Speech/Language . Therapists often code for Developmental Apraxia when insurances won't pay for SLT for Receptive &/or Expressive Language Disorder. Full evaluation may also reveal Autistic Spectrum Disorder, Intellectual Disability, Social Communication Disorder or, at 5 or >, Specific Language Impairment. Mutant FOXP2 genes on Chr. 7 cause familial DA or SLI. The incidence of DA is 0.1-0.2 % of children. .