# What is the ICD-11 classification for Developmental Regression?

Canonical: https://pinnacleblooms.org/ask/what-is-the-icd-11-classification-for-developmental-regression
Publisher: Pinnacle Blooms Network / Bharath Healthcare Laboratories Private Limited

Developmental regression is not a single ICD-11 diagnosis but a functional descriptor — the loss of previously acquired skills. ICD-11 records it as a symptom/finding and attributes it to an underlying condition (e.g. Disorders of Intellectual Development 6A00, Autism Spectrum Disorder 6A02, or a neurological/metabolic aetiology), which carries the primary code.

*Developmental regression is a clinical signal, not a diagnosis — and ICD-11 codes the loss, then asks you to look for why.*

## In short
Developmental regression — the loss of previously acquired skills in language, social, motor, cognitive or adaptive domains — is not a single ICD-11 diagnostic entity. It is a **functional descriptor** that ICD-11 captures in two ways: as a symptom/finding under **MB00–MB2Y (Symptoms, signs or clinical findings involving cognition, perception, emotional state and behaviour)**, and as a feature attributed to an underlying condition that carries its own code. The clinical task is to code the regression as observed, then identify and code its cause.

## How ICD-11 handles it
Unlike DSM, ICD-11 retired the standalone "childhood disintegrative disorder" category and folds regressive presentations into the umbrella of **Disorders of Intellectual Development (6A00)** and **Autism Spectrum Disorder (6A02)** where the clinical picture fits, with the loss-of-skills history recorded as a qualifier rather than a separate diagnosis. Where regression is symptomatic of a definable medical process, the primary code reflects that aetiology — for example, neurodegenerative and metabolic disorders (Chapter 8, diseases of the nervous system), epileptic encephalopathies (e.g. Landau–Kleffner), or genetic syndromes (Rett-type presentations).

Practically, this means ICD-11 coding for regression is layered: (1) the **functional finding** of skill loss, (2) the **developmental disorder** category if criteria are met, and (3) the **underlying aetiological diagnosis** once investigations clarify it. Documenting the trajectory — age of onset, domains affected, abruptness, and any plateau — drives the differential more than the code itself.

## When to refer
Genuine regression — true loss of established babble, words, gesture, social reciprocity, gait or self-care skills at any age — warrants **prompt** assessment, not watchful waiting. Stepwise or rapid loss, focal neurological signs, seizure-suggestive events or developmental arrest should trigger urgent paediatric neurology referral and consideration of metabolic, genetic and EEG workup before therapy-led pathways.

## The Pinnacle way
Developmental measurement supports care planning; diagnosis requires an appropriately qualified healthcare professional., under qualified clinician care — never from an online form or descriptor alone. For children with confirmed regression, our teams baseline current functioning, map the affected domains and coordinate with the treating medical team. Explore the [AbilityScore® and how it is established](/ask/what-is-the-abilityscore-and-how-is-it-calculated), our [speech therapy](https://www.pinnacleblooms.org/top-speech-therapy-center-india-proven-improvement-rate) and [occupational therapy](https://www.pinnacleblooms.org/best-occupational-therapy-center-india-proven-improvement-rate) pathways, or [start here](/).

## Trusted sources
WHO ICD-11 for Mortality and Morbidity Statistics (foundation and MMS chapters on neurodevelopmental disorders and symptoms/findings); WHO ICF model of functioning. Aetiological framing aligns with WHO Chapter 8 (nervous system) classifications.

**Next step —** When skill loss is documented, code the finding, pursue the cause, and baseline current ability — [partner with a Pinnacle clinical team](/) to coordinate the developmental assessment alongside medical workup.

## Sources
- WHO ICD-11 for Mortality and Morbidity Statistics: https://icd.who.int/
- WHO ICF model of functioning: https://www.who.int/standards/classifications/international-classification-of-functioning-disability-and-health

## Connected topics and perspectives
- Conditions: https://pinnacleblooms.org/ask/conditions
- Doctor: https://pinnacleblooms.org/ask/lens/stakeholder/doctor
- Context: https://pinnacleblooms.org/ask/lens/domain/context
- Definition: https://pinnacleblooms.org/ask/lens/intent/definition
- Screen: https://pinnacleblooms.org/ask/lens/lifecycle/screen
- Screen: https://pinnacleblooms.org/ask/lens/route/screen
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## Related question paths

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- Developmental Regression in Girls: https://pinnacleblooms.org/ask/do-girls-show-developmental-regression-differently
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### Explore causes & influences
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### Understand assessment
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### Explore therapy & support
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- How a teacher can include and support a child with developmental regression: https://pinnacleblooms.org/ask/how-can-a-teacher-include-and-support-a-young-child-with-developmental-regression-in-a-mainstream-classroom
- How therapy helps a child with developmental regression: https://pinnacleblooms.org/ask/how-does-therapy-help-a-child-with-developmental-regression-make-progress
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### At home & in everyday life
- Supporting Your Child with Developmental Regression at Home: https://pinnacleblooms.org/ask/how-can-i-support-my-child-with-developmental-regression-at-home