# What is Intellectual Disability, and what are its ICD-11 features in early childhood?

Canonical: https://pinnacleblooms.org/ask/what-is-intellectual-disability-and-what-are-its-icd-11-features-in-early-childhood
Publisher: Pinnacle Blooms Network / Bharath Healthcare Laboratories Private Limited

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.

*A child who learns more slowly across every domain is telling you something about adaptive functioning — not destiny.*

## In short
Intellectual 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.

## The science, briefly
Unlike 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.

## The Pinnacle way
A 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.

## Trusted sources
WHO 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).

**Next step —** Have a child with global delay in your clinic? [Refer them for a structured developmental assessment](/early-intervention).

This is general information, not a diagnosis — individual assessment and diagnosis require an appropriately qualified healthcare professional.

## Sources
- WHO ICD-11 — Disorders of intellectual development: https://icd.who.int/browse11
- CDC — Learn the Signs. Act Early.: https://www.cdc.gov/child-development
- American Academy of Pediatrics — HealthyChildren.org: https://www.healthychildren.org

## Connected topics and perspectives
- Conditions: https://pinnacleblooms.org/ask/conditions
- Doctor: https://pinnacleblooms.org/ask/lens/stakeholder/doctor
- Cognitive: https://pinnacleblooms.org/ask/lens/domain/cognitive
- Definition: https://pinnacleblooms.org/ask/lens/intent/definition
- Screen: https://pinnacleblooms.org/ask/lens/lifecycle/screen
- Special Education: https://pinnacleblooms.org/ask/lens/route/special-education
- Early Clarity: https://pinnacleblooms.org/ask/lens/empowerment/early_clarity

## Related question paths

### Understand the subject
- ICD-11 Classification for Intellectual Disability (6A00): https://pinnacleblooms.org/ask/what-is-the-icd-11-classification-for-intellectual-disability
- What is Intellectual Disability?: https://pinnacleblooms.org/ask/what-is-intellectual-disability
- ICF functioning domains affected by Intellectual Disability in early childhood: https://pinnacleblooms.org/ask/which-icf-functioning-domains-does-intellectual-disability-affect-in-early-childhood
- What is the SNOMED CT concept for Intellectual Disability?: https://pinnacleblooms.org/ask/what-is-the-snomed-ct-concept-for-intellectual-disability
- How Intellectual Disability affects a child's daily life: https://pinnacleblooms.org/ask/how-does-intellectual-disability-affect-a-child-s-daily-life
- Is Intellectual Disability considered a disability?: https://pinnacleblooms.org/ask/is-intellectual-disability-considered-a-disability
- Is Intellectual Disability Genetic or Hereditary?: https://pinnacleblooms.org/ask/is-intellectual-disability-genetic-or-hereditary
- What are common myths about Intellectual Disability?: https://pinnacleblooms.org/ask/what-are-common-myths-about-intellectual-disability
- Levels of Intellectual Disability: https://pinnacleblooms.org/ask/what-are-the-types-or-levels-of-intellectual-disability
- What causes Intellectual Disability in children?: https://pinnacleblooms.org/ask/what-causes-intellectual-disability-in-children
- Early Intervention Outcomes for Intellectual Disability in Children Under 7: https://pinnacleblooms.org/ask/what-does-current-research-show-about-early-intervention-outcomes-for-intellectual-disability-in-children-under-7
- What other conditions often occur alongside Intellectual Disability?: https://pinnacleblooms.org/ask/what-other-conditions-often-occur-alongside-intellectual-disability

### Recognise signs & concerns
- Clinical red flags for Intellectual Disability referral: https://pinnacleblooms.org/ask/what-clinical-red-flags-for-intellectual-disability-warrant-referral-in-a-young-child
- Early indicators of Intellectual Disability for paediatricians: https://pinnacleblooms.org/ask/what-early-indicators-of-intellectual-disability-should-a-paediatrician-watch-for
- When to refer suspected Intellectual Disability for developmental therapy: https://pinnacleblooms.org/ask/when-should-a-doctor-refer-a-child-with-suspected-intellectual-disability-for-developmental-therapy
- Can Intellectual Disability Be Cured?: https://pinnacleblooms.org/ask/can-intellectual-disability-be-cured
- Can Intellectual Disability Be Prevented?: https://pinnacleblooms.org/ask/can-intellectual-disability-be-prevented
- Do boys show Intellectual Disability differently?: https://pinnacleblooms.org/ask/do-boys-show-intellectual-disability-differently
- Do girls show Intellectual Disability differently?: https://pinnacleblooms.org/ask/do-girls-show-intellectual-disability-differently
- How a frontline health worker can spot possible Intellectual Disability early: https://pinnacleblooms.org/ask/how-can-a-frontline-health-worker-spot-a-child-with-possible-intellectual-disability-early
- What are the early signs of Intellectual Disability?: https://pinnacleblooms.org/ask/what-are-the-early-signs-of-intellectual-disability
- Early Signs of Intellectual Disability in a 1-Year-Old Boy: https://pinnacleblooms.org/ask/what-are-the-early-signs-of-intellectual-disability-in-a-1-year-old-boy
- What are the early signs of Intellectual Disability in a 1-year-old girl?: https://pinnacleblooms.org/ask/what-are-the-early-signs-of-intellectual-disability-in-a-1-year-old-girl
- Early Signs of Intellectual Disability in a 12-to-18-Month-Old: https://pinnacleblooms.org/ask/what-are-the-early-signs-of-intellectual-disability-in-a-12-to-18-month-old

### Explore causes & influences
- How Intellectual Disability Affects Cognitive Development: https://pinnacleblooms.org/ask/how-does-intellectual-disability-affect-a-child-s-cognitive-development
- Contributing Factors for Intellectual Disability: https://pinnacleblooms.org/ask/what-are-the-known-contributing-factors-for-intellectual-disability-in-early-childhood
- Are boys more likely to have intellectual disability?: https://pinnacleblooms.org/ask/are-boys-more-likely-to-have-intellectual-disability
- Are girls more likely to have Intellectual Disability?: https://pinnacleblooms.org/ask/are-girls-more-likely-to-have-intellectual-disability
- Early Intervention for Intellectual Disability and the UNCRPD/SDGs: https://pinnacleblooms.org/ask/how-does-early-intervention-for-intellectual-disability-advance-un-child-rights-uncrpd-and-the-sdgs
- What causes Intellectual Disability in young children?: https://pinnacleblooms.org/ask/what-causes-intellectual-disability-in-young-children
- Cost-Effectiveness of Early Therapy for Intellectual Disability: https://pinnacleblooms.org/ask/what-is-the-cost-effectiveness-of-early-therapy-for-intellectual-disability-in-young-children
- Intellectual Disability in India: prevalence and public-health burden: https://pinnacleblooms.org/ask/what-is-the-prevalence-and-public-health-burden-of-intellectual-disability-among-young-children-in-india

### Understand assessment
- How Intellectual Disability Is Assessed in a Young Child: https://pinnacleblooms.org/ask/how-is-intellectual-disability-assessed-in-a-young-child
- Screening and Diagnostic Pathway for Intellectual Disability in Children Under 7: https://pinnacleblooms.org/ask/what-is-the-recommended-screening-and-diagnostic-pathway-for-intellectual-disability-in-children-under-7
- How AbilityScore® Tracks Progress in Intellectual Disability: https://pinnacleblooms.org/ask/how-does-abilityscore-track-progress-in-a-child-with-intellectual-disability
- What an AbilityScore of 0–100 Means for Intellectual Disability: https://pinnacleblooms.org/ask/what-does-an-abilityscore-of-0-100-mean-for-a-child-with-intellectual-disability
- What does an AbilityScore of 100–200 mean for a child with Intellectual Disability?: https://pinnacleblooms.org/ask/what-does-an-abilityscore-of-100-200-mean-for-a-child-with-intellectual-disability
- What an AbilityScore of 200–300 Means in Intellectual Disability: https://pinnacleblooms.org/ask/what-does-an-abilityscore-of-200-300-mean-for-a-child-with-intellectual-disability
- What an AbilityScore of 300-400 Means for a Child with Intellectual Disability: https://pinnacleblooms.org/ask/what-does-an-abilityscore-of-300-400-mean-for-a-child-with-intellectual-disability
- What an AbilityScore of 400–500 Means in Intellectual Disability: https://pinnacleblooms.org/ask/what-does-an-abilityscore-of-400-500-mean-for-a-child-with-intellectual-disability
- What an AbilityScore of 500–600 Means in Intellectual Disability: https://pinnacleblooms.org/ask/what-does-an-abilityscore-of-500-600-mean-for-a-child-with-intellectual-disability
- What an AbilityScore of 600–700 Means in Intellectual Disability: https://pinnacleblooms.org/ask/what-does-an-abilityscore-of-600-700-mean-for-a-child-with-intellectual-disability
- AbilityScore 700–800 in Intellectual Disability: https://pinnacleblooms.org/ask/what-does-an-abilityscore-of-700-800-mean-for-a-child-with-intellectual-disability
- What does an AbilityScore of 800–900 mean for a child with Intellectual Disability?: https://pinnacleblooms.org/ask/what-does-an-abilityscore-of-800-900-mean-for-a-child-with-intellectual-disability

### Explore therapy & support
- How is Intellectual Disability diagnosed in a child?: https://pinnacleblooms.org/ask/how-is-intellectual-disability-diagnosed-in-a-child
- How Grandparents and Caregivers Can Support a Child with Intellectual Disability: https://pinnacleblooms.org/ask/as-a-grandparent-or-caregiver-how-can-i-support-a-child-with-intellectual-disability-day-to-day
- Can a child with Intellectual Disability attend mainstream school?: https://pinnacleblooms.org/ask/can-a-child-with-intellectual-disability-attend-a-mainstream-school
- Can a child with Intellectual Disability attend a regular school?: https://pinnacleblooms.org/ask/can-a-child-with-intellectual-disability-attend-a-regular-school
- Can a Child with Intellectual Disability Live Independently?: https://pinnacleblooms.org/ask/can-a-child-with-intellectual-disability-grow-up-to-live-independently
- How can a classroom teacher help a child with Intellectual Disability take part and learn?: https://pinnacleblooms.org/ask/how-can-a-classroom-teacher-help-a-child-with-intellectual-disability-take-part-and-learn
- Early intervention for Intellectual Disability in under-7s: https://pinnacleblooms.org/ask/how-can-a-district-early-intervention-programme-identify-and-support-children-under-7-with-intellectual-disability
- How a teacher can include a child with intellectual disability in a mainstream classroom: https://pinnacleblooms.org/ask/how-can-a-teacher-include-and-support-a-young-child-with-intellectual-disability-in-a-mainstream-classroom
- Supporting Cognitive Development in Intellectual Disability: https://pinnacleblooms.org/ask/how-can-we-support-cognitive-development-in-a-child-with-intellectual-disability
- How therapy helps a child with intellectual disability progress: https://pinnacleblooms.org/ask/how-does-therapy-help-a-child-with-intellectual-disability-make-progress
- How Intellectual Disability Is Supported Through Therapy: https://pinnacleblooms.org/ask/how-is-intellectual-disability-supported-through-therapy
- My child with Intellectual Disability has an AbilityScore — what next?: https://pinnacleblooms.org/ask/my-child-with-intellectual-disability-has-an-abilityscore-of-0-100-what-should-we-do-next