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How do you code conversion of a nephroureteral stent to an internal ureteral stent?

"The pre-existing left nephroureteral stent was injected with contrast, which demonstrates appropriate position of the proximal pigtail in the renal pelvis and the distal pigtail in the urinary bladder. A wire was advanced through the NU stent with the tip in the urinary bladder. Over that wire an 8 French x 24 cm internal ureteral stent was deployed with the distal pigtail in the urinary bladder and the proximal pigtail in the renal pelvis. Contrast was injected, confirming adequate drainage of the left renal pelvis to the urinary bladder. The cannula was removed.

IMPRESSION: Uncomplicated internalization of an 8 French x 24 cm internal ureteral stent."