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Official Description

Placement of proximal extension prosthesis for endovascular repair of descending thoracic aorta (eg, aneurysm, pseudoaneurysm, dissection, penetrating ulcer, intramural hematoma, or traumatic disruption); each additional proximal extension (List separately in addition to code for primary procedure)

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The CPT® Code 33884 refers to the placement of a proximal extension prosthesis specifically for the endovascular repair of the descending thoracic aorta. This procedure is indicated for various conditions affecting the aorta, including aneurysms, pseudoaneurysms, dissections, penetrating ulcers, intramural hematomas, or traumatic disruptions. The endovascular approach involves accessing the aorta through a puncture in an artery, typically the femoral or iliac artery, allowing for the insertion of a flexible guidewire. This guidewire is navigated retrograde into the ascending aorta, often with the assistance of fluoroscopic guidance, which is a separate reportable service. In some cases, access through the brachial artery may also be necessary to facilitate the placement of the proximal extension components. Once access is established, a sheath is placed in the contralateral femoral or iliac artery, and a second guidewire is advanced into the ascending aorta. An aortogram is performed to evaluate the proximal aspect of the aneurysm, and an ultrasound probe is used to measure the proximal extension site. A stent-graft extension prosthesis is then selected based on these measurements. The procedure involves exchanging guidewires and sheaths to prepare for the deployment of the stent-graft extension prosthesis, which is carefully maneuvered into position. After verifying the correct placement with another aortogram, the prosthesis is deployed, and the overlapping segments are ballooned and sealed to ensure a secure fit. The final step includes obtaining another aortogram to confirm the complete exclusion of the defect in the thoracic aorta and to check for any potential leakage, ensuring the success of the procedure.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The placement of a proximal extension prosthesis for endovascular repair of the descending thoracic aorta is indicated for the following conditions:

  • Aneurysm - A localized enlargement of the aorta that can lead to rupture if not treated.
  • Pseudoaneurysm - A false aneurysm that occurs when blood leaks out of the artery but is contained by surrounding tissue.
  • Dissection - A serious condition where there is a tear in the inner layer of the aorta, allowing blood to flow between the layers of the artery wall.
  • Pentrating Ulcer - A condition where an ulcer penetrates the aortic wall, potentially leading to serious complications.
  • Intramural Hematoma - A collection of blood within the wall of the aorta, which can compromise the integrity of the vessel.
  • Traumatic Disruption - Injury to the aorta resulting from trauma, which may require surgical intervention to repair.

2. Procedure

The procedure for placing a proximal extension prosthesis involves several critical steps:

  • Step 1: Access is gained through a puncture in the femoral or iliac artery, where a flexible guidewire is introduced retrograde into the ascending aorta, often utilizing fluoroscopic guidance.
  • Step 2: If necessary, access through the brachial artery may be performed to assist in the placement of the proximal extension components.
  • Step 3: The contralateral femoral or iliac artery is punctured, and a sheath is placed, followed by the advancement of a second guidewire into the ascending aorta.
  • Step 4: An aortogram is conducted to evaluate the proximal aspect of the aneurysm, and an ultrasound probe is introduced to measure the proximal extension site accurately.
  • Step 5: A properly sized stent-graft extension prosthesis is selected based on the measurements obtained.
  • Step 6: One of the flexible guidewires is removed and exchanged for a stiff guidewire, and one of the sheaths is replaced with an introducer sheath to facilitate the deployment of the stent-graft extension prosthesis.
  • Step 7: The stent-graft extension prosthesis is loaded and maneuvered into the correct position within the aorta.
  • Step 8: Another aortogram is performed to verify the correct positioning of the extension prosthesis before it is deployed.
  • Step 9: The overlapping segment of the stent-graft and the proximal extension prosthesis is ballooned and sealed to ensure a secure fit.
  • Step 10: The proximal end of the extension prosthesis is also ballooned and sealed to the aorta to complete the repair.
  • Step 11: Once all proximal extensions are in place, a final aortogram is obtained to confirm complete exclusion of the defect in the thoracic aorta and to check for any leakage.

3. Post-Procedure

Post-procedure care involves monitoring the patient for any complications that may arise following the placement of the proximal extension prosthesis. This includes observing for signs of leakage, ensuring proper blood flow, and managing any potential post-operative pain. Follow-up imaging studies, such as aortograms or ultrasounds, may be required to assess the integrity of the repair and to confirm that the aorta is functioning correctly without any complications. The healthcare team will provide specific instructions regarding activity restrictions and follow-up appointments to ensure optimal recovery.

Short Descr ENDOVASC PROSTH TAA ADD-ON
Medium Descr PLMT PROX XTN PROSTH EVASC RPR DTA EA PROX XTN
Long Descr Placement of proximal extension prosthesis for endovascular repair of descending thoracic aorta (eg, aneurysm, pseudoaneurysm, dissection, penetrating ulcer, intramural hematoma, or traumatic disruption); each additional proximal extension (List separately in addition to code for primary procedure)
Status Code Active Code
Global Days ZZZ - Code Related to Another Service
PC/TC Indicator (26, TC) 0 - Physician Service Code
Multiple Procedures (51) 0 - No payment adjustment rules for multiple procedures apply.
Bilateral Surgery (50) 0 - 150% payment adjustment for bilateral procedures does NOT apply.
Physician Supervisions 09 - Concept does not apply.
Assistant Surgeon (80, 82) 2 - Payment restriction for assistants at surgery does not apply to this procedure...
Co-Surgeons (62) 2 - Co-surgeons permitted and no documentation required if the two- specialty requirement is met.
Team Surgery (66) 0 - Team surgeons not permitted for this procedure.
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator Inpatient Procedures, not paid under OPPS
Type of Service (TOS) 2 - Surgery
Berenson-Eggers TOS (BETOS) P1G - Major procedure - Other
MUE 2
CCS Clinical Classification 52 - Aortic resection, replacement or anastomosis

This is an add-on code that must be used in conjunction with one of these primary codes.

33883 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Placement of proximal extension prosthesis for endovascular repair of descending thoracic aorta (eg, aneurysm, pseudoaneurysm, dissection, penetrating ulcer, intramural hematoma, or traumatic disruption); initial extension
34713 Addon Code MPFS Status: Active Code APC N ASC N1 Percutaneous access and closure of femoral artery for delivery of endograft through a large sheath (12 French or larger), including ultrasound guidance, when performed, unilateral (List separately in addition to code for primary procedure)
34714 Addon Code MPFS Status: Active Code APC N ASC N1 Open femoral artery exposure with creation of conduit for delivery of endovascular prosthesis or for establishment of cardiopulmonary bypass, by groin incision, unilateral (List separately in addition to code for primary procedure)
34715 Addon Code MPFS Status: Active Code APC N ASC N1 Open axillary/subclavian artery exposure for delivery of endovascular prosthesis by infraclavicular or supraclavicular incision, unilateral (List separately in addition to code for primary procedure)
34716 Addon Code MPFS Status: Active Code APC N ASC N1 Open axillary/subclavian artery exposure with creation of conduit for delivery of endovascular prosthesis or for establishment of cardiopulmonary bypass, by infraclavicular or supraclavicular incision, unilateral (List separately in addition to code for primary procedure)
34812 Addon Code Resequenced Code MPFS Status: Active Code APC C CPT Assistant Article Open femoral artery exposure for delivery of endovascular prosthesis, by groin incision, unilateral (List separately in addition to code for primary procedure)
34820 Addon Code Resequenced Code MPFS Status: Active Code APC C CPT Assistant Article Open iliac artery exposure for delivery of endovascular prosthesis or iliac occlusion during endovascular therapy, by abdominal or retroperitoneal incision, unilateral (List separately in addition to code for primary procedure)
34833 Addon Code Resequenced Code MPFS Status: Active Code APC C CPT Assistant Article Open iliac artery exposure with creation of conduit for delivery of endovascular prosthesis or for establishment of cardiopulmonary bypass, by abdominal or retroperitoneal incision, unilateral (List separately in addition to code for primary procedure)
34834 Addon Code Resequenced Code MPFS Status: Active Code APC C CPT Assistant Article Open brachial artery exposure for delivery of endovascular prosthesis, unilateral (List separately in addition to code for primary procedure)
37252 Addon Code MPFS Status: Active Code APC N ASC N1 Intravascular ultrasound (noncoronary vessel) during diagnostic evaluation and/or therapeutic intervention, including radiological supervision and interpretation; initial noncoronary vessel (List separately in addition to code for primary procedure)
37253 Addon Code MPFS Status: Active Code APC N ASC N1 Intravascular ultrasound (noncoronary vessel) during diagnostic evaluation and/or therapeutic intervention, including radiological supervision and interpretation; each additional noncoronary vessel (List separately in addition to code for primary procedure)
58 Staged or related procedure or service by the same physician or other qualified health care professional during the postoperative period: it may be necessary to indicate that the performance of a procedure or service during the postoperative period was: (a) planned or anticipated (staged); (b) more extensive than the original procedure; or (c) for therapy following a surgical procedure. this circumstance may be reported by adding modifier 58 to the staged or related procedure. note: for treatment of a problem that requires a return to the operating/procedure room (eg, unanticipated clinical condition), see modifier 78.
59 Distinct procedural service: under certain circumstances, it may be necessary to indicate that a procedure or service was distinct or independent from other non-e/m services performed on the same day. modifier 59 is used to identify procedures/services, other than e/m services, that are not normally reported together, but are appropriate under the circumstances. documentation must support a different session, different procedure or surgery, different site or organ system, separate incision/excision, separate lesion, or separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same individual. however, when another already established modifier is appropriate it should be used rather than modifier 59. only if no more descriptive modifier is available, and the use of modifier 59 best explains the circumstances, should modifier 59 be used. note: modifier 59 should not be appended to an e/m service. to report a separate and distinct e/m service with a non-e/m service performed on the same date, see modifier 25.
62 Two surgeons: when 2 surgeons work together as primary surgeons performing distinct part(s) of a procedure, each surgeon should report his/her distinct operative work by adding modifier 62 to the procedure code and any associated add-on code(s) for that procedure as long as both surgeons continue to work together as primary surgeons. each surgeon should report the co-surgery once using the same procedure code. if additional procedure(s) (including add-on procedure(s) are performed during the same surgical session, separate code(s) may also be reported with modifier 62 added. note: if a co-surgeon acts as an assistant in the performance of additional procedure(s), other than those reported with the modifier 62, during the same surgical session, those services may be reported using separate procedure code(s) with modifier 80 or modifier 82 added, as appropriate.
78 Unplanned return to the operating/procedure room by the same physician or other qualified health care professional following initial procedure for a related procedure during the postoperative period: it may be necessary to indicate that another procedure was performed during the postoperative period of the initial procedure (unplanned procedure following initial procedure). when this procedure is related to the first, and requires the use of an operating/procedure room, it may be reported by adding modifier 78 to the related procedure. (for repeat procedures, see modifier 76.)
80 Assistant surgeon: surgical assistant services may be identified by adding modifier 80 to the usual procedure number(s).
82 Assistant surgeon (when qualified resident surgeon not available): the unavailability of a qualified resident surgeon is a prerequisite for use of modifier 82 appended to the usual procedure code number(s).
GC This service has been performed in part by a resident under the direction of a teaching physician
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
Date
Action
Notes
2011-01-01 Changed Short description changed.
2006-01-01 Added First appearance in code book in 2006.
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