In Washington State a Developmental Disability is defined as:
- Being attributable to an intellectual disability, cerebral palsy, epilepsy, autism, another neurological or other condition found by the department to be closely related to an intellectual disability or requiring treatment similar to that required for individuals with an intellectual disability which:
- Originates prior to age eighteen
- Is expected to continue indefinitely and
- Results in substantial limitations to an individual's cognitive and/or adaptive functioning
- Children age 6 through 9: May be determined eligible due to developmental delays applicable to children under age 6 or other eligible conditions applicable to person age 10 and older.
- Applicants age 10 and older: Must meet eligibility criteria for intellectual disability, cerebral palsy, epilepsy, autism, another neurological or other condition similar to an intellectual disability with an IQ of 69 or below.