Specialty Billing Built for Vascular Surgery Practices

Codes 37221-37226 are territory-specific endovascular revascularization codes: 37221 for aortoiliac, 37224 for femoral/popliteal, and 37226 for tibial/peroneal. Each code bundles the angioplasty, stent placement, and atherectomy work for that territory, and one code is reported per territory treated per limb. When intervention is performed in separate territories on the same limb, each territory is billed separately. When the same intervention is performed bilaterally, modifier 50 is appended. We apply territory-aware coding so each vessel is billed correctly and modifier 59 is used only where territories are genuinely distinct, preventing both bundling losses and compliance risk.

Modifier 50 is used when a vascular procedure with a bilateral indicator of 1 is performed on both paired limbs or both sides in the same session — for example, bilateral lower-extremity angioplasty/stenting or bilateral revascularization. The modifier reports the bilateral work and most payers pay 150% of the fee schedule. Not all vascular codes allow modifier 50, so we verify the bilateral indicator before applying it and follow each payer's submission format (one line with modifier 50, or two per-side lines). Bilateral limb intervention billed without modifier 50 is a common way vascular revenue is lost.

Endovascular aortic aneurysm repair (EVAR, 34708) is billed with the procedure code plus the endograft device and component codes captured at the case level, along with prior authorization for most commercial payers. Under-billing happens when the device and component codes are not captured separately from the procedure, or when the device cost isn't documented in the operative record. We capture the procedure, the endograft device, and any additional components for every EVAR case, with prior authorization obtained in advance, so the full procedure revenue — including the device — is recovered on these high-dollar aortic cases.

Open bypass procedures such as femoral-popliteal bypass (35556) carry post-operative global periods during which routine follow-up visits are bundled into the surgical payment. A staged or planned related procedure in the global uses modifier 58, an unplanned return to the OR uses modifier 78, and an unrelated E/M visit in the global uses modifier 24. For bypass graft surveillance and return procedures, the timing and indication determine whether the visit is bundled or separately billable. We track every bypass global period so follow-up and return procedures are billed with the correct modifier rather than denied as included in the global package.

Angiographic imaging codes such as extremity angiography (75716) and dialysis-circuit angiography (36902) are split into a professional component (modifier 26, the physician's interpretation) and a technical component (modifier TC, the facility's equipment and supplies). When the same provider performs both the procedure and the interpretation in a facility setting, the imaging is typically billed with modifier 26 only, because the facility owns the technical component. When performed in a non-facility setting, the global service may be billed. We apply the correct 26/TC split based on the rendering setting and who owns the equipment, preventing denials from incorrect component billing.