{"h1":"ICD-11 Classification for Down Syndrome (LD40.0)","faq":[{"a":"Down syndrome is classified as LD40.0 (Trisomy 21) within the parent category LD40 Down syndrome in ICD-11-MMS, in the chapter on developmental anomalies.","q":"What is the ICD-11 code for Down syndrome?"},{"a":"Yes. LD40 encompasses the cytogenetic variants — complete trisomy 21 (the LD40.0 stem), translocation and mosaic forms — so the code should be paired with the karyotype where available.","q":"Does LD40 distinguish between types of Down syndrome?"},{"a":"ICD-11 encourages clustering. Clinicians commonly add codes for disorders of intellectual development and any cardiac, hearing, vision or thyroid involvement, since the chromosomal code alone does not convey functional status.","q":"Should other conditions be coded alongside LD40.0?"},{"a":"As soon as the infant is medically stable. Early speech, occupational and physiotherapy from infancy supports the strongest developmental trajectory, alongside routine AAP/IAP surveillance.","q":"When should early intervention begin?"}],"lang":"en","slug":"what-is-the-icd-11-classification-for-down-syndrome","title":"ICD-11 Classification for Down Syndrome (LD40.0)","entity":{"key":"down-syndrome","kind":"condition","name":"Down Syndrome","slug":null},"lenses":[{"kind":"stakeholder","label":"Doctor","value":"doctor"},{"kind":"domain","label":"Context","value":"context"},{"kind":"intent","label":"Definition","value":"definition"},{"kind":"lifecycle","label":"Screen","value":"screen"},{"kind":"route","label":"Screen","value":"screen"},{"kind":"empowerment","label":"Early Clarity","value":"early_clarity"}],"parent":{"key":"conditions","label":"Conditions"},"related":[{"lang":"en","slug":"what-is-the-icd-11-classification-for-genetic-chromosomal-syndromes","title":"What is the ICD-11 classification for Genetic / Chromosomal Syndromes?"},{"lang":"en","slug":"what-is-down-syndrome-and-what-are-its-icd-11-features-in-early-childhood","title":"What is Down Syndrome, and what are its ICD-11 features in early childhood?"},{"lang":"en","slug":"what-is-the-snomed-ct-concept-for-down-syndrome","title":"What is the SNOMED CT concept for Down Syndrome?"},{"lang":"en","slug":"what-is-down-syndrome","title":"What is Down Syndrome?"},{"lang":"en","slug":"which-icf-functioning-domains-does-down-syndrome-affect-in-early-childhood","title":"Which ICF functioning domains does Down Syndrome affect in early childhood?"},{"lang":"en","slug":"what-are-the-known-contributing-factors-for-down-syndrome-in-early-childhood","title":"Contributing Factors for Down Syndrome in Early Childhood"}],"summary":"In ICD-11-MMS, Down syndrome is coded LD40.0 (Trisomy 21) under the parent LD40 Down syndrome, in the developmental anomalies chapter. The code names the chromosomal aetiology; associated intellectual, cardiac, hearing and thyroid features are coded alongside, with care driven by functioning rather than the label.","answer_md":"*A precise code anchors every shared decision — here is exactly where Down syndrome sits in ICD-11.*\n\n## In short\nIn ICD-11-MMS, Down syndrome is classified under **LD40.0 — Trisomy 21**, within the parent category **LD40 Down syndrome** in the chapter on *Developmental anomalies* (chromosomal abnormalities, excluding gene mutations). The code captures the underlying genetic basis — three copies of chromosome 21 — rather than a developmental label. ICD-11 then expects associated functional features (intellectual development, congenital cardiac, hearing or thyroid involvement) to be coded alongside, reflecting the WHO move toward multi-parent classification and functioning-led description.\n\n## The classification, in detail\nLD40 encompasses the recognised cytogenetic variants — complete trisomy 21 (the LD40.0 stem), translocation Down syndrome and mosaic forms — so the diagnosis should be paired with the karyotype where available. ICD-11's design encourages clustering: alongside LD40.0, clinicians commonly add codes for **disorders of intellectual development** (6A00 spectrum) and any structural or endocrine comorbidity, because the chromosomal code alone does not convey functional status.\n\nFor a child, this distinction matters clinically: the code names the aetiology, but the **care plan is driven by functioning** — communication, motor, cognition, feeding, hearing and cardiac surveillance. That is where a structured developmental profile, not the ICD code, guides therapy intensity and goals.\n\n## When to act\nDown syndrome is recognised at or near birth, so the pathway is early confirmation (karyotype), routine AAP/IAP surveillance for cardiac, thyroid, hearing and vision needs, and **early intervention from infancy** — speech, occupational and physiotherapy initiated as soon as the infant is medically stable yields the strongest developmental trajectory.\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 a code or an online form. With 25 million+ therapy sessions and 700+ therapists across 70+ centres, our teams translate a confirmed Down syndrome diagnosis into a functioning-led plan spanning [speech therapy](https://www.pinnacleblooms.org/top-speech-therapy-center-india-proven-improvement-rate) and early developmental support. Begin with a [structured developmental assessment](/) to set the baseline.\n\n## Trusted sources\nWHO ICD-11 for Mortality and Morbidity Statistics (LD40 Down syndrome, LD40.0 Trisomy 21); American Academy of Pediatrics health-supervision guidance for children with Down syndrome; CDC developmental milestone resources.\n\n**Next step —** Confirm the diagnosis with your geneticist or paediatrician, then [book a Pinnacle developmental assessment](/) to start a functioning-led care plan.\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-the-icd-11-classification-for-down-syndrome","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-the-icd-11-classification-for-down-syndrome","lang":"en","indexable":true},{"href":"https://pinnacleblooms.org/ask/what-is-the-icd-11-classification-for-down-syndrome-te","lang":"te","indexable":true}],"dimensions":[{"key":"conditions","label":"Conditions"}],"meta_title":"Down Syndrome ICD-11 Code: LD40.0 Explained","meta_robots":"index, follow, max-image-preview:large","everyday_tip":"When documenting, remember the ICD code names the cause; the child's care plan is driven by their functional profile across communication, motor, cognition and feeding.","published_at":"2026-06-10T10:52:00.07543+00:00","reading_paths":[{"key":"understand","items":[{"lang":"en","slug":"what-is-down-syndrome-and-what-are-its-icd-11-features-in-early-childhood","title":"What is Down Syndrome, and what are its ICD-11 features in early childhood?","reason":"Linked from this 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