33880

Endovascular repair of descending thoracic aorta (e.g., aneurysm, pseudoaneurysm, dissection, penetrating ulcer, intramural hematoma, or traumatic disruption); involving coverage of left subclavian artery origin, initial endoprosthesis plus descending thoracic aortic extension(s), if required, to level of celiac artery origin

The CPT code 33880 describes a highly specialized and complex endovascular surgical procedure utilized for the treatment and repair of the descending thoracic aorta. This minimally invasive alternative to traditional open thoracic surgery is generally employed to manage life-threatening thoracic aortic pathologies, including but not limited to thoracic aortic aneurysms (TAA), pseudoaneurysms, acute or chronic aortic dissections, penetrating atherosclerotic ulcers, intramural hematomas, and traumatic aortic disruptions. Specifically, this code covers the initial placement of an endoprosthesis (stent graft) where the deployment zone necessitates the deliberate coverage of the left subclavian artery origin to achieve an adequate proximal seal zone. Furthermore, the code encompasses any additional descending thoracic aortic extensions that may be required distally, extending down to the level of the celiac artery origin. During the procedure, the patient is typically placed under general anesthesia, and continuous hemodynamic monitoring is established. Vascular access is secured, most commonly via the common femoral artery, either through an open surgical cutdown or a fully percutaneous approach. Systemic anticoagulation is administered to prevent thromboembolic complications. Using advanced fluoroscopic imaging and over-the-wire techniques, a large-bore delivery sheath is advanced into the thoracic aorta. Diagnostic angiography is performed to precisely delineate the aortic anatomy, identify the exact location and extent of the pathology, and define the landing zones for the stent graft. The endoprosthesis is meticulously positioned across the diseased segment of the descending thoracic aorta. In the case of CPT 33880, the proximal deployment deliberately covers the ostium of the left subclavian artery to ensure a secure and durable seal, thereby excluding the pathology from systemic arterial pressure. Following deployment, additional distal extensions may be placed to adequately cover the diseased segment down to the celiac artery. Completion angiography is strictly required to verify the accurate placement of the graft, ensure the complete exclusion of the aneurysm or dissection, and confirm the absence of any endoleaks. Once the repair is deemed successful, the delivery system is carefully withdrawn, and the access site is repaired to achieve complete hemostasis. The extensive nature of this procedure requires meticulous preoperative planning, intraoperative precision, and comprehensive postoperative care to minimize the risk of complications such as spinal cord ischemia, stroke, and vascular injury.

Clinical Indications

  • Descending thoracic aortic aneurysm (TAA) with a high risk of rupture or significant expansion.
  • Acute or chronic type B aortic dissection with complications such as malperfusion syndrome, rapid expansion, or impending rupture.
  • Penetrating atherosclerotic ulcer (PAU) of the descending thoracic aorta.
  • Intramural hematoma (IMH) involving the descending thoracic aorta.
  • Traumatic aortic transection or disruption, often resulting from rapid deceleration injuries.
  • Thoracic aortic pseudoaneurysm.
  • Aortic pathology requiring proximal graft deployment that covers the origin of the left subclavian artery for an adequate seal zone.

Procedure Steps

  1. The patient is positioned supine on a radiolucent table, prepped, and draped under sterile conditions.
  2. General anesthesia is induced, and continuous hemodynamic monitoring (including a radial or brachial arterial line) is established.
  3. Cerebrospinal fluid (CSF) drain placement may be performed prior to the procedure to minimize the risk of spinal cord ischemia, depending on the extent of aortic coverage.
  4. Arterial access is obtained, typically via the common femoral or iliac arteries, through an open surgical cutdown or a percutaneous approach using specific closure devices.
  5. Systemic heparin is administered to achieve the target activated clotting time (ACT).
  6. A pigtail catheter is introduced, typically via the contralateral femoral artery or a brachial/radial artery, and advanced into the ascending aorta.
  7. Initial diagnostic thoracic aortography is performed to identify the pathology, measure aortic diameters, and confirm proximal and distal landing zones.
  8. A stiff guidewire is advanced through the primary access site into the ascending aorta or aortic arch.
  9. The endoprosthesis delivery system is advanced over the stiff wire under continuous fluoroscopic guidance into the descending thoracic aorta.
  10. The stent graft is meticulously positioned, deliberately covering the origin of the left subclavian artery to ensure an adequate proximal seal.
  11. The endoprosthesis is deployed, and if necessary, additional distal extension grafts are placed over the wire to extend the repair to the level of the celiac artery origin.
  12. Balloon dilation of the graft attachment zones may be performed using a compliant balloon to ensure optimal apposition to the aortic wall.
  13. A completion aortogram is performed to confirm the exclusion of the pathology, verify the absence of endoleaks, and assess the patency of essential branch vessels.
  14. The delivery systems, sheaths, and guidewires are removed.
  15. Arteriotomy closure is performed using surgical repair or deployed percutaneous closure devices, and complete hemostasis is verified.

Coding Guidelines

  • CPT code 33880 specifically includes the initial endoprosthesis and any descending thoracic aortic extension(s) down to the level of the celiac artery origin. Do not separately report distal extensions that do not cross the celiac artery.
  • The code requires that the proximal landing zone covers the origin of the left subclavian artery. If the left subclavian artery is not covered, use CPT code 33881.
  • Radiological supervision and interpretation (RS&I) is not included in 33880 and must be reported separately using CPT code 75956.
  • Arterial exposure or access procedures (e.g., open femoral or iliac exposure, or percutaneous access) should be reported separately using appropriate codes (e.g., 34812, 34820, 34833).
  • Prophylactic revascularization of the left subclavian artery (e.g., carotid-subclavian bypass or transposition) performed prior to or during the same session is reported separately with appropriate bypass or transposition codes (e.g., 33889, 33891).
  • Placement of a proximal extension prosthesis to extend the repair into the aortic arch is reported separately using 33886.
  • Routine balloon angioplasty within the endoprosthesis is included in the base procedure and should not be reported separately.

Associated ICD-10 Codes