C7545 HCPCS - PERCUTANEOUS EXCHANGE OF BILIARY DRAINAGE CATHETER (EG, EXTERNAL, INTERNAL-EXTERNAL, OR CONVERSION OF INTERNAL-EXTERNAL TO EXTERNAL ONLY), WITH REMOVAL OF CALCULI/DEBRIS FROM BILIARY DUCT(S) AND/OR GALLBLADDER, INCLUDING DESTRUCTION OF CALCULI BY ANY METHOD (EG, MECHANICAL, ELECTROHYDRAULIC, LITHOTRIPSY) WHEN PERFORMED, INCLUDING DIAGNOSTIC CHOLANGIOGRAPHY(IES) WHEN PERFORMED, IMAGING GUIDANCE (EG, FLUOROSCOPY), AND ALL ASSOCIATED RADIOLOGICAL SUPERVISION AND INTERPRETATION