CPT code 93584 covers catheter-based vein imaging performed during the same session as diagnostic or interventional heart catheterization to assess an anomalous or persistent superior vena cava (SVC) on the side opposite a first SVC. The code is specific to adjunctive venous imaging in the setting of congenital cardiac anomalies and is relevant to pediatric and adult congenital heart programs, interventional cardiology teams, and hospital billing operations. Nationally, accurate coding for such specialized intraprocedural imaging supports appropriate clinical documentation, resource allocation, and claims consistency for complex congenital interventions. Key payers included in the national analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical context for use of the code, typical sites of service, and payer coverage landscape. The publication outlines common billing modifiers and administrative considerations, highlights coding boundaries and clinical scenarios where the code applies, and identifies where input data was not available. This resource is designed to clarify coding intent and operational use for coding professionals, clinical billers, and institutional compliance teams involved in congenital cardiac catheterization services.