20 ILCS 1705/43
To provide habilitation and care for persons with an intellectual disability and persons with a developmental disability and counseling for their families in accordance with programs established and conducted by the Department.
In assisting families to place such persons in need of care in licensed facilities for persons with an intellectual disability and persons with a developmental disability, the Department may supplement the amount a family is able to pay, as determined by the Department in accordance with Sections 5-105 through 5-116 of the "Mental Health and Developmental Disabilities Code" as amended, and the amount available from other sources. The Department shall have the authority to determine eligibility for placement of a person in a private facility.
Whenever a person with an intellectual disability or a client is placed in a private facility pursuant to this Section, such private facility must give the Department and the person's guardian or nearest relative, at least 30 days' notice in writing before such person may be discharged or transferred from the private facility, except in an emergency.
20 ILCS 1705/43