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Official Description

Cardiotomy, exploratory (includes removal of foreign body, atrial or ventricular thrombus); with cardiopulmonary bypass

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

An exploratory cardiotomy, as defined by CPT® Code 33315, is a surgical procedure that involves making an incision in the heart to investigate and address specific issues within its chambers. This procedure is particularly focused on the removal of any foreign bodies or thrombi (blood clots) that may be present in the atria or ventricles of the heart. The term 'cardiotomy' refers to the surgical opening of the heart, and it can also be described using the terms 'exploratory atriotomy' for the atrial chambers or 'ventriculotomy' for the ventricular chambers. The procedure typically begins with a midline sternotomy, which is an incision made through the sternum to provide access to the heart. In cases where cardiopulmonary bypass is necessary, the aorta is cannulated, and the superior and inferior vena cava are also accessed to facilitate the bypass. This allows for the heart to be temporarily stopped, enabling the surgeon to safely inspect the heart chambers. Once the heart wall is incised, the interior of the affected chamber is examined, and any identified foreign bodies or thrombi are carefully removed. After the necessary interventions, the incisions in the heart wall are closed, and if cardiopulmonary bypass was utilized, it is subsequently terminated. The procedure concludes with the placement of chest tubes as required and the closure of the chest wall incision. It is important to note that CPT® Code 33315 is specifically used when cardiopulmonary bypass is involved, while code 33310 is designated for exploratory cardiotomy performed without the use of cardiopulmonary bypass.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The exploratory cardiotomy procedure, coded as CPT® 33315, is indicated for various clinical scenarios where intervention within the heart chambers is necessary. The following conditions may warrant this procedure:

  • Presence of Foreign Body The procedure is indicated when a foreign object is detected within the heart, which may pose a risk to cardiac function or overall health.
  • Atrial or Ventricular Thrombus The presence of a thrombus in either the atrial or ventricular chambers necessitates removal to prevent complications such as embolism or impaired cardiac output.

2. Procedure

The exploratory cardiotomy procedure involves several critical steps to ensure effective access and intervention within the heart. The following procedural steps are outlined:

  • Step 1: Midline Sternotomy The procedure begins with a midline sternotomy, where an incision is made through the sternum to provide direct access to the thoracic cavity and the heart. This approach allows the surgeon to visualize and operate on the heart effectively.
  • Step 2: Cannulation for Cardiopulmonary Bypass If cardiopulmonary bypass is required, the surgeon cannulates the aorta and the superior and inferior vena cava. This step is crucial as it diverts blood flow away from the heart, allowing for a bloodless surgical field and enabling the heart to be temporarily stopped.
  • Step 3: Initiation of Cardioplegic Arrest Once the cannulation is complete, cardioplegic arrest is initiated. This involves administering a solution that temporarily halts the heart's activity, providing a still environment for the surgeon to work.
  • Step 4: Incision of the Heart Wall The surgeon then makes an incision in the heart wall, either through an atriotomy or ventriculotomy, depending on the chamber being accessed. This incision allows for direct inspection of the interior of the heart chamber.
  • Step 5: Inspection and Removal of Foreign Body or Thrombus The interior of the affected heart chamber is carefully inspected for any foreign bodies or thrombi. If any are found, they are meticulously removed to restore normal function and prevent further complications.
  • Step 6: Closure of Heart Wall Incisions After the necessary interventions are completed, the incisions made in the heart wall are closed securely to restore the integrity of the heart structure.
  • Step 7: Termination of Cardiopulmonary Bypass If cardiopulmonary bypass was utilized, it is now terminated, allowing blood flow to resume through the heart.
  • Step 8: Placement of Chest Tubes and Closure of Chest Wall Incision Finally, chest tubes may be placed as needed to facilitate drainage, and the chest wall incision is closed to complete the procedure.

3. Post-Procedure

Post-procedure care following an exploratory cardiotomy with cardiopulmonary bypass involves monitoring the patient for any complications that may arise from the surgery. Patients are typically observed in a recovery area or intensive care unit where vital signs are closely monitored. The presence of chest tubes may require careful management to ensure proper drainage and prevent fluid accumulation. Patients may experience pain and discomfort, which can be managed with appropriate analgesics. The recovery period may vary depending on the individual patient's condition and the extent of the procedure performed. Follow-up care is essential to assess the healing process and to monitor for any signs of complications, such as infection or cardiac dysfunction.

Short Descr EXPLORATORY HEART SURGERY
Medium Descr CARDIOT EXPL RMVL FB ATR/VENTR THRMB CARD BYP
Long Descr Cardiotomy, exploratory (includes removal of foreign body, atrial or ventricular thrombus); with 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) 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) P2F - Major procedure, cardiovascular-Other
MUE 1
CCS Clinical Classification 49 - Other OR heart procedures

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)
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)
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.
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).
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.)
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.)
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
GC This service has been performed in part by a resident under the direction of a teaching physician
GV Attending physician not employed or paid under arrangement by the patient's hospice provider
XE Separate encounter, a service that is distinct because it occurred during a separate encounter
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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2004-01-01 Changed Code description changed.
Pre-1990 Added Code added.
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