225 ILCS 60/49
If any person does any of the following and does not possess a valid license issued under this Act, that person shall be sentenced as provided in Section 59: (i) holds himself or herself out to the public as being engaged in the diagnosis or treatment of physical or mental ailments or conditions including, but not limited to, deformities, diseases, disorders, or injuries of human beings; (ii) suggests, recommends or prescribes any form of treatment for the palliation, relief or cure of any physical or mental ailment or condition of any person with the intention of receiving, either directly or indirectly, any fee, gift, or compensation whatever; (iii) diagnoses or attempts to diagnose, operates upon, professes to heal, prescribes for, or otherwise treats any ailment or condition, or supposed ailment or condition, of another; (iv) maintains an office for examination or treatment of persons afflicted, or alleged or supposed to be afflicted, by any ailment or condition; (v) manipulates or adjusts osseous or articular structures; or (vi) attaches the title Doctor, Physician, Surgeon, M.D., D.O. or D.C. or any other word or abbreviation to his or her name indicating that he or she is engaged in the treatment of human ailments or conditions as a business.
Whenever the Department has reason to believe that any person has violated this Section the Department may issue a rule to show cause why an order to cease and desist should not be entered against that person. The rule shall clearly set forth the grounds relied upon by the Department and shall provide a period of 7 days from the date of the rule to file an answer to the satisfaction of the Department. Failure to answer to the satisfaction of the Department shall cause an order to cease and desist to be issued immediately.
225 ILCS 60/49