Summary & Overview
HCPCS C9605: Bypass Graft Branch Revascularization, Add-on
HCPCS Level II code C9605 represents an add-on billing code for percutaneous transluminal revascularization of an additional branch subtended by a coronary artery bypass graft, involving any combination of drug-eluting stent, atherectomy, and angioplasty, with distal protection when performed. This code matters nationally because it captures incremental work and resource use in complex coronary bypass graft interventions, affecting physician and facility billing across acute cardiac care settings. Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
Readers will learn what clinical scenarios and procedural elements trigger use of C9605, how it relates to primary and related revascularization codes, and which service settings typically report it. The publication covers benchmark considerations and coding context important for billing accuracy and claims processing, including distinctions between single-vessel primary codes and add-on reporting for additional graft branches. Clinical context addresses the role of percutaneous interventions through bypass grafts in patients with coronary artery disease, including acute and chronic presentations. Policy and payer perspectives summarize coverage relevance without providing clinical recommendations. Data not available in the input for payer-specific reimbursement rates and payment policy details.
Billing Code Overview
HCPCS Level II code C9605 describes a percutaneous transluminal revascularization procedure performed on or through a coronary artery bypass graft (including internal mammary, free arterial, or venous grafts). The procedure may include any combination of drug-eluting intracoronary stent placement, atherectomy, and angioplasty, and can include distal protection when performed. Code C9605 is used to report each additional branch subtended by the bypass graft, and is billed in addition to the code for the primary revascularization procedure.
Service type: Percutaneous coronary revascularization of bypass graft branch (add-on)
Typical site of service: Cardiac catheterization laboratory (hospital or ambulatory surgical center) or other inpatient/outpatient cardiac interventional settings
Clinical & Coding Specifications
Clinical Context
A 72-year-old male with prior coronary artery bypass graft (CABG) including a left internal mammary artery (LIMA) graft to the left anterior descending artery presents with recurrent exertional chest pain and a recent positive stress imaging study. Coronary angiography demonstrates a focal severe stenosis in the LIMA graft with a distal vessel supplying two branches. The interventional cardiology team elects to perform percutaneous transluminal revascularization of the bypass graft with placement of a drug‑eluting intracoronary stent and balloon angioplasty; distal protection is used during the intervention. The procedure is performed in an inpatient cardiac catheterization laboratory under monitored anesthesia care. Post‑procedure the patient is observed in the cardiac telemetry unit for 24 hours for access site monitoring and rhythm surveillance, discharged on dual antiplatelet therapy, and scheduled for routine post‑PCI follow‑up.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | Unspecified modifier (payer specific) | Use per payer guidance when an administrative two‑digit modifier field is required but no other modifier applies. |
22 | Increased procedural services |