduct-Dissocial Disorder?
It is 6C91 in the ICD-11 Mortality and Morbidity Statistics (MMS), within the grouping 6C9 Disruptive behaviour or dissocial disorders, under Mental, behavioural or neurodevelopmental disorders.
How does ICD-11 distinguish Conduct-Dissocial Disorder from Oppositional Defiant Disorder?
Both sit within grouping 6C9, but Oppositional defiant disorder (6C90) centres on persistent defiance, irritability and argumentativeness, whereas Conduct-dissocial disorder (6C91) involves a repetitive pattern that violates others' basic rights or major societal norms — aggression, destruction, deceit or serious rule violation.
What qualifiers does ICD-11 add to 6C91?
ICD-11 uses onset qualifiers (childhood vs adolescent onset), course descriptors, and a specifier of limited prosocial emotions (callous-unemotional traits), which carries prognostic significance and informs intervention planning.
Is a diagnosis of Conduct-Dissocial Disorder made from the ICD-11 code alone?
No. The code supports classification, but diagnosis requires a qualified clinician's structured assessment. At Pinnacle Blooms Network, any clinical AbilityScore® and diagnosis are formed only at a centre under clinician care.
FOLLOW THE SOURCE
References behind this answer.
- Organisation website · further readingWHO ICD-11 MMS — Disruptive behaviour or dissocial disorders (6C9)
- Organisation website · further readingWHO — Mental, behavioural and neurodevelopmental disorders
References are supplied with this answer. An organisation homepage offers further reading; it does not establish an independent review of this page.
Content attribution: SETU Consortium · Pinnacle Blooms Network.
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