Summary & Overview

CPT 33955: Central Cannula Insertion for Pediatric Extracorporeal Circulation

CPT code 33955 defines open insertion of a central cannula via sternotomy or thoracotomy for extracorporeal circulation in children from birth through five years. This pediatric cardiothoracic surgical code is critical for billing and clinical documentation when establishing cardiopulmonary bypass in very young patients. Nationally, accurate use of this code affects hospital and surgeon reporting, claims adjudication, and aggregate pediatric cardiac procedural volumes.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical context for the procedure, typical settings where the service occurs, and the common modifiers associated with surgical coding. The publication summarizes benchmarks and coding practice considerations relevant to hospitals and surgical teams, highlights documentation elements tied to pediatric cardiopulmonary bypass, and outlines areas where policy updates or payer edits commonly affect payment. Data not available in the input for specific payer fee schedules, associated taxonomies, and ICD-10 diagnosis pairings are omitted.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareCPT 33955pediatric cardiac surgeryextracorporeal circulationcentral cannula insertionsternotomythoracotomyoperating roomsurgical coding

Billing Code Overview

CPT code 33955 describes insertion of a central cannula through an open approach (sternotomy or thoracotomy) for extracorporeal circulation in a child from birth through five years of age. This service is an operative procedure performed to establish central cannulation for cardiopulmonary bypass in pediatric cardiac surgery.

Service type: Surgical insertion of central cannula for extracorporeal circulation
Typical site of service: Inpatient operating room (sternotomy or thoracotomy) for pediatric cardiac surgery

Clinical & Coding Specifications

Clinical Context

A 6-month-old infant with complex congenital heart disease (for example, hypoplastic left heart syndrome) is taken to the operating room for surgical repair via median sternotomy. During the procedure the surgical team establishes extracorporeal circulation for cardiopulmonary bypass by inserting a central arterial and/or venous cannula through an open approach. The patient is under general anesthesia in a pediatric cardiac operating room or pediatric cardiac surgical suite. The workflow includes preoperative anesthesia evaluation and monitoring setup, median sternotomy or thoracotomy exposure, direct insertion of central cannulae for arterial and venous access to connect to the heart-lung machine, verification of cannula position and securement, initiation of extracorporeal circulation, and documentation of cannula insertion details (site, size, side, and any complications). Typical site of service is an inpatient operating room in a tertiary pediatric hospital. The service is for a child from birth through five years of age and is performed by a pediatric cardiothoracic surgeon with cardiac perfusion and anesthesiology support.

Coding Specifications

Modifier	Description	When to Use
`00`	No modifier — standard claim submission	Use as the default when no other modifier applies.
`11`	Professional component	Use if reporting a distinct professional component when applicable to billing arrangements.
`22`	Increased procedural services	Use when documentation supports significantly greater work than typical for cannula insertion (rare).
`23`	Unusual anesthesia	Use if anesthesia was medically necessary and unusually high-risk due to patient condition.
`50`	Bilateral procedure	Use if cannulation was performed on bilateral structures and payer rules permit.
`52`	Reduced services	Use if the procedure was partially reduced or not completed as planned.
`53`	Discontinued procedure	Use if the procedure was started but terminated due to extenuating circumstances.
`62`	Two surgeons	Use when two surgeons work together as primary surgeons during the same operative session.
`63`	Procedure performed on infants less than 4 kg	Use when patient weight meets CMS definition for modifier applicability (if payer requires).
`78`	Return to OR for related procedure during global period	Use if patient returns to the operating room for a related procedure during the global postoperative period.
`79`	Unrelated procedure or service by the same physician during the postoperative period	Use when an unrelated procedure is performed during the global period.
`81`	Minimum assistant surgeon	Use when an assistant surgeon performed minimal assistance as documented.
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist services in lieu of physician	Use when an allowed non-physician provider furnished the service under scope of practice and payer policy permits.
`ET`	Clinical trial or registry	Use when the procedure is performed as part of a qualifying clinical trial or registry requiring this modifier.

Taxonomy Code	Specialty	Notes
208800000X	Pediatric Cardiothoracic Surgery	Primary specialty performing open cannulation for cardiopulmonary bypass in infants and young children.
207L00000X	Pediatric Cardiac Surgery	Surgeons focused on congenital heart surgery; commonly perform this procedure.
207P00000X	Cardiac Surgery	Cardiac surgeons in centers that treat pediatric patients.
2080P0001X	Pediatric Critical Care Medicine	Provides perioperative critical care and postoperative ICU management.
207K00000X	Anesthesiology	Pediatric cardiac anesthesiologists provide anesthesia and hemodynamic management during cannulation.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`Q23.4`	Hypoplastic left heart syndrome	Common congenital cardiac lesion requiring staged open procedures with cardiopulmonary bypass and central cannulation.
`Q21.1`	Atrial septal defect	May require open repair with cardiopulmonary bypass and central cannulation in infants.
`Q21.0`	Ventricular septal defect	Frequently repaired via open approach using cardiopulmonary bypass in young children.
`Q20.0`	Common arterial trunk (truncus arteriosus)	Requires neonatal/infant open repair with extracorporeal circulation and central cannulation.
`Q22.4`	Pulmonary valve atresia	Lesions requiring surgical correction with cardiopulmonary bypass and central cannulation.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`33945`	Cannulation of peripheral vessel for extracorporeal circulation (other than central)	May be used when peripheral cannulation is performed instead of open central cannulation.
`33210`	Insertion of temporary transvenous cardiac pacing electrode, single or dual lead	May be performed before or after bypass for rhythm management in infants undergoing cardiac surgery.
`93503`	Insertion and repositioning of intracardiac catheter, arterial or venous, not including cardiac catheterization	May be used for catheter placement related to monitoring or postoperative support in the same operative episode.
`00530`	Anesthesia for procedures on the heart and pericardial sac; open procedures	Anesthesia code commonly reported by pediatric cardiac anesthesiologists for open heart cases requiring cardiopulmonary bypass.
`99499`	Unlisted evaluation and management service	May be used for complex perioperative services not described elsewhere when documentation supports billing.