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How do I code this report? "Technique: The internal/external biliary drain was prepped and draped. Contrast was injected, and a cholangiogram performed. This revealed a malignant obstruction of the distal CBD. No contrast enters the duodenum. Guidewire was advanced through the drain and into the duodenum. Sheath was placed at the insertion site. Under fluoroscopic guidance, a biliary covered stent was deployed at the level of the malignancy. It was then dilated with a balloon. Excellent result with brisk flow into the duodenum. No safety catheter was left. Impression: Successful internal biliary stent placement. No safety catheter was left."