Developmental Language Disorder: ICD-11 Definition & Early Features

The child who understands far more than they can say — and whose words lag behind every other domain — is often a child with DLD, not a child who is simply "slow to talk".

In short

Developmental Language Disorder (DLD), coded 6A01.2 in ICD-11-MMS, is a persistent difficulty in acquiring, understanding, producing or using language that emerges in the developmental period and falls substantially below age expectations. Crucially, it is not attributable to hearing impairment, intellectual disability, autism, neurological injury or environmental deprivation — the language deficit is the primary, disproportionate problem.

The science, briefly

Under ICD-11, DLD sits within developmental speech or language disorders. In early childhood the picture typically includes delayed onset of first words and word combinations, restricted expressive vocabulary, immature or error-prone grammar (morphosyntax), and difficulties with comprehension that may be subtler and under-recognised. Receptive and expressive subtypes are distinguished clinically. The deficits are persistent rather than transient — distinguishing DLD from the late-talker who self-corrects — and they impair everyday communication, social participation and later literacy. Standardised language assessment, normal-range nonverbal ability and exclusion of differential causes (notably hearing loss and ASD) anchor the working formulation.

The Pinnacle way

AbilityScore® is part of Pinnacle’s developmental assessment. Diagnosis, where needed, requires an appropriately qualified healthcare professional — never from an online form. Pinnacle pairs structured language profiling with targeted speech therapy and family coaching. Explore Developmental Language Disorder and how the AbilityScore® is established.

Trusted sources

WHO ICD-11-MMS (6A01.2); ASHA practice guidance on language disorders.

Next step — Refer a child with disproportionate, persistent language delay for structured assessment at a Pinnacle centre.

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