A top executive at Saint Luke's Health System is confident that the Saint Luke's Hospital of Kansas City will successfully appeal about $141,000 in Medicare charges that a federal watchdog report said the hospital overbilled. The disputed amount represents just more than a quarter of the total cost — $581,000 — according to a May report from the Office of the Inspector General [PDF]. RELATED: Feds: Saint Luke's overbilled Medicare by a half-million dollars The bulk of the billing missteps…