210 ILCS 88/20
If a hospital bills a patient for health care services, the hospital shall provide with its bill the following information:
(6) notice that the patient may obtain an itemized bill upon request.
If a hospital bills a patient, then the hospital must provide an itemized statement of charges for the inpatient and outpatient services rendered by the hospital upon receiving a request from the patient.
(Source: P.A. 94-885, eff. 1-1-07.)