Billing Code Overview

HCPCS Level II code C9608 describes percutaneous transluminal revascularization of a chronic total occlusion in a coronary artery, coronary artery branch, or coronary artery bypass graft using any combination of a drug‑eluting intracoronary stent, atherectomy, and angioplasty. The code specifically represents the payment line for an each additional coronary artery, coronary artery branch, or bypass graft treated, and is reported in addition to the primary procedure code for the initial vessel.

Service Type: Cardiology — Percutaneous Coronary Intervention

Typical Site of Service: Outpatient hospital facility (OPPS, APC assignment to 0656)

Clinical Context

An adult patient presents to the outpatient hospital interventional cardiology suite with chest pain and objective evidence of myocardial ischemia. Coronary angiography identifies a chronic total occlusion (CTO) of a major coronary artery, branch, or a coronary artery bypass graft supplying ischemic myocardium. The interventional cardiology team performs percutaneous transluminal revascularization of the CTO using any combination of drug‑eluting intracoronary stent placement, atherectomy, and angioplasty. If additional separate coronary arteries, branches, or bypass grafts are treated during the same session, HCPCS Level II code C9608 is listed in addition to the primary procedure code to report each additional vessel revascularized. Typical workflow: pre-procedure evaluation and informed consent in the outpatient hospital setting, angiographic mapping and guidewire crossing of the CTO, adjunctive atherectomy or balloon angioplasty as needed, placement of drug‑eluting stent(s), completion angiography, post-procedure monitoring in the recovery area, and documentation of vessels treated and devices used.

Coding Specifications

• Modifiers

• 59 (Distinct Procedural Service): Use when the additional revascularization reported by HCPCS Level II code C9608 is separate and distinct from other procedures performed during the same encounter (for example, when documenting an additional CTO vessel separate from the primary vessel).

• 51 (Multiple Procedures): Use when multiple procedures are performed during the same session to indicate multiple surgical/operative services have been rendered; may be applied according to payer rules when C9608 is billed in addition to a primary primary procedure code.

• Associated provider taxonomies

• 207RC0000X — Cardiovascular Disease Physician: Physicians specializing in general cardiology and management of cardiovascular diseases.

• 207RI0011X — Interventional Cardiology Physician: Physicians who perform percutaneous coronary interventions, including CTO revascularization procedures.

• 207RG0300X — Geriatric Medicine Physician: Physicians focused on care of older adults; may be involved when geriatric patients undergo interventional procedures.

Related Diagnoses

• I21.9 — Acute myocardial infarction, unspecified

• Relevance: Acute myocardial infarction may present with coronary occlusion; while I21.9 denotes unspecified AMI, CTO procedures can be considered when chronic occlusion contributes to ischemia or in complex revascularization planning.

• I21.A1 — Myocardial infarction type 2

• Relevance: Type 2 MI results from supply-demand mismatch; coronary revascularization for chronic total occlusion may be part of the evaluation or treatment plan if ischemia is attributed to flow-limiting lesions.

• I21.A9 — Other myocardial infarction type

• Relevance: This code captures MI types not otherwise specified; documentation of the MI type supports clinical justification for coronary revascularization procedures such as those reported with C9608.

Related Codes

• C9607 — Percutaneous transluminal revascularization of chronic total occlusion, coronary artery, coronary artery branch, or coronary artery bypass graft, any combination of drug‑eluting intracoronary stent, atherectomy and angioplasty; single vessel

• Relationship: C9607 represents the primary single-vessel CTO revascularization procedure; C9608 is listed separately for each additional vessel treated in the same encounter.

• C9606 — Percutaneous transluminal revascularization of acute total/subtotal occlusion during acute myocardial infarction, coronary artery or coronary artery bypass graft, any combination of drug‑eluting intracoronary stent, atherectomy and angioplasty, including aspiration thrombectomy when performed, single vessel

• Relationship: C9606 describes acute MI-related revascularization for a single vessel; it is a distinct clinical scenario (acute thrombotic occlusion) and is an alternative primary code in acute MI cases rather than chronic CTO codes.

• C9600 — Percutaneous transcatheter placement of drug eluting intracoronary stent(s), with coronary angioplasty when performed; single major coronary artery or branch

• Relationship: C9600 is a more limited stent-plus-angioplasty single-vessel code; C9607/C9608 describe more complex CTO interventions often involving additional techniques.

• C9601 — Percutaneous transcatheter placement of drug‑eluting intracoronary stent(s), with coronary angioplasty when performed; each additional branch of a major coronary artery (List separately in addition to code for primary procedure)

• Relationship: C9601 is an add-on code for additional branches when using stent/angioplasty; conceptually similar to C9608 but for non-CTO stent/angioplasty scenarios.

• C9602 — Percutaneous transluminal coronary atherectomy, with drug eluting intracoronary stent, with coronary angioplasty when performed; single major coronary artery or branch

• Relationship: C9602 reports single-vessel atherectomy with stent; C9603 (below) and C9608 are add-on/alternative codes depending on vessel count and procedure type.

• C9603 — Percutaneous transluminal coronary atherectomy, with drug‑eluting intracoronary stent, with coronary angioplasty when performed; each additional branch of a major coronary artery (List separately in addition to code for primary procedure)

• Relationship: C9603 is the add-on counterpart to C9602 for additional branches; C9608 functions similarly but specifically for additional CTO vessel revascularizations.

• C9604 — Percutaneous transluminal revascularization of or through coronary artery bypass graft (internal mammary, free arterial, venous), any combination of drug‑eluting intracoronary stent, atherectomy and angioplasty, including distal protection when performed; single vessel

• Relationship: C9604 reports single-vessel graft revascularization; C9605 is its add-on for additional branches subtended by the graft. C9608 may be used in conjunction when multiple CTO vessels or grafts are treated, per payer guidance.

• C9605 — Percutaneous transluminal revascularization of or through coronary artery bypass graft (internal mammary, free arterial, venous), any combination of drug‑eluting intracoronary stent, atherectomy and angioplasty, including distal protection when performed; each additional branch subtended by the bypass graft (List separately in addition to code for primary procedure)

• Relationship: C9605 is the add-on code to C9604 for additional graft branches; C9608 is specific to additional CTO vessels and is billed in addition to the appropriate primary CTO or graft code when applicable.

National mean rates for HCPCS Level II code C9608 show substantial differences between Medicare and average commercial (BUCA) benchmarks: Medicare mean is not provided in the input, while BUCA (average commercial) mean is $1,879.89, indicating that available commercial means are materially higher than the unavailable Medicare benchmark. When comparing the largest listed commercial payers, UnitedHealthcare and Aetna report the highest mean rates at $5,021.83 and $4,260.50 respectively, while Cigna Health reports a much lower mean of $663.98.

Rate dispersion (P75 minus P25) varies widely across payers. Blue Cross Blue Shield and BUCA show the widest dispersion (BCBS: $4,512.50 - $0.00 = $4,512.50; BUCA: $4,399.75 - $8.00 = $4,391.75), reflecting a broad spread of reimbursed amounts. Cigna Health is the tightest (P75 $80.00 - P25 $70.00 = $10.00), indicating minimal variability. Aetna and UnitedHealthcare show moderate-to-high dispersion (Aetna range $5,796.75 - $853.50 = $4,943.25; UnitedHealthcare range $2,337.75 - $171.00 = $2,166.75). The table and chart below present the full breakdown.