HCPCS Level II code C1817 identifies an intracardiac septal defect implant system, a device used to close or repair defects in the cardiac septum. The code matters nationally because septal defect closure is a common structural heart intervention affecting device utilization, payer coverage policies, and hospital resource planning. Implant systems for atrial or ventricular septal defects have implications for procedural coding accuracy, device reimbursement, and post-procedure surveillance.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context for septal defect implant procedures, typical sites of service (cardiac catheterization lab or operating room in inpatient and outpatient settings), and the role of HCPCS Level II coding for device identification. The publication outlines common billing modifiers and other administrative elements when available, and summarizes what to expect in national payer coverage approaches. Where input data is not provided, the report notes that those specific items are not available.