{"h1":"ICD-11 Classification of Hypotonia (Low Muscle Tone)","faq":[{"a":"ICD-11 classifies hypotonia as a clinical sign or manifestation (MB47.4), not an aetiological diagnosis. The underlying cause — neuromuscular, central, genetic, metabolic or syndromic — must always be identified and coded separately.","q":"Is hypotonia a diagnosis or a sign in ICD-11?"},{"a":"Add the relevant aetiological ICD-11 code — for example a neuromuscular disorder, a central nervous system condition, or a chromosomal syndrome such as Down syndrome or Prader-Willi. The hypotonia code captures the sign; the aetiology code captures the diagnosis.","q":"How should the underlying cause be coded alongside hypotonia?"},{"a":"Refer promptly to paediatric neurology for acute or progressive hypotonia, a floppy neonate, hypotonia with feeding or respiratory compromise, or any loss of previously acquired tone or milestones. Stable longstanding low tone is appropriate for developmental therapy alongside work-up.","q":"When does low muscle tone need urgent referral?"}],"lang":"en","slug":"what-is-the-icd-11-classification-for-hypotonia-low-muscle-tone","title":"ICD-11 Classification of Hypotonia (Low Muscle Tone)","entity":{"key":"low-muscle-tone","kind":"condition","name":"Hypotonia (Low Muscle Tone)","slug":null},"lenses":[{"kind":"stakeholder","label":"Doctor","value":"doctor"},{"kind":"domain","label":"Motor","value":"motor"},{"kind":"intent","label":"Definition","value":"definition"},{"kind":"lifecycle","label":"Screen","value":"screen"},{"kind":"route","label":"Occupational-Therapy","value":"occupational-therapy"},{"kind":"empowerment","label":"Early Clarity","value":"early_clarity"}],"parent":{"key":"conditions","label":"Conditions"},"related":[{"lang":"en","slug":"what-are-the-known-contributing-factors-for-hypotonia-low-muscle-tone-in-early-childhood","title":"Contributing factors for hypotonia in early childhood"},{"lang":"en","slug":"what-is-hypotonia-low-muscle-tone-and-what-are-its-icd-11-features-in-early-childhood","title":"What is Hypotonia and its ICD-11 features in early childhood?"},{"lang":"en","slug":"which-icf-functioning-domains-does-hypotonia-low-muscle-tone-affect-in-early-childhood","title":"Hypotonia across ICF functioning domains in early childhood"},{"lang":"en","slug":"what-is-the-snomed-ct-concept-for-hypotonia-low-muscle-tone","title":"SNOMED CT Concept for Hypotonia (Low Muscle Tone)"},{"lang":"en","slug":"which-ichi-health-interventions-apply-to-hypotonia-low-muscle-tone-in-young-children","title":"Which ICHI health interventions apply to hypotonia in young children?"},{"lang":"en","slug":"is-hypotonia-low-muscle-tone-considered-a-disability","title":"Is Hypotonia (Low Muscle Tone) Considered a Disability?"}],"summary":"In ICD-11, hypotonia is classified as a clinical sign (MB47.4 Hypotonia) under symptoms and signs of the musculoskeletal system — a manifestation, not a diagnosis. The underlying central, peripheral, genetic or metabolic cause must be coded separately, and ICF describes its functional impact on posture, feeding and motor milestones.","answer_md":"*Hypotonia is a clinical sign, not a diagnosis in itself — and ICD-11 codes it accordingly.*\n\n## In short\nIn ICD-11, hypotonia (low muscle tone) is classified under the chapter on **symptoms, signs or clinical findings of the musculoskeletal system**, coded as **MB47.4 Hypotonia** within the broader \"Symptoms, signs or clinical findings, not elsewhere classified\" structure. Crucially, ICD-11 treats it as a *manifestation*, not an aetiological diagnosis — the underlying cause (central, peripheral, genetic, metabolic or syndromic) must be coded separately. Where hypotonia is congenital and benign, the descriptor **\"benign congenital hypotonia\"** is used clinically, but the coding still points to the sign plus its established cause.\n\n## The classification, in practice\nICD-11 deliberately separates the *sign* of reduced muscle tone from its origin, which keeps coding precise:\n\n- **The sign** — code the hypotonia (MB47.4) when low tone is the presenting finding under evaluation.\n- **The cause** — add the relevant aetiological code: e.g. neuromuscular disorders, central nervous system conditions, chromosomal or genetic syndromes (Down syndrome, Prader-Willi), or metabolic disease.\n- **Functioning** — ICD-11 pairs naturally with the WHO ICF framework to describe the *functional impact* of hypotonia on posture, feeding, gross-motor milestones and self-care, which is what therapy actually targets.\n\nThis matters clinically because hypotonia in an infant is a gateway sign: the coding hierarchy nudges the clinician toward localising the lesion (central versus peripheral) and pursuing the cause rather than stopping at the descriptive label.\n\n## When to escalate\nAcute or rapidly progressive hypotonia, hypotonia with respiratory or feeding compromise, loss of previously acquired tone or milestones, or a floppy neonate all warrant **prompt paediatric neurology referral**, not a therapy-first pathway. Stable, longstanding low tone with preserved strength is appropriately managed with developmental therapy alongside aetiological work-up.\n\n## The Pinnacle way\nA clinical AbilityScore® and any diagnosis are established **only at a Pinnacle Blooms Network centre, under qualified clinician care** — never from an online form. For a child with low tone, our clinicians map the functional impact across motor, feeding and self-care domains and build a graded plan through [occupational therapy](https://www.pinnacleblooms.org/best-occupational-therapy-center-india-proven-improvement-rate) and [physiotherapy](/physiotherapy), with the [AbilityScore® as the shared baseline](/ask/what-is-the-abilityscore-and-how-is-it-calculated) for measuring progress. Explore the [full network](/).\n\n## Trusted sources\nWHO ICD-11 for Mortality and Morbidity Statistics (symptoms and signs of the musculoskeletal system); WHO International Classification of Functioning, Disability and Health (ICF) for the functional framing of muscle-tone disorders.\n\n**Next step —** Reviewing a child with persistent low tone? [Partner with a Pinnacle clinician](https://www.pinnacleblooms.org/best-occupational-therapy-center-india-proven-improvement-rate) to baseline functional impact and co-ordinate the aetiological pathway.","canonical":"https://pinnacleblooms.org/ask/what-is-the-icd-11-classification-for-hypotonia-low-muscle-tone","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-hypotonia-low-muscle-tone","lang":"en","indexable":true}],"dimensions":[{"key":"conditions","label":"Conditions"}],"meta_title":"Hypotonia ICD-11 Classification (MB47.4)","meta_robots":"index, follow, max-image-preview:large","everyday_tip":"When coding hypotonia, always pair the sign with its aetiology and use the ICF framing to capture functional impact on posture, feeding and motor milestones — that combination drives the therapy plan, not the label alone.","published_at":"2026-06-10T10:52:00.07543+00:00","reading_paths":[{"key":"understand","items":[{"lang":"en","slug":"what-is-hypotonia-low-muscle-tone-and-what-are-its-icd-11-features-in-early-childhood","title":"What is Hypotonia and its ICD-11 features in early childhood?","reason":"Linked from this answer"},{"lang":"en","slug":"which-icf-functioning-domains-does-hypotonia-low-muscle-tone-affect-in-early-childhood","title":"Hypotonia across ICF functioning domains in early childhood","reason":"Linked from this answer"},{"lang":"en","slug":"what-is-the-snomed-ct-concept-for-hypotonia-low-muscle-tone","title":"SNOMED CT Concept for Hypotonia (Low Muscle Tone)","reason":"Linked from this answer"},{"lang":"en","slug":"is-hypotonia-low-muscle-tone-considered-a-disability","title":"Is Hypotonia (Low Muscle Tone) Considered a Disability?","reason":"Linked from this answer"},{"lang":"en","slug":"how-does-hypotonia-low-muscle-tone-affect-a-child-s-daily-life","title":"How 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