Ill. Admin. Code tit. 59, § 117.140
b) The application package shall include:
f) Documentation of severe and multiple impairments shall be based on a comprehensive, documented evaluation by a licensed clinical psychologist or a physician; and, depending on the individual's disability, one or more specialists. The evaluation shall verify that the individual has a substantial disability that can be expected to continue indefinitely. The individual meets the criteria for severe and multiple impairments based on a finding that criteria in subsections (f)(1) through (3) of this Section are met. Each item has its own sub-criteria which also shall be met, e.g., under subsection (f)(1)(A) or (B) of this Section, shall apply.
1) The evaluation determines the presence of a developmental disability based on:
2) The evaluation determines multiple handicaps in physical, sensory, behavioral and/or cognitive functioning which constitute a severe or profound impairment attributable to one or more of the following:
B) Sensory, which involves severe restriction due to hearing and/or visual impairment limiting the individual's movement and creating dependence in completing most daily activities.
C) Behavioral, which involves severe or profound deficits in adaptive hehavior or severe maladaptive behavior.
3) The evaluation determines that development is substantially less than expected for the individual's age in cognitive, affective or psychomotor behavior.
g) Individuals or their guardians may use existing evaluations if they meet the criteria above and were completed within the following time frames: