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315 Specific delays in development

          A group of disorders in which a specific delay in development is the main
          feature. In each case development is related to biological maturation but it
          is also influenced by nonbiological factors and the coding carries no
          aetiological implications.
          Excludes: when due to a neurological disorder (320-389)

315.0 Specific reading retardation

          Disorders in which the main feature is a serious impairment in the development
          of reading or spelling skills which is not explicable in terms of general
          intellectual retardation or of inadequate schooling. Speech or language
          difficulties, impaired right-left differentiation, perceptuo-motor problems,
          and coding difficulties are frequently associated. Similar problems are often
          present in other members of the family. Adverse psychosocial factors may be
          present.
          Developmental dyslexia Specific spelling difficulty

315.1 Specific arithmetical retardation

          Disorders in which the main feature is a serious impairment in the development
          of arithmetical skills which is not explicable in terms of general
          intellectual retardation or of inadequate schooling.
          Dyscalculia

315.2 Other specific learning difficulties

          Disorders in which the main feature is a serious impairment in the development
          of other learning skills which are not explicable in terms of general
          intellectual retardation or of inadequate schooling.
          Excludes: specific arithmetical retardation (315.1)
           specific reading retardation (315.0)

315.3 Developmental speech or language disorder

          Disorders in which the main feature is a serious impairment in the development
          of speech or language [syntax or semantics] which is not explicable in terms
          of general intellectual retardation. Most commonly there is a delay in the
          development of normal word-sound production resulting in defects of
          articulation. Omissions or substitutions of consonants are most frequent.
          There may also be a delay in the production of spoken language. Rarely, there
          is also a developmental delay in the comprehension of sounds. Includes cases
          in which delay is largely due to environmental privation.
          Developmental aphasia Dyslalia
          Excludes: acquired aphasia (784.3)
           elective mutism (309.8, 313.0, 313.2)
           lisping and lalling (307.9)
           stammering and stuttering (307.0)

315.4 Specific motor retardation

          Disorders in which the main feature is a serious impairment in the development
          of motor coordination which is not explicable in terms of general intellectual
          retardation. The clumsiness is commonly associated with perceptual
          difficulties.
          Clumsiness syndrome Dyspraxia syndrome

315.5 Mixed development disorder

          A delay in the development of one specific skill [e.g., reading, arithmetic,
          speech or coordination] is frequently associated with lesser delays in other
          skills. When this occurs the coding should be made according to the skill
          most seriously impaired. The mixed category should be used only where the
          mixture of delayed skills is such that no one skill is preponderantly
          affected.

315.8 Other

315.9 Unspecified

          Developmental disorder NOS
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