215 ILCS 5/370h
Before entering into any agreement under this Article an insurer or administrator shall establish terms and conditions that must be met by noninstitutional providers wishing to enter into an agreement with the insurer or administrator. These terms and conditions may not discriminate unreasonably against or among noninstitutional providers. Neither difference in prices among noninstitutional providers produced by a process of individual negotiation nor price differences among other noninstitutional providers in different geographical areas or different specialties constitutes unreasonable discrimination.
An insurer or administrator shall not refuse to contract with any noninstitutional provider who meets the terms and conditions established by the insurer or administrator.
215 ILCS 5/370h