CPT® Code 50436

Dilation of existing tract, percutaneous, for an endourologic procedure including imaging guidance (eg, ultrasound and/or fluoroscopy) and all associated radiological supervision and interpretation, with postprocedure tube placement, when performed;

The procedure described by CPT® Code 50436 involves the dilation of an existing percutaneous renal tract, which is a pathway created to facilitate urine drainage or diversion from the kidney. This may be necessary due to various medical conditions such as obstructions, leaks, or the presence of kidney stones. The dilation process is performed percutaneously, meaning it is done through the skin, and is guided by imaging techniques such as ultrasound and/or fluoroscopy. These imaging modalities are crucial as they provide real-time visualization of the renal anatomy, ensuring accurate placement of instruments and minimizing complications. During the procedure, a guide catheter is inserted into the existing tract and advanced to the targeted renal calyx and intrarenal collecting system. Serial dilators are then utilized to gradually increase the diameter of the tract to the desired size, after which the catheter is withdrawn. If necessary, a nephrostomy tube may be placed through the tract to maintain its patency, allowing for continued urine drainage. This procedure is often performed in conjunction with other related procedures, such as the creation of new access into the renal collecting system, which is coded separately under CPT® Code 50437. Both codes 50436 and 50437 encompass all associated radiological supervision and interpretation, ensuring comprehensive care during the endourologic procedure.