We have always been told when billing Medicare for bilateral procedures to use modifier 50. ex. 20160 50. Recently we have been receiving rejections from Medicare stating the procedure code is inconsistent with the modifier used or a required modifier is missing. When contacting Medicare they are now stating we need to billing with modifier RT and LT. We cannot find any new policy related to this for either the Professional side of billing or/and the Facility side of billing. Has anyone else come across this issue recently?