A participant in a group insurance plan offered by a county, municipality, school board, local governmental unit, and special taxing unit, who discovers that he or she was overcharged by a hospital, physician, clinical lab, and other health care providers, shall receive a refund of 50 percent of any amount recovered as a result of such overcharge, up to a maximum of $1,000 per admission. All such instances of overcharge shall be reported to the Agency for Health Care Administration for action it deems appropriate.