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Official Description

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)

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

Operative tissue ablation and reconstruction of the atria, as described by CPT® Code 33258, refers to a specialized surgical procedure aimed at correcting chronic atrial fibrillation, which is characterized by rapid and uncoordinated contractions of the upper chambers of the heart, leading to an irregular and often rapid heartbeat. This extensive procedure is typically performed during another cardiac operation, such as a maze procedure, which is designed to create new electrical pathways in the heart. These pathways help to interrupt the abnormal electrical signals that cause atrial fibrillation, thereby restoring normal heart rhythm. The procedure is conducted without the use of cardiopulmonary bypass, distinguishing it from similar procedures that may require this support. The maze procedure involves making precise incisions in the atrial tissue to prevent the conduction of errant electrical impulses, allowing for the restoration of normal electrical activity from the sinoatrial node to the atrioventricular node. This surgical intervention not only aims to restore normal contractions of the atria but also to improve their size and function, enabling them to effectively pump blood into the ventricles. The careful execution of this procedure is critical for achieving the desired outcomes in patients suffering from atrial fibrillation.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure described by CPT® Code 33258 is indicated for patients suffering from chronic atrial fibrillation, which is characterized by rapid and uncoordinated contractions of the atria. This condition can lead to various complications, including an irregular and often rapid heartbeat. The maze procedure, which involves extensive operative tissue ablation and reconstruction of the atria, is performed to correct this arrhythmia and restore normal heart function. The procedure is typically indicated when other treatment options have been considered or when it is performed concurrently with another cardiac procedure.

  • Chronic Atrial Fibrillation - A condition marked by rapid and uncoordinated muscle contractions of the atria, leading to irregular heartbeats.
  • Concurrent Cardiac Procedures - The maze procedure is often performed at the same time as other cardiac surgeries, necessitating the need for this specific ablation and reconstruction.

2. Procedure

The procedure involves several critical steps to ensure effective ablation and reconstruction of the atria.

  • Step 1: Preparation and Anesthesia - The patient is prepared for surgery, and general anesthesia is administered to ensure comfort and immobility during the procedure.
  • Step 2: Accessing the Heart - The surgical team gains access to the heart, typically through an incision in the chest, allowing for direct visualization and manipulation of cardiac structures.
  • Step 3: Incision and Exposure - A sling is placed around the inferior vena cava to lift and turn the heart, providing better exposure for the surgical team. The left atrium is then incised through the interatrial groove.
  • Step 4: Atrial Appendage Excision - The atrial appendage is excised to eliminate a potential source of thrombus formation and to facilitate the subsequent steps of the procedure.
  • Step 5: Atrial Incisions - Precise incisions are made in the atrial tissue to interrupt the conduction of abnormal electrical impulses. This is a critical step in creating new pathways for normal electrical conduction.
  • Step 6: Suture Closure - After the necessary incisions are made, the incision sites are sutured closed. A pericardial strip may be used for reinforcement of the suture lines to ensure stability and healing.
  • Step 7: Restoration of Function - The goal of the procedure is to allow the atria to hold and pump blood effectively while preventing electrical impulses from crossing the incisions, thereby eliminating fibrillation.

3. Post-Procedure

After the procedure, patients are typically monitored in a recovery area to assess their vital signs and overall condition. Post-operative care may include pain management, monitoring for any complications, and ensuring that the heart is functioning properly. Patients may require follow-up visits to evaluate the success of the procedure and to monitor for any recurrence of atrial fibrillation. Rehabilitation and lifestyle modifications may also be recommended to support heart health and prevent future episodes of arrhythmia.

Short Descr ABLATE ATRIA X10SV ADD-ON
Medium Descr ATRIA ABLTJ & RCNSTJ W/OTHER PX EXTENSIV W/O BYP
Long Descr 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)
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) 0 - Co-surgeons not permitted for this procedure.
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) P2B - Major procedure, cardiovascular-Aneurysm repair
MUE 1
CCS Clinical Classification 49 - Other OR heart procedures

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

33130 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Illustration for Code Resection of external cardiac tumor
33250 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Operative ablation of supraventricular arrhythmogenic focus or pathway (eg, Wolff-Parkinson-White, atrioventricular node re-entry), tract(s) and/or focus (foci); without cardiopulmonary bypass
33300 MPFS Status: Active Code APC C Physician Quality Reporting Illustration for Code Repair of cardiac wound; without bypass
33310 MPFS Status: Active Code APC C Physician Quality Reporting Illustration for Code Cardiotomy, exploratory (includes removal of foreign body, atrial or ventricular thrombus); without bypass
33320 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Illustration for Code Suture repair of aorta or great vessels; without shunt or cardiopulmonary bypass
33321 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Illustration for Code Suture repair of aorta or great vessels; with shunt bypass
33330 MPFS Status: Active Code APC C CPT Assistant Article Illustration for Code Insertion of graft, aorta or great vessels; without shunt, or cardiopulmonary bypass
33365 MPFS Status: Active Code APC C Transcatheter aortic valve replacement (TAVR/TAVI) with prosthetic valve; transaortic approach (eg, median sternotomy, mediastinotomy)
33420 MPFS Status: Active Code APC C Illustration for Code Valvotomy, mitral valve; closed heart
33501 MPFS Status: Active Code APC C CPT Assistant Article Illustration for Code Repair of coronary arteriovenous or arteriocardiac chamber fistula; without cardiopulmonary bypass
33502 Modifier 63 Exempt MPFS Status: Active Code APC C CPT Assistant Article Illustration for Code Repair of anomalous coronary artery from pulmonary artery origin; by ligation
33503 Modifier 63 Exempt MPFS Status: Active Code APC C Illustration for Code Repair of anomalous coronary artery from pulmonary artery origin; by graft, without cardiopulmonary bypass
33510 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Illustration for Code Coronary artery bypass, vein only; single coronary venous graft
33511 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Illustration for Code Coronary artery bypass, vein only; 2 coronary venous grafts
33512 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Illustration for Code Coronary artery bypass, vein only; 3 coronary venous grafts
33513 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Illustration for Code Coronary artery bypass, vein only; 4 coronary venous grafts
33514 MPFS Status: Active Code APC C Physician Quality Reporting Illustration for Code Coronary artery bypass, vein only; 5 coronary venous grafts
33516 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Illustration for Code Coronary artery bypass, vein only; 6 or more coronary venous grafts
33533 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Coronary artery bypass, using arterial graft(s); single arterial graft
33534 MPFS Status: Active Code APC C Physician Quality Reporting Coronary artery bypass, using arterial graft(s); 2 coronary arterial grafts
33535 MPFS Status: Active Code APC C Physician Quality Reporting Coronary artery bypass, using arterial graft(s); 3 coronary arterial grafts
33536 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Coronary artery bypass, using arterial graft(s); 4 or more coronary arterial grafts
33690 Modifier 63 Exempt MPFS Status: Active Code APC C Illustration for Code Banding of pulmonary artery
33735 Modifier 63 Exempt MPFS Status: Active Code APC C CPT Assistant Article Illustration for Code Atrial septectomy or septostomy; closed heart (Blalock-Hanlon type operation)
33750 Modifier 63 Exempt MPFS Status: Active Code APC C Illustration for Code Shunt; subclavian to pulmonary artery (Blalock-Taussig type operation)
33755 Modifier 63 Exempt MPFS Status: Active Code APC C Illustration for Code Shunt; ascending aorta to pulmonary artery (Waterston type operation)
33762 Modifier 63 Exempt MPFS Status: Active Code APC C Illustration for Code Shunt; descending aorta to pulmonary artery (Potts-Smith type operation)
33764 MPFS Status: Active Code APC C Illustration for Code Shunt; central, with prosthetic graft
33766 MPFS Status: Active Code APC C CPT Assistant Article Illustration for Code Shunt; superior vena cava to pulmonary artery for flow to 1 lung (classical Glenn procedure)
33800 MPFS Status: Active Code APC C Aortic suspension (aortopexy) for tracheal decompression (eg, for tracheomalacia) (separate procedure)
33802 Changed Code for 2025 MPFS Status: Active Code APC C Division of aberrant vessel (vascular ring);
33803 MPFS Status: Active Code APC C Division of aberrant vessel (vascular ring); with reanastomosis
33820 MPFS Status: Active Code APC C Repair of patent ductus arteriosus; by ligation
33822 Age Edit MPFS Status: Active Code APC C Repair of patent ductus arteriosus; by division, younger than 18 years
33824 Age Edit MPFS Status: Active Code APC C Repair of patent ductus arteriosus; by division, 18 years and older
33840 MPFS Status: Active Code APC C Excision of coarctation of aorta, with or without associated patent ductus arteriosus; with direct anastomosis
33845 MPFS Status: Active Code APC C Excision of coarctation of aorta, with or without associated patent ductus arteriosus; with graft
33851 MPFS Status: Active Code APC C Excision of coarctation of aorta, with or without associated patent ductus arteriosus; repair using either left subclavian artery or prosthetic material as gusset for enlargement
33852 MPFS Status: Active Code APC C CPT Assistant Article Repair of hypoplastic or interrupted aortic arch using autogenous or prosthetic material; without cardiopulmonary bypass
33875 MPFS Status: Active Code APC C Descending thoracic aorta graft, with or without bypass
33877 MPFS Status: Active Code APC C Physician Quality Reporting Repair of thoracoabdominal aortic aneurysm with graft, with or without cardiopulmonary bypass
33915 MPFS Status: Active Code APC C PUB 100 Pulmonary artery embolectomy; without cardiopulmonary bypass
33925 MPFS Status: Active Code APC C Repair of pulmonary artery arborization anomalies by unifocalization; without cardiopulmonary bypass
33981 MPFS Status: Active Code APC C CPT Assistant Article Illustration for Code Replacement of extracorporeal ventricular assist device, single or biventricular, pump(s), single or each pump
33982 MPFS Status: Active Code APC C CPT Assistant Article Illustration for Code Replacement of ventricular assist device pump(s); implantable intracorporeal, single ventricle, without cardiopulmonary bypass
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
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).
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
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
Date
Action
Notes
2017-01-01 Changed Guidelines changed.
2013-01-01 Changed Medium Descriptor changed.
2011-01-01 Changed Short description changed.
2008-01-01 Added First appearance in code book in 2008.
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