215 ILCS 5/1013

No insurance institution or agent may base an adverse underwriting decision in whole or in part: (A) on the fact of a previous adverse underwriting decision or on the fact that an individual previously obtained insurance coverage through a residual market mechanism; provided, however, an insurance institution or agent may base an adverse underwriting decision on further information obtained from an insurance institution or agent responsible for a previous adverse underwriting decision; (B) on personal information received from an insurance-support organization whose primary source of information is insurance institutions; provided, however, an insurance institution or agent may base an adverse underwriting decision on further personal information obtained as the result of information received from such insurance-support organization.