N.Y. Comp. Codes R. & Regs. tit. 10, § 7-2.2
(d) A developmental disability is a severe, chronic disability of a person which is attributable to mental retardation, cerebral palsy, epilepsy, autism or neurological impairment, or is attributable to any other condition of a person similar to mental retardation, cerebral palsy, epilepsy, autism or neurological impairment because such condition results in similar impairment of general intellectual functioning and/or adaptive behavior and requires treatment and services similar to those required for such persons; originates before 18; is likely to continue indefinitely.