I would assume you most likely are referring to the input screen which asks you to indicate whether your child has a disability inorder to claim various credits and deductions. See here under the Subsection "As a Parent Of A Child With A Disabilty".
Under those rules, one of the conditions that must be met inorder for your son to considered disabled is that "he cannot engage in any substantial gainful activity because of a physical or mental condition.
No where is there any rule that suggests that a disabled child must sign up up for any kind of state disability program inorder for him to qualify and consider him to be your dependent
@megsbug2010
[Edited 01/18/2024|1:30 pm PST]
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