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Official Description

Ascending aorta graft, with cardiopulmonary bypass, includes valve suspension, when performed; for aortic disease other than dissection (eg, aneurysm)

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The CPT® Code 33859 refers to a surgical procedure involving the repair of the ascending aorta using a graft, which is performed with the assistance of cardiopulmonary bypass. This procedure is specifically indicated for patients suffering from aortic disease, excluding dissection, such as an aortic aneurysm. The ascending aorta is a critical part of the heart's anatomy, responsible for carrying oxygenated blood from the heart to the rest of the body. In cases where the aorta is weakened or dilated, as seen in aneurysms, surgical intervention is necessary to prevent life-threatening complications. The procedure typically involves a median sternotomy, which is an incision made along the sternum to provide access to the heart and aorta. During the operation, cardiopulmonary bypass is initiated to take over the function of the heart and lungs, allowing the surgeon to operate on a still and bloodless field. The procedure may also include valve suspension if deemed necessary, ensuring that the aortic valve functions properly post-surgery. This comprehensive approach aims to restore normal blood flow and prevent further complications associated with aortic disease.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure described by CPT® Code 33859 is indicated for the following conditions:

  • Aortic Disease This includes conditions affecting the ascending aorta, specifically aneurysms that require surgical intervention to prevent rupture or other complications.

2. Procedure

The surgical procedure for CPT® Code 33859 involves several critical steps to ensure the successful repair of the ascending aorta:

  • Step 1: Median Sternotomy The procedure begins with a median sternotomy, where an incision is made along the sternum to provide direct access to the heart and ascending aorta. This approach allows the surgeon to visualize and operate on the affected area effectively.
  • Step 2: Initiation of Cardiopulmonary Bypass Once access is obtained, cardiopulmonary bypass is initiated. This involves connecting the patient to a heart-lung machine that takes over the functions of the heart and lungs, allowing the surgical team to work on a still and bloodless field.
  • Step 3: Cross-Clamping the Ascending Aorta The ascending aorta is then cross-clamped to stop blood flow, which is essential for safely performing the repair. This step is critical to prevent blood loss and maintain a clear surgical field.
  • Step 4: Transection of the Ascending Aorta Following the establishment of cardioplegic arrest, the ascending aorta is transected above the cross-clamp. This step allows for the removal of the diseased section of the aorta.
  • Step 5: Graft Placement Sub-annular stitches are passed through the graft and tied to secure it to the aortic annulus. This ensures that the graft is firmly attached and will function properly once blood flow is restored.
  • Step 6: Sizing the Aortic Annulus A Hagar's dilator is used to size the aortic annulus accurately. This step is crucial for ensuring that the graft fits properly and functions as intended.
  • Step 7: Valve Evaluation and Suspension The aortic valve is evaluated for any issues. If valve suspension is necessary, the three commissures of the valve are suspended. Careful attention is paid to the height and distance between each suspension to avoid distortion of the valve leaflet positioning.
  • Step 8: Testing Valve Function After the valve suspension, the valve is tested to confirm proper function, ensuring that it will operate effectively once the procedure is complete.
  • Step 9: Sewing the Distal Graft The distal portion of the graft is sewn to the remaining normal ascending aorta, completing the connection and allowing for normal blood flow through the graft.
  • Step 10: Reperfusion and Closure Air is evacuated from the heart, the clamp is removed, and the heart is reperfused. Temporary pacing wires are placed, and pacing is initiated if needed. Cardiopulmonary bypass is then terminated, all cannulas are removed, drains are placed, and the chest is closed.

3. Post-Procedure

Post-procedure care following the ascending aorta graft surgery includes monitoring the patient for any complications, ensuring proper heart function, and managing pain. Patients may require intensive care unit (ICU) monitoring initially to observe for any signs of bleeding, infection, or graft failure. Recovery may involve gradual mobilization and rehabilitation to restore normal function. Follow-up appointments are essential to assess the success of the procedure and the condition of the aorta and valve.

Short Descr AS-AORT GRF F/DS OTH/THN DSJ
Medium Descr AS-AORT GRF W/CARD BYP F/AORTIC DS OTH/THN DSJ
Long Descr Ascending aorta graft, with cardiopulmonary bypass, includes valve suspension, when performed; for aortic disease other than dissection (eg, aneurysm)
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) 1 - Co-surgeons could be paid, though supporting documentation is required...
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) none
MUE 1

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)
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)
33866 Add-on Code MPFS Status: Active Code APC N ASC N1 Aortic hemiarch graft including isolation and control of the arch vessels, beveled open distal aortic anastomosis extending under one or more of the arch vessels, and total circulatory arrest or isolated cerebral perfusion (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)
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
GC This service has been performed in part by a resident under the direction of a teaching physician
51 Multiple procedures: when multiple procedures, other than e/m services, physical medicine and rehabilitation services or provision of supplies (eg, vaccines), are performed at the same session by the same individual, the primary procedure or service may be reported as listed. the additional procedure(s) or service(s) may be identified by appending modifier 51 to the additional procedure or service code(s). note: this modifier should not be appended to designated "add-on" codes (see appendix d).
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).
80 Assistant surgeon: surgical assistant services may be identified by adding modifier 80 to the usual procedure number(s).
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.
52 Reduced services: under certain circumstances a service or procedure is partially reduced or eliminated at the discretion of the physician or other qualified health care professional. under these circumstances the service provided can be identified by its usual procedure number and the addition of modifier 52, signifying that the service is reduced. this provides a means of reporting reduced services without disturbing the identification of the basic service. note: for hospital outpatient reporting of a previously scheduled procedure/service that is partially reduced or cancelled as a result of extenuating circumstances or those that threaten the well-being of the patient prior to or after administration of anesthesia, see modifiers 73 and 74 (see modifiers approved for asc hospital outpatient use).
53 Discontinued procedure: under certain circumstances, the physician or other qualified health care professional may elect to terminate a surgical or diagnostic procedure. due to extenuating circumstances or those that threaten the well being of the patient, it may be necessary to indicate that a surgical or diagnostic procedure was started but discontinued. this circumstance may be reported by adding modifier 53 to the code reported by the individual for the discontinued procedure. note: this modifier is not used to report the elective cancellation of a procedure prior to the patient's anesthesia induction and/or surgical preparation in the operating suite. for outpatient hospital/ambulatory surgery center (asc) reporting of a previously scheduled procedure/service that is partially reduced or cancelled as a result of extenuating circumstances or those that threaten the well being of the patient prior to or after administration of anesthesia, see modifiers 73 and 74 (see modifiers approved for asc hospital outpatient use).
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.
76 Repeat procedure or service by same physician or other qualified health care professional: it may be necessary to indicate that a procedure or service was repeated by the same physician or other qualified health care professional subsequent to the original procedure or service. this circumstance may be reported by adding modifier 76 to the repeated procedure or service. note: this modifier should not be appended to an e/m service.
77 Repeat procedure by another physician or other qualified health care professional: it may be necessary to indicate that a basic procedure or service was repeated by another physician or other qualified health care professional subsequent to the original procedure or service. this circumstance may be reported by adding modifier 77 to the repeated procedure or service. note: this modifier should not be appended to an e/m service.
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.)
79 Unrelated procedure or service by the same physician or other qualified health care professional during the postoperative period: the individual may need to indicate that the performance of a procedure or service during the postoperative period was unrelated to the original procedure. this circumstance may be reported by using modifier 79. (for repeat procedures on the same day, see modifier 76.)
81 Minimum assistant surgeon: minimum surgical assistant services are identified by adding modifier 81 to the usual procedure number.
AG Primary physician
AQ Physician providing a service in an unlisted health professional shortage area (hpsa)
CC Procedure code change (use 'cc' when the procedure code submitted was changed either for administrative reasons or because an incorrect code was filed)
CR Catastrophe/disaster related
ET Emergency services
GW Service not related to the hospice patient's terminal condition
Q0 Investigational clinical service provided in a clinical research study that is in an approved clinical research study
Q1 Routine clinical service provided in a clinical research study that is in an approved clinical research study
Q6 Service furnished under a fee-for-time compensation arrangement by a substitute physician or by a substitute physical therapist furnishing outpatient physical therapy services in a health professional shortage area, a medically underserved area, or a rural area
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
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2020-01-01 Added Code added.
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