Can someone please help me out with a mod 52? Our US dept in the hospital has been charging a chest us 76604 when an us guided thoraentesis has been discontinued due to not enough fluid. Should they be charging 76941(us guided ndl plcmnt) with mod 52 and no thoracentesis code instead? Images are taken and dictated as us guided ndl plcmnt, no adequate fluid pocket, no thoracentesis performed.