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 CAN EXPECT TO PAY MORE THAN THE COST-SHARING AMOUNT DEFINED IN THE POLICY IN NON-EMERGENCY SITUATIONS. Except in limited situations governed by the federal No Surprises Act or Section 356z.3a of the Illinois Insurance Code (215 ILCS 5/356z.3a), non-participating providers furnishing non-emergency services may bill members for any amount up to the billed charge after the plan has paid its portion of the bill. If you elect to use a non-participating provider, plan benefit payments 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. Participating providers have agreed to ONLY bill members the cost-sharing 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