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Official Description

Repair of thoracoabdominal aortic aneurysm with graft, with or without cardiopulmonary bypass

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The CPT® Code 33877 refers to the surgical procedure known as the repair of a thoracoabdominal aortic aneurysm using a graft, which may be performed with or without the use of cardiopulmonary bypass. A thoracoabdominal aortic aneurysm is a serious condition characterized by an abnormal dilation of the aorta that occurs in the thoracic region and extends into the abdominal aorta. This type of aneurysm typically originates below the left subclavian artery and can pose significant risks, including rupture and life-threatening hemorrhage. The procedure involves a thoracoabdominal approach, which requires careful dissection and exposure of the aorta. During the surgery, the aneurysm sac is opened, and any thrombus or plaque is removed to facilitate the placement of a synthetic tube graft or conduit. This graft is then sutured to the healthy segments of the aorta, both proximal and distal to the aneurysm site, ensuring proper blood flow is restored. The procedure is complex and requires meticulous attention to detail, particularly when managing the surrounding structures, such as the lumbar and inferior mesenteric arteries, and ensuring that blood flow to the renal arteries is preserved if the aneurysm extends to that area. The successful completion of this procedure is critical for preventing complications associated with thoracoabdominal aortic aneurysms.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure described by CPT® Code 33877 is indicated for patients diagnosed with thoracoabdominal aortic aneurysms. These aneurysms can lead to serious complications, including rupture, which can be life-threatening. The following conditions may warrant the performance of this surgical intervention:

  • Thoracoabdominal Aortic Aneurysm: A dilation of the aorta that extends from the thoracic region into the abdominal aorta, typically originating below the left subclavian artery.
  • Risk of Rupture: Patients exhibiting signs of aneurysm expansion or those with a history of aneurysm-related complications may require surgical repair to prevent rupture.
  • Symptomatic Aneurysms: Patients presenting with symptoms such as back pain, abdominal pain, or other related symptoms may necessitate intervention.

2. Procedure

The surgical procedure for CPT® Code 33877 involves several critical steps to ensure the successful repair of the thoracoabdominal aortic aneurysm:

  • Step 1: Thoracoabdominal Approach The procedure begins with a thoracoabdominal incision, allowing access to both the thoracic and abdominal aorta. The duodenum is carefully dissected away from the abdominal aorta to expose the aorta adequately.
  • Step 2: Establishing Proximal Control Proximal control of the aorta is established below the left subclavian artery or more distally, depending on the extent of the aneurysm's involvement in the thoracic aorta.
  • Step 3: Establishing Distal Control Distal control is achieved by clamping the aorta above the iliac arteries, ensuring that blood flow is managed effectively during the procedure.
  • Step 4: Aneurysm Sac Opening The aneurysm sac is opened longitudinally, allowing for the removal of any aortic thrombus and plaque that may be present within the sac.
  • Step 5: Oversewing of Arteries The lumbar arteries and the inferior mesenteric artery are oversewn to prevent blood loss and to prepare for the graft placement.
  • Step 6: Graft Placement A synthetic tube graft or conduit is sutured to the healthy aorta proximal to the site of the aneurysm. If the aneurysm extends to the renal arteries, the distal anastomosis may be beveled to incorporate these vessels. In cases where the aneurysm reaches the iliac bifurcation, the visceral and renal vessels are reattached to the tube graft or conduit.
  • Step 7: Distal Anastomosis The distal aorta is then anastomosed to the tube graft or conduit, ensuring a secure connection that restores normal blood flow.
  • Step 8: Closure After the graft is in place, the aneurysm sac is closed over the graft. Clamps are released to re-establish blood flow, and the retroperitoneum is repaired. Finally, the abdomen is closed, completing the procedure.

3. Post-Procedure

Post-procedure care following the repair of a thoracoabdominal aortic aneurysm includes monitoring for complications such as bleeding, infection, or graft failure. Patients may require intensive care for a period following surgery to ensure stable hemodynamics and to manage any potential complications. Pain management and gradual mobilization are essential components of recovery. Follow-up imaging studies may be necessary to assess the integrity of the graft and the aorta, ensuring that there are no signs of complications such as aneurysm recurrence or graft-related issues. The healthcare team will provide specific instructions regarding activity restrictions and follow-up appointments to monitor the patient's recovery progress.

Short Descr THORACOABDOMINAL GRAFT
Medium Descr RPR THORACOABDOMINAL AORTIC ANEURYS W/WO BYPASS
Long Descr Repair of thoracoabdominal aortic aneurysm with graft, with or without cardiopulmonary bypass
Status Code Active Code
Global Days 090 - Major Surgery
PC/TC Indicator (26, TC) 0 - Physician Service Code
Multiple Procedures (51) 2 - Standard 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) P2F - Major procedure, cardiovascular-Other
MUE 1
CCS Clinical Classification 52 - Aortic resection, replacement or anastomosis

This is a primary code that can be used with these additional add-on codes.

33257 Addon Code MPFS Status: Active Code APC C Illustration for Code Operative tissue ablation and reconstruction of atria, performed at the time of other cardiac procedure(s), limited (eg, modified maze procedure) (List separately in addition to code for primary procedure)
33258 Addon Code MPFS Status: Active Code APC C Illustration for Code Operative tissue ablation and reconstruction of atria, performed at the time of other cardiac procedure(s), extensive (eg, maze procedure), without cardiopulmonary bypass (List separately in addition to code for primary procedure)
33259 Addon Code MPFS Status: Active Code APC C Illustration for Code Operative tissue ablation and reconstruction of atria, performed at the time of other cardiac procedure(s), extensive (eg, maze procedure), with cardiopulmonary bypass (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)
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)
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)
GC This service has been performed in part by a resident under the direction of a teaching physician
22 Increased procedural services: when the work required to provide a service is substantially greater than typically required, it may be identified by adding modifier 22 to the usual procedure code. documentation must support the substantial additional work and the reason for the additional work (ie, increased intensity, time, technical difficulty of procedure, severity of patient's condition, physical and mental effort required). note: this modifier should not be appended to an e/m service.
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.
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).
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
CR Catastrophe/disaster related
ET Emergency services
Q1 Routine clinical service provided in a clinical research study that is in an approved clinical research study
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