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ICD-11 Classification of Dyscalculia (6A03.2)
In ICD-11-MMS, Dyscalculia is coded 6A03.2 — Developmental learning disorder with impairment in mathematics — under the parent category 6A03 within neurodevelopmental disorders. It denotes persistent, significant difficulty acquiring mathematical skills not explained by intellectual disability, sensory or neurological impairment, or inadequate schooling.
In this answer 5 sections
A child who struggles to grasp number sense or master arithmetic isn't lazy or inattentive — they may be presenting with a specific, recognised learning difference.
In short
In ICD-11-MMS, Dyscalculia is classified as 6A03.2 — Developmental learning disorder with impairment in mathematics, sitting under the parent category 6A03 Developmental learning disorder within neurodevelopmental disorders. It denotes significant and persistent difficulties acquiring mathematical skills — number sense, memorisation of arithmetic facts, accurate calculation and fluent reasoning — that fall substantially below expectation for chronological age and are not better accounted for by intellectual disability, sensory impairment, neurological disorder, inadequate schooling or lack of access to instruction.
The clinical picture
The 6A03.2 specifier applies when mathematical attainment is markedly below the level expected, persists despite appropriate intervention, and materially affects academic, occupational or daily functioning. Onset is during the developmental period, though impairment may only become evident once mathematical demands exceed the individual's capacity. Common presentations include:
- Poor sense of number magnitude and difficulty with subitising or estimation
- Persistent reliance on counting strategies and weak retrieval of arithmetic facts
- Errors in calculation procedures and multi-step mathematical reasoning
- Difficulty with the mathematical and quantitative aspects of everyday tasks
Dyscalculia frequently co-occurs with developmental learning disorder with impairment in reading (6A03.0) and with ADHD, so a structured, multi-domain profile is preferable to a single-skill snapshot.
When to refer
Consider formal assessment when mathematical difficulties are disproportionate to overall ability, persist across at least several months of targeted support, and cannot be explained by schooling gaps or another condition. Differentiate from acquired acalculia (neurological) and from global delay before assigning the developmental specifier.
The Pinnacle way
A clinical AbilityScore® and any formal diagnosis are established only at a Pinnacle Blooms Network centre, under qualified clinician care — never from an online form. Our structured, clinician-administered assessment profiles cognition and learning alongside communication and attention, so a mathematics impairment is read in context rather than isolation. Explore our approach to learning and developmental support, special education and learning therapy, and how the AbilityScore is formed.
Trusted sources
WHO ICD-11 for Mortality and Morbidity Statistics, category 6A03 Developmental learning disorder; WHO ICF framework of functioning.
Next step — For a child showing persistent maths difficulties, arrange a structured developmental assessment with a Pinnacle clinician.
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
Mathematical attainment markedly below age expectation, persistent reliance on counting, weak arithmetic-fact retrieval, and difficulty with quantitative everyday tasks that persist despite targeted support.
In everyday life
When a child avoids or finds maths disproportionately hard relative to other skills, note whether the gap persists across settings and over time — pattern and persistence matter more than a single bad test.
Bring your observations and questions to your child’s professional. Choose activities that suit your child’s comfort, abilities and agreed plan.
Bring your questions to a first visitQuestions families ask
What is the ICD-11 code for Dyscalculia?
Dyscalculia is classified under ICD-11-MMS as 6A03.2 — Developmental learning disorder with impairment in mathematics, within the 6A03 developmental learning disorder category of neurodevelopmental disorders.
How does ICD-11 distinguish Dyscalculia from a general learning delay?
The 6A03.2 specifier requires that mathematical attainment is substantially below expectation for chronological age and not better explained by intellectual disability, sensory or neurological impairment, or inadequate instruction — making it a specific rather than global difficulty.
Can Dyscalculia co-occur with other learning disorders?
Yes. It frequently co-occurs with developmental learning disorder with impairment in reading (6A03.0) and with ADHD, which is why a multi-domain clinician-administered profile is recommended over a single-skill assessment.
FOLLOW THE SOURCE
References behind this answer.
- Organisation website · further readingWHO ICD-11 — Developmental learning disorder (6A03)
- Source referenceWHO ICF framework of functioning
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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