CPT 33612 Intraventricular Tunnel Graft Reimbursement | OpenPayer

Summary & Overview

CPT 33612: Intraventricular Tunnel Graft for VSD with Outflow Tract Repair

CPT code 33612 captures a specialized open cardiac surgical repair in which an intraventricular tunnel graft is placed from the aorta to a ventricular septal defect (VSD) to reroute blood flow; if the graft obstructs the ventricular outflow tract, an additional patch graft repair of the outflow tract is performed. This code represents a complex operative intervention primarily used in congenital or structural cardiac cases where intracardiac routing is required. Nationally, the procedure is significant because it affects resource use in tertiary centers, perioperative risk stratification, and payer coverage for high-complexity cardiac surgery.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for when 33612 is used, typical sites of service, and what to expect in terms of the procedure's scope. The publication summarizes common modifiers and administrative considerations (Data not available in the input for payer-specific rates), and highlights benchmarking and policy-relevant themes such as inpatient surgical setting, complexity of congenital cardiac repairs, and implications for coding accuracy and claims processing.

The article is organized to provide benchmarks, coding guidance context, and policy notes that help billing managers, coding professionals, and clinical leaders understand where 33612 fits within cardiac surgical service lines and payer coverage frameworks.

AetnaBlue Cross Blue ShieldCignaUnitedHealthcareMedicare33612CPTcardiac surgeryventricular septal defectintraventricular tunnel graftcongenital heart surgeryinpatient surgery

Billing Code Overview

CPT code 33612 describes a cardiac surgical procedure in which the provider places an intraventricular tunnel graft from the aorta to a ventricular septal defect (VSD) to reroute blood flow. If the placed tunnel graft obstructs blood flow through the ventricular outflow tract, the surgeon repairs the outflow tract with a patch graft as part of the same operative intervention.

Service Type: Open cardiac surgical repair of ventricular septal defect with intraventricular tunnel graft and potential outflow tract patching

Typical Site of Service: Inpatient hospital operating room or cardiac surgery suite, performed by cardiothoracic or congenital heart surgeons during corrective cardiac surgery.

Clinical & Coding Specifications

Clinical Context

A 6-month-old infant with a large perimembranous ventricular septal defect (VSD) and subaortic obstruction is evaluated for definitive surgical repair. Diagnostic workup includes transthoracic echocardiography demonstrating significant left-to-right shunt with ventricular septal defect anatomy amenable to an intraventricular tunnel (aortic-to-VSD) rerouting procedure. The infant is scheduled for open median sternotomy, cardiopulmonary bypass, and placement of an intraventricular tunnel graft from the aorta to the VSD (CPT 33612). Intraoperative assessment reveals partial obstruction of the right ventricular outflow tract by the tunnel, prompting concomitant repair of the outflow tract with a patch graft.

Perioperative workflow: preoperative anesthesia evaluation and consent; preoperative imaging review; induction of general anesthesia with endotracheal intubation; median sternotomy and institution of cardiopulmonary bypass; cardioplegic arrest; creation and placement of the intraventricular tunnel graft and patching of the outflow tract as needed; intraoperative transesophageal echocardiography to confirm repair integrity and absence of residual obstruction; separation from bypass, chest closure, and transfer to pediatric cardiac ICU for postoperative monitoring and recovery.

Coding Specifications

Modifier	Description	When to Use
`00`	No modifier (standard)

CPT 33602: Repair of Aortic or Pulmonary Semilunar Valve Regurgitation

CPT-33621-THORACIC-ENDOVASCULAR-STENT-PLACEMENT

CPT 33621: Thoracic Endovascular Stent Placement

CPT-33619-NORWOOD-PROCEDURE-HLHS-AORTIC-ARCH-RECONSTRUCTION

CPT 33619: Norwood Procedure for HLHS and Aortic Arch Reconstruction

CPT-33610-VENTRICULAR-SEPTAL-DEFECT-ENLARGEMENT-VALVED-DEVICE

CPT 33610: Ventricular Septal Defect Enlargement with Valved Device

CPT-33620-PULMONARY-ARTERY-BANDING-BILATERAL

CPT 33620: Bilateral Pulmonary Artery Banding to Reduce Left-to-Right Shunt

CPT-33606-DOUBLE-INLET-VENTRICLE-PULMONARY-ARTERY-TO-AORTA-JOIN

CPT 33606: Pulmonary Artery to Aorta Join for Double Inlet Ventricle

CPT-33615-ATRIAL-SEPTAL-DEFECT-PATCH-AND-PULMONARY-ARTERY-ANASTOMOSIS

CPT 33615: Atrial Septal Defect Patch and Pulmonary Artery Anastomosis

CPT-33617-SUPERIOR-VENA-CAVA-TO-PULMONARY-ARTERY-CONNECTION

CPT 33617: Superior Vena Cava to Pulmonary Artery Connection

CPT-33608-VENTRICLE-TO-PULMONARY-ARTERY-CONDUIT-REPAIR

CPT 33608: Ventricle-to-Pulmonary Artery Conduit or Graft Repair

CPT-33611-VENTRICULAR-SEPTAL-DEFECT-TUNNEL-GRAFT-TO-AORTA

CPT 33611: Tunnel Graft from VSD to Aorta

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Taxonomy Code	Specialty	Notes
2080P0206X	Pediatric Cardiac Surgery	Primary specialty performing `CPT 33612` in infants and children.
2080S0122X	Thoracic Surgery	Thoracic/cardiac surgeons who perform complex intracardiac repairs.
207RP1001X	Pediatric Cardiology	Pediatric cardiologists involved in diagnosis, perioperative planning, and intraoperative echocardiography guidance.
207L00000X	Cardiac Surgery (General)	Adult congenital or cardiac surgeons who may perform repairs in adolescents or adults with residual VSDs.
207K00000X	Cardiology	Anesthesia and critical care teams coordinate perioperative cardiac care (listed here for multidisciplinary involvement).

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`Q21.0`	Ventricular septal defect	Primary congenital defect mandating closure or rerouting such as with an intraventricular tunnel graft.
`Q25.4`	Other congenital malformations of ventricular outflow tract	Relevant when the outflow tract anatomy is abnormal and requires patch repair during `CPT 33612`.
`I35.0`	Nonrheumatic aortic (valve) stenosis	May coexist in older patients with outflow obstruction considerations during tunneled repairs.
`I34.1`	Nonrheumatic mitral (valve) insufficiency	Possible associated lesions in complex congenital heart disease requiring comprehensive surgical planning.
`Q20.0`	Common truncus arteriosus	Complex conotruncal defects may require intraventricular routing procedures in variant anatomy.
`Q21.2`	Atrioventricular septal defect	Associated septal defects that can coexist and alter surgical approach to VSD repair.
`P29.2`	Persistent pulmonary hypertension of newborn (PPHN)	Hemodynamic instability related to large left-to-right shunts may be present perioperatively in neonates.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`33405`	Repair of isolated ventricular septal defect with cardiopulmonary bypass	Alternative or adjunct open VSD repair technique; may be billed when standard patch repair is performed rather than an intraventricular tunnel graft.
`93312`	Transesophageal echocardiography, intraoperative, real-time with image documentation	Used intraoperatively to evaluate VSD closure integrity and outflow tract obstruction during `CPT 33612`.
`33999`	Unlisted thoracic procedure	Used when a specific component of the operative repair is not described by an existing code and payer requires an unlisted code with operative report.
`00530`	Anesthesia for procedures on heart and pericardial sac	Anesthesia coding for open cardiac procedures including `CPT 33612`.
`33426`	Reconstruction of right ventricular outflow tract with a patch (without valvotomy)	Used when the outflow tract is repaired with a patch graft as part of the tunnel-related obstruction correction during `CPT 33612`.

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