I had workcomp case contract now lawyer settled, changing his fee

if there is a 3rd party at fault (other than your employer) than that would be a separate suit and the attorney may be entitled to additional fees, depending onj your agreement with them. In addition, the medical providers may have placed on liens on any recovery you recevie as part of your 3rd party claim, soit is certainly possible that these bills would need to be paid as part of any settlement.