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Official Description

Transcatheter atrial septostomy (TAS) for congenital cardiac anomalies to create effective atrial flow, including all imaging guidance by the proceduralist, when performed, any method (eg, Rashkind, Sang-Park, balloon, cutting balloon, blade)

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

Transcatheter atrial septostomy (TAS) is a specialized medical procedure primarily performed on very young infants to address congenital heart diseases characterized by a small and restrictive atrial communication. This procedure is particularly common in cases of transposition of the great arteries, a serious condition that requires prompt intervention. TAS is typically executed as an emergent procedure shortly after birth, with the primary goal of decompressing the left atrium and enhancing the flow of blood between the atria. The procedure can be performed using various techniques, including the use of low profile balloons, static balloons, cutting balloons, or blades, depending on the specific requirements of the case. The procedure is generally conducted in a controlled environment such as a catheterization laboratory (cath lab) or an intensive care unit (ICU), where imaging guidance, such as angiography or echocardiography, is utilized to ensure precision and safety. The use of imaging is crucial for the proceduralist to navigate the complex anatomy of the heart and to monitor the effectiveness of the intervention while minimizing the risk of complications.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

Transcatheter atrial septostomy (TAS) is indicated for specific congenital cardiac anomalies that result in inadequate atrial blood flow. The following conditions are commonly associated with the need for this procedure:

  • Transposition of the Great Arteries - A congenital heart defect where the two main arteries leaving the heart are reversed, leading to poor oxygenation of blood.
  • Restrictive Atrial Communication - Conditions where the atrial septum is too thick or restrictive, preventing adequate blood flow between the left and right atria.
  • Congenital Heart Diseases - Various other congenital anomalies that may necessitate the creation of effective atrial flow to improve overall cardiac function.

2. Procedure

The transcatheter atrial septostomy (TAS) procedure involves several critical steps to ensure successful intervention. The following outlines the procedural steps:

  • Step 1: Accessing the Femoral Vein - The procedure begins with the administration of heparin to prevent clotting. The femoral vein is accessed percutaneously, allowing for the introduction of the necessary catheters into the vascular system.
  • Step 2: Catheter Navigation - A balloon-tipped catheter is carefully threaded from the femoral vein into the inferior vena cava and subsequently into the right atrium. This step is crucial for positioning the catheter correctly to address the atrial communication.
  • Step 3: Identifying the Atrial Communication - Once in the right atrium, the restricted atrial communication is identified. The catheter is then advanced into the left atrium to prepare for the septostomy.
  • Step 4: Balloon Inflation - The balloon is inflated at the site of the atrial communication. The position of the balloon is verified through imaging guidance to ensure it is correctly placed.
  • Step 5: Balloon Deflation and Movement - After confirming the balloon's position, it is quickly passed back into the right atrium and deflated. This step may be repeated multiple times, with the balloon volume gradually increased to effectively enlarge the atrial communication.
  • Step 6: Alternative Techniques - In addition to balloon dilation, alternative methods such as using a cutting balloon or a blade technique may be employed to achieve the desired outcome until adequate intra-atrial blood flow is confirmed.
  • Step 7: Post-Procedure Imaging - Following the procedure, echocardiography is utilized to check for any complications, such as pericardial fluid accumulation or damage to the heart, and to verify the dimensions of the interatrial communication.

3. Post-Procedure

After the transcatheter atrial septostomy (TAS) procedure, careful monitoring is essential to ensure the patient's stability and to identify any potential complications. The patient is typically observed in a controlled environment, such as an intensive care unit (ICU), where vital signs and cardiac function can be closely monitored. The expected recovery period may vary depending on the individual patient's condition and response to the procedure. Follow-up imaging, such as echocardiography, is often performed to assess the success of the septostomy and to ensure that there are no adverse effects, such as fluid accumulation around the heart or other complications. The healthcare team will provide specific post-procedure care instructions and may schedule additional follow-up appointments to monitor the patient's progress and overall cardiac health.

Short Descr TAS CONGENITAL CAR ANOMAL
Medium Descr TAS CONGENITAL CARDIAC ANOMALIES ANY METHOD
Long Descr Transcatheter atrial septostomy (TAS) for congenital cardiac anomalies to create effective atrial flow, including all imaging guidance by the proceduralist, when performed, any method (eg, Rashkind, Sang-Park, balloon, cutting balloon, blade)
Status Code Active Code
Global Days 000 - Endoscopic or Minor Procedure
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) 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) 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)
33924 Addon Code MPFS Status: Active Code APC C CPT Assistant Article Ligation and takedown of a systemic-to-pulmonary artery shunt, performed in conjunction with a congenital heart procedure (List separately in addition to code for primary procedure)
93563 Addon Code MPFS Status: Active Code APC N Injection procedure during cardiac catheterization including imaging supervision, interpretation, and report; for selective coronary angiography during congenital heart catheterization (List separately in addition to code for primary procedure)
93565 Add-on Code MPFS Status: Active Code APC N Injection procedure during cardiac catheterization including imaging supervision, interpretation, and report; for selective left ventricular or left atrial angiography (List separately in addition to code for primary procedure)
93566 Addon Code MPFS Status: Active Code APC N ASC N1 Injection procedure during cardiac catheterization including imaging supervision, interpretation, and report; for selective right ventricular or right atrial angiography (List separately in addition to code for primary procedure)
93567 Addon Code MPFS Status: Active Code APC N ASC N1 Injection procedure during cardiac catheterization including imaging supervision, interpretation, and report; for supravalvular aortography (List separately in addition to code for primary procedure)
93568 Addon Code MPFS Status: Active Code APC N ASC N1 Injection procedure during cardiac catheterization including imaging supervision, interpretation, and report; for nonselective pulmonary arterial angiography (List separately in addition to code for primary procedure)
93569 Add-on Code MPFS Status: Active Code APC N Injection procedure during cardiac catheterization including imaging supervision, interpretation, and report; for selective pulmonary arterial angiography, unilateral (List separately in addition to code for primary procedure)
93573 Add-on Code Resequenced Code MPFS Status: Active Code APC N Injection procedure during cardiac catheterization including imaging supervision, interpretation, and report; for selective pulmonary arterial angiography, bilateral (List separately in addition to code for primary procedure)
93574 Add-on Code Resequenced Code MPFS Status: Active Code APC N Injection procedure during cardiac catheterization including imaging supervision, interpretation, and report; for selective pulmonary venous angiography of each distinct pulmonary vein during cardiac catheterization (List separately in addition to code for primary procedure)
93575 Add-on Code Resequenced Code MPFS Status: Active Code APC N Injection procedure during cardiac catheterization including imaging supervision, interpretation, and report; for selective pulmonary angiography of major aortopulmonary collateral arteries (MAPCAs) arising off the aorta or its systemic branches, during cardiac catheterization for congenital heart defects, each distinct vessel (List separately in addition to code for primary procedure)
93662 Addon Code MPFS Status: Carrier Priced APC N PUB 100 CPT Assistant Article Intracardiac echocardiography during therapeutic/diagnostic intervention, including imaging supervision and interpretation (List separately in addition to code for primary procedure)
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
Q0 Investigational clinical service provided in a clinical research study that is in an approved clinical research study
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
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2021-01-01 Added Code added.
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