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Could you please assist with the correct procedure code? I am unsure of which code is most appropriate (37799 or 37220). "5 French Cobra Glidecath was advanced through the sheath into the distal aorta and advanced over a Glidewire to the contralateral left internal iliac artery. Digital subtraction arteriography was performed over the pelvis and upper thigh. Cobra catheter was exchanged over a guidewire for a 12 mm diameter by 4 cm long angioplasty balloon, which required exchange of a 5 French angiographic sheath, a 4 a 7 French Balkan cross-over sheath, into the contralateral persistent sciatic artery. The antiplastic balloon was inflated across the arteriovenous fistula in the distal persistent sciatic artery, and digital subtraction arteriography of the popliteal and lower leg region was performed to the level of the hindfoot. The balloon was deflated and exchanged over a guidewire for a 5 French Davis catheter, which was advanced into the pseudoaneurysm arising from a persistent sciatic artery, and digital subtraction arteriography was performed."