Boundary Comparison Lab · F80-F89

Compare any two F80-F89 categories

Pick two categories and see what actually discriminates them: overlap, decisive evidence, duration/course, exclusions, and the common trap. This is a separate learning mode from the Differential Decision Lab — here you are studying a boundary directly, not making a single timed decision.

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• F80 vs F81

  Distinguish a specific developmental disorder of speech and language (F80) from a specific developmental disorder of scholastic skills (F81), using which skill domain is primarily and specifically affected rather than treating any early language-related difficulty as automatically predicting a later reading or spelling disorder.

• F80 vs F84

  Distinguish an isolated specific developmental disorder of speech and language (F80) from a pervasive developmental disorder (F84), using whether the full social-interaction/communication/restricted-behaviour triad is present rather than treating any language delay as potentially autism.

• F81 vs F83

  Distinguish a specific developmental disorder confined to scholastic skills (F81) from the residual mixed category (F83), used when specific developmental disorders of speech/language, scholastic skills, and motor function are all present together without one clearly predominating.

• F82 vs F83

  Distinguish a specific developmental disorder of motor function (F82) confined to motor coordination from the residual mixed category (F83), used when specific developmental disorders across domains are present together without one clearly predominating.

• F84 vs F70

  Distinguish a pervasive developmental disorder (F84) from intellectual disability (F70) presenting on its own, using the presence or absence of the qualitative social-interaction/communication/restricted-behaviour triad rather than global cognitive level — a cross-block boundary check, since the two conditions frequently co-occur and can both be coded together when both are genuinely present.

• F88 vs F89

  Distinguish the residual 'other' category for developmental disorders (F88, a genuine but atypically-patterned developmental disorder that does not fit F80-F84) from the residual 'unspecified' category (F89, used when a developmental disorder is present but the available information does not support any further specification), reinforcing the same 'other versus unspecified' reasoning pattern used across the rest of this application's other block-level residual pairs.

Only comparisons involving a currently available category appear here. As more categories are authored, more comparison pairs will appear.