SNOMED CT Concept for Hypotonia (Low Muscle Tone)

Clinicians need the right terminology binding before hypotonia ever reaches a problem list — here is the SNOMED CT concept that carries it.

In short

In SNOMED CT, Hypotonia is represented by the concept Hypotonia (finding), with Concept ID 398151000 (fully specified name Hypotonia (finding)). It is a clinical finding describing reduced resting muscle tone — diminished resistance to passive movement — and is the appropriate coding anchor for documentation, referral and interoperability. Hypotonia is a sign, not a diagnosis in itself; the underlying aetiology (central, peripheral or mixed) drives the work-up.

The terminology, briefly

Hypotonia sits within the SNOMED CT Clinical finding hierarchy as a descendant of abnormal muscle tone findings. Related concepts you may encounter when refining a record include Decreased muscle tone and aetiology-specific entities such as Congenital hypotonia or Benign congenital hypotonia — each carries its own concept ID, so map to the most specific clinically supportable term rather than defaulting to the parent. For cross-system reporting, SNOMED CT findings map to ICD-11 classification entries; verify the current binding in your jurisdiction's terminology service, as identifiers and maps are versioned and should be confirmed against the live release rather than memorised.

When this matters clinically

Code hypotonia as a finding while the aetiological pathway is open. Central hypotonia (often with preserved or brisk reflexes) points toward neurological evaluation; peripheral hypotonia (with weakness and depressed reflexes) suggests neuromuscular assessment. In paediatric developmental practice, persistent low tone affecting feeding, head control, posture or gross-motor milestones warrants prompt developmental and, where indicated, neurological review — not therapy in isolation.

The Pinnacle way

A clinical AbilityScore® and any diagnosis are formed only at a Pinnacle Blooms Network centre, under qualified clinician care — never from a code or an online form. Accurate terminology is where structured care begins: it lets a child's profile travel cleanly across [our developmental services](/) and feed a reliable baseline via the clinician-administered AbilityScore®. Where low tone affects movement and posture, structured occupational and physiotherapy support is planned around that baseline.

Trusted sources

WHO ICD-11 classification of functioning and disease; SNOMED International clinical terminology framework; AAP developmental surveillance guidance.

Next step — Reviewing a child with persistent low tone? [Partner with a Pinnacle centre](/) for a clinician-led developmental assessment.