105 ILCS 5/10-22.3a
To provide for or to participate in provisions for insurance protection and benefits for its employees and their dependents including but not limited to retirement annuities, medical, surgical and hospitalization benefits in such types and amounts, if any, as shall be determined by the board, for the purpose of aiding in securing and retaining the services of competent employees. Where employee participation in such provisions is involved, the board, with the consent of the employee, may withhold deductions from the employee's salary necessary to defray the employee's share of such insurance costs. Such insurance or benefits may be contracted for only with an insurance company authorized to do business in this State. Such insurance may include provisions for employees and their dependents who rely on treatment by prayer or spiritual means alone for healing, in accordance with the tenets and practice of a recognized religious denomination.
For purposes of this Section, the term "dependent" means an employee's spouse and any unmarried child (1) under the age of 19 years including (a) an adopted child and (b) a step-child or recognized child who lives with the employee in a regular parent-child relationship, or (2) under the age of 23 who is enrolled as a full-time student in any accredited school, college or university. Nothing contained in this Code may preclude an elected school board member from participating in a group health insurance program provided to an employee of the school district that the board member serves if the board member is a dependent of that employee.
105 ILCS 5/10-22.3a