59 Modifier

Proper Use of the 59 Modifier

“I am part of a recovery audit from CMS for using a modifier 59. Cotiviti Healthcare has been hired by CMS to review my use of modifier 59. They stated that my operative report supports documented Charcot reconstruction and the use of application of external fixator (CPT 20692) but modifier 59 was inappropriately used since both procedures were performed at the same session. Should I have used a different modifier in this situation? Is application of an external fixator (CPT 20692) not considered a separate procedure if it is performed at the same session as other reconstruction procedures?"