An employer or their worker's compensation insurance provider may deny benefits because they believe an injury was not work-related or for other reasons. In these cases, you can file a claim with the Illinois Workers' Compensation Commission (IWCC) and request a hearing with an arbitrator. Unfavorable decisions by an arbitrator can be appealed, and these cases will be heard by a panel of IWCC commissioners. If necessary, additional appeals can be filed in a circuit court, appellate court, or the Illinois Supreme Court.