Summary & Overview
CPT 93594: Diagnostic Cardiac Catheterization for Congenital Heart Defects
CPT code 93594 identifies a diagnostic cardiac catheterization performed for patients with congenital heart defects and abnormal native vessel connections. The procedure involves navigating a catheter into the right side of the heart to obtain intracardiac blood gas samples and perform hemodynamic measurements. This service is clinically significant because it provides direct physiologic data critical to diagnosing complex congenital cardiac anatomy and guiding subsequent interventions or management strategies.
Key national payers included in the analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical context for CPT code 93594, documentation and coding considerations that commonly influence claims, and an outline of expected sites of service. The publication also covers benchmarking perspectives and relevant policy considerations that affect coverage and payment practices nationally.
This summary equips clinicians, coding professionals, and payer policy teams with the essential clinical and service-level understanding of CPT code 93594, the typical care setting for the procedure, and the types of measurements obtained during the service. Data not available in the input will be noted in the corresponding detailed sections.
Billing Code Overview
CPT code 93594 describes cardiac catheterization procedures for patients born with one or more congenital heart defects and abnormal native vessel connections. The provider advances a catheter through the blood vessels to the heart, positions the catheter in the right side of the heart, and obtains blood samples to measure blood gases; additional hemodynamic measurements may be performed as part of the service.
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Service type: Diagnostic cardiac catheterization with intracardiac blood sampling and hemodynamic assessment for congenital heart disease
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Typical site of service: Hospital-based cardiac catheterization laboratory or specialized pediatric catheterization suite
Clinical & Coding Specifications
Clinical Context
A typical patient is an infant or child born with congenital heart defects such as tetralogy of Fallot, transposition of the great arteries, single ventricle physiology, or complex anomalous venous connections who requires hemodynamic assessment. The patient is brought to the cardiac catheterization laboratory by the pediatric cardiology team. Pre-procedure workflow includes review of prior imaging (echocardiography, cardiac MRI/CT), informed consent from guardians, assessment of anticoagulation and vascular access status, and anesthesia planning (general anesthesia or deep sedation). In the lab, vascular access is obtained (femoral, jugular, or umbilical in neonates), and a diagnostic catheter is navigated through the systemic venous circulation into the right atrium, right ventricle, and pulmonary artery. The operator obtains intracardiac and pulmonary artery blood samples for oxygen saturations and blood gases, measures intracardiac pressures and cardiac output, and may perform oximetry runs and step-up/step-down analyses to quantify shunts. Hemodynamic data guide decisions about need for intervention (e.g., transcatheter device closure, balloon angioplasty) or surgical planning. Post-procedure workflow includes hemostasis at access sites, monitoring in PACU or PICU, documentation of pressures and oxygen saturations, and discharge planning or transfer for definitive therapy.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | Routine modifier indicating no special circumstances | Not typically appended; used by some payors to indicate standard service |