{"h1":"Intellectual Disability: ICD-11 6A00 in early childhood","faq":[{"a":"ICD-11 (6A00) requires assessment of both intellectual functioning and adaptive behaviour using standardised instruments where possible, grades severity as mild to profound, and adds provisional and global-developmental-delay categories for when testing is unreliable, such as in young children.","q":"How does ICD-11 differ from earlier classifications of intellectual disability?"},{"a":"A firm severity-graded diagnosis is difficult before about age 4 because IQ testing is unreliable. ICD-11 instead uses global developmental delay (6A00.4) as a working construct, with re-assessment over time as the child develops.","q":"Can intellectual disability be diagnosed in a toddler?"},{"a":"Global developmental delay describes significant delay across multiple domains in a young child where severity cannot yet be reliably specified; intellectual disability is the diagnosis applied once functioning can be reliably measured against peers.","q":"What is the difference between intellectual disability and global developmental delay?"}],"lang":"en","slug":"what-is-intellectual-disability-and-what-are-its-icd-11-features-in-early-childhood","title":"What is Intellectual Disability, and what are its ICD-11 features in early childhood?","entity":{"key":"id","kind":"condition","name":"Intellectual Disability","slug":"intellectual-disability"},"lenses":[{"kind":"stakeholder","label":"Doctor","value":"doctor"},{"kind":"domain","label":"Cognitive","value":"cognitive"},{"kind":"intent","label":"Definition","value":"definition"},{"kind":"lifecycle","label":"Screen","value":"screen"},{"kind":"route","label":"Special-Education","value":"special-education"},{"kind":"empowerment","label":"Early Clarity","value":"early_clarity"}],"parent":{"key":"conditions","label":"Conditions"},"related":[{"lang":"en","slug":"which-icf-functioning-domains-does-intellectual-disability-affect-in-early-childhood","title":"ICF functioning domains affected by Intellectual Disability in early childhood"},{"lang":"en","slug":"how-does-intellectual-disability-affect-a-child-s-cognitive-development","title":"How Intellectual Disability Affects Cognitive Development"},{"lang":"en","slug":"how-is-intellectual-disability-assessed-in-a-young-child","title":"How Intellectual Disability Is Assessed in a Young Child"},{"lang":"en","slug":"what-is-the-icd-11-classification-for-intellectual-disability","title":"ICD-11 Classification for Intellectual Disability (6A00)"},{"lang":"en","slug":"what-is-intellectual-disability","title":"What is Intellectual Disability?"},{"lang":"en","slug":"how-is-intellectual-disability-diagnosed-in-a-child","title":"How is Intellectual Disability diagnosed in a child?"}],"summary":"Intellectual Disability (ICD-11 6A00, Disorders of intellectual development) is a developmental-period condition marked by significant limitations in both intellectual functioning and adaptive behaviour. In early childhood, where IQ testing is unreliable, it often presents as global developmental delay (6A00.4) across motor, language, cognitive and social domains, graded by severity once measurable.","answer_md":"*A child who learns more slowly across every domain is telling you something about adaptive functioning — not destiny.*\n\n## In short\nIntellectual Disability — termed **Disorders of intellectual development (ICD-11 6A00)** — is a group of conditions originating during the developmental period, characterised by significant limitations in **intellectual functioning** (reasoning, problem-solving, learning) and **adaptive behaviour** (conceptual, social and practical skills) relative to age- and culture-matched peers. ICD-11 grades severity as mild, moderate, severe or profound, and adds a *provisional* category where standardised testing is invalid or unavailable.\n\n## The science, briefly\nUnlike its predecessor, ICD-11 deliberately requires assessment of **both** cognition and adaptive functioning, ideally via standardised, individually administered, norm-referenced instruments. In **early childhood**, formal IQ measures are less reliable, so the diagnosis often rests on a marked, global developmental delay across multiple domains. ICD-11 therefore offers the parallel construct **6A00.4 — global developmental delay** for children under ~4 years where severity cannot yet be reliably specified. Look for delayed milestones across motor, language, cognitive and social-adaptive lines that persist over time and across settings — distinct from an isolated speech or motor delay. Co-occurring sensory, motor and genetic aetiologies are common and warrant a structured developmental and aetiological work-up.\n\n## The Pinnacle way\nA clinical [AbilityScore®](/ask/what-is-the-abilityscore-and-how-is-it-calculated) and any diagnosis are formed only at a Pinnacle Blooms Network centre, under qualified clinician care — never from an app or form. From a baseline, we map a domain-by-domain plan spanning [early-intervention therapy](/early-intervention) and [intellectual-disability support](/intellectual-disability) toward functional independence.\n\n## Trusted sources\nWHO ICD-11 6A00 (Disorders of intellectual development); CDC *Learn the Signs. Act Early.* developmental milestones; Indian Academy of Pediatrics; American Academy of Pediatrics (HealthyChildren.org).\n\n**Next step —** Have a child with global delay in your clinic? [Refer them for a structured developmental assessment](/early-intervention).\n\nThis is general information, not a diagnosis — individual assessment and diagnosis require an appropriately qualified healthcare professional.","canonical":"https://pinnacleblooms.org/ask/what-is-intellectual-disability-and-what-are-its-icd-11-features-in-early-childhood","editorial":{"reviewed_at":"2026-06-11T20:12:18.613642+00:00","reviewed_by":null,"developed_by":"SETU Consortium · Pinnacle Blooms Network"},"alternates":[{"href":"https://pinnacleblooms.org/ask/what-is-intellectual-disability-and-what-are-its-icd-11-features-in-early-childhood","lang":"en","indexable":true},{"href":"https://pinnacleblooms.org/ask/what-is-intellectual-disability-and-what-are-its-icd-11-features-in-early-childhood-te","lang":"te","indexable":true}],"dimensions":[{"key":"conditions","label":"Conditions"}],"meta_title":"Intellectual Disability (ICD-11 6A00) Explained","meta_robots":"index, follow, max-image-preview:large","everyday_tip":"In under-4s, document adaptive function across domains and re-review rather than rushing a fixed severity label; use global developmental delay as the working construct.","published_at":"2026-06-10T10:42:00.172548+00:00","reading_paths":[{"key":"understand","items":[{"lang":"en","slug":"what-is-the-icd-11-classification-for-intellectual-disability","title":"ICD-11 Classification for Intellectual Disability (6A00)","reason":"Linked from this answer"},{"lang":"en","slug":"what-is-intellectual-disability","title":"What is Intellectual Disability?","reason":"Linked from this answer"},{"lang":"en","slug":"which-icf-functioning-domains-does-intellectual-disability-affect-in-early-childhood","title":"ICF functioning domains affected by Intellectual Disability in early childhood","reason":"Linked from this answer"},{"lang":"en","slug":"what-is-the-snomed-ct-concept-for-intellectual-disability","title":"What is the SNOMED CT concept for Intellectual 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Disability early","reason":"Same topic"},{"lang":"en","slug":"what-are-the-early-signs-of-intellectual-disability","title":"What are the early signs of Intellectual Disability?","reason":"Same topic"},{"lang":"en","slug":"what-are-the-early-signs-of-intellectual-disability-in-a-1-year-old-boy","title":"Early Signs of Intellectual Disability in a 1-Year-Old Boy","reason":"Same topic"},{"lang":"en","slug":"what-are-the-early-signs-of-intellectual-disability-in-a-1-year-old-girl","title":"What are the early signs of Intellectual Disability in a 1-year-old girl?","reason":"Same topic"},{"lang":"en","slug":"what-are-the-early-signs-of-intellectual-disability-in-a-12-to-18-month-old","title":"Early Signs of Intellectual Disability in a 12-to-18-Month-Old","reason":"Same topic"}],"label":"Recognise signs & concerns","total":44},{"key":"causes","items":[{"lang":"en","slug":"how-does-intellectual-disability-affect-a-child-s-cognitive-development","title":"How Intellectual Disability Affects Cognitive Development","reason":"Linked from this answer"},{"lang":"en","slug":"what-are-the-known-contributing-factors-for-intellectual-disability-in-early-childhood","title":"Contributing Factors for Intellectual Disability","reason":"Same topic"},{"lang":"en","slug":"are-boys-more-likely-to-have-intellectual-disability","title":"Are boys more likely to have intellectual disability?","reason":"Same topic"},{"lang":"en","slug":"are-girls-more-likely-to-have-intellectual-disability","title":"Are girls more likely to have Intellectual Disability?","reason":"Same topic"},{"lang":"en","slug":"how-does-early-intervention-for-intellectual-disability-advance-un-child-rights-uncrpd-and-the-sdgs","title":"Early Intervention for Intellectual Disability and the UNCRPD/SDGs","reason":"Same topic"},{"lang":"en","slug":"what-causes-intellectual-disability-in-young-children","title":"What causes Intellectual Disability in young children?","reason":"Same 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Intellectual Disability","reason":"Same topic"},{"lang":"en","slug":"what-does-an-abilityscore-of-400-500-mean-for-a-child-with-intellectual-disability","title":"What an AbilityScore of 400–500 Means in Intellectual Disability","reason":"Same topic"},{"lang":"en","slug":"what-does-an-abilityscore-of-500-600-mean-for-a-child-with-intellectual-disability","title":"What an AbilityScore of 500–600 Means in Intellectual Disability","reason":"Same topic"},{"lang":"en","slug":"what-does-an-abilityscore-of-600-700-mean-for-a-child-with-intellectual-disability","title":"What an AbilityScore of 600–700 Means in Intellectual Disability","reason":"Same topic"},{"lang":"en","slug":"what-does-an-abilityscore-of-700-800-mean-for-a-child-with-intellectual-disability","title":"AbilityScore 700–800 in Intellectual Disability","reason":"Same topic"},{"lang":"en","slug":"what-does-an-abilityscore-of-800-900-mean-for-a-child-with-intellectual-disability","title":"What does an AbilityScore of 800–900 mean for a child with Intellectual Disability?","reason":"Same topic"}],"label":"Understand assessment","total":15},{"key":"therapy","items":[{"lang":"en","slug":"how-is-intellectual-disability-diagnosed-in-a-child","title":"How is Intellectual Disability diagnosed in a child?","reason":"Linked from this answer"},{"lang":"en","slug":"as-a-grandparent-or-caregiver-how-can-i-support-a-child-with-intellectual-disability-day-to-day","title":"How Grandparents and Caregivers Can Support a Child with Intellectual Disability","reason":"Same topic"},{"lang":"en","slug":"can-a-child-with-intellectual-disability-attend-a-mainstream-school","title":"Can a child with Intellectual Disability attend mainstream school?","reason":"Same topic"},{"lang":"en","slug":"can-a-child-with-intellectual-disability-attend-a-regular-school","title":"Can a child with Intellectual Disability attend a regular school?","reason":"Same 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settings and over time.","authority_links":[{"url":"https://icd.who.int/browse11","code":"6A00","label":"WHO ICD-11 — Disorders of intellectual development"},{"url":"https://www.cdc.gov/child-development","label":"CDC — Learn the Signs. Act Early."},{"url":"https://www.healthychildren.org","label":"American Academy of Pediatrics — HealthyChildren.org"}],"last_reviewed_at":"2026-06-10T10:42:00.172548+00:00","meta_description":"What Intellectual Disability means under ICD-11 6A00 — limitations in intellectual functioning and adaptive behaviour, and how it presents in early childho","related_materials":[],"related_techniques":[]}