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How would you code this new procedure? Our thoughts are unlisted code 37799 with coil embolization code 37241. Help!! "Began with retrograde arterial access. Duplex U/S of brachial artery done-normal caliber. Using a guide catheter & guide wire, we selected the ulnar artery. Right arm angiogram performed demonstrating normal & patent brachial, ulnar, radial and interosseous artery on right. Brachial vein identified and punctured, then selectively cannulated ulnar vein. Rt arm venogram done demonstrating normal ulnar and brachial vein flow. 2 magnetic catheters placed into arterial and venous sheaths. Catheters were aligned to one another and magnets held artery & vein together. Radiofrequency electrode placed into venous cath & ceramic backstop placed in arterial catheter. Radiofrequency electrode energized for 2 seconds creating an anastomosis between ulnar vessels. Fistulogram done showing excellent flow. Brachial vein coil embolized at level of antecubital fossa with 2-8mm nestor coils. Good flow thru fistula on angio. Sheath removed & pressure held."