215 ILCS 5/356z.3
An insurer that issues, delivers, amends, or renews an individual or group policy of accident and health insurance in this State after the effective date of this amendatory Act of the 92nd General Assembly and arranges, contracts with, or administers contracts with a provider whereby beneficiaries are provided an incentive to use the services of such provider must include the following disclosure on its contracts and evidences of coverage: "WARNING, LIMITED BENEFITS WILL BE PAID WHEN NON-PARTICIPATING PROVIDERS ARE USED. You should be aware that when you elect to utilize the services of a non-participating provider for a covered service in non-emergency situations, benefit payments to such non-participating provider are not based upon the amount billed. The basis of your benefit payment will be determined according to your policy's fee schedule, usual and customary charge (which is determined by comparing charges for similar services adjusted to the geographical area where the services are performed), or other method as defined by the policy. YOU CAN EXPECT TO PAY MORE THAN THE COINSURANCE AMOUNT DEFINED IN THE POLICY AFTER THE PLAN HAS PAID ITS REQUIRED PORTION. Non-participating providers may bill members for any amount up to the billed charge after the plan has paid its portion of the bill, except as provided in Section 356z.3a of the Illinois Insurance Code for covered services received at a participating health care facility from a nonparticipating provider that are: (a) ancillary services, (b) items or services furnished as a result of unforeseen, urgent medical needs that arise at the time the item or service is furnished, or (c) items or services received when the facility or the non-participating provider fails to satisfy the notice and consent criteria specified under Section 356z.3a. Participating providers have agreed to accept discounted payments for services with no additional billing to the member other than co-insurance and deductible amounts. You may obtain further information about the participating status of professional providers and information on out-of-pocket expenses by calling the toll free telephone number on your identification card.".
215 ILCS 5/356z.3