Ill. Admin. Code tit. 59, § 130.70
d) Applicants have the right to appeal a denial. The applicant must submit a written notice for an appeal to the Department. This notice must be received by the Department within 30 calendar days after the applicant receives the notice of denial. The appeal must contain a clear statement disputing the reasons for the denial. The notice of appeal should be mailed to:
Recovery and Mental Health Tax Credit Coordinator
Illinois Department of Human Services, Division of Mental Health
401 S Clinton St.
Chicago, IL 60607