Summary & Overview
CPT 75756: Angiography, Internal Mammary, Radiological Supervision and Interpretation
CPT code 75756 denotes the radiological supervision and interpretation of angiography targeting the internal mammary vessels. This imaging-focused code is used when a contrast angiogram is performed to visualize the internal mammary artery, commonly to evaluate anatomy and suitability for coronary artery bypass grafting or other vascular assessments. The code matters nationally because it captures a discrete diagnostic imaging service essential to preoperative planning and vascular evaluation, with implications for clinical decision-making and hospital outpatient imaging workflows.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical context for the service, national benchmark considerations for utilization and coding practice, and summaries of common billing modifiers and administrative notes. The publication outlines how 75756 fits within diagnostic angiography services, typical sites of service (hospital radiology departments, outpatient imaging centers, catheterization labs), and the administrative elements that commonly accompany interpretation codes.
The analysis provides concise benchmarks where available, summaries of payer policy themes, and practical coding context to support accurate claim submission and revenue cycle coordination. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 75756 describes the radiological supervision and interpretation of angiography of the internal mammary. Angiography is an X‑ray study of blood vessels in which a radiopaque contrast agent is used to visualize vessel anatomy and flow. This specific service evaluates the internal mammary artery and related vasculature and may be performed to determine suitability for coronary artery bypass grafting or to assess vascular anatomy.
Service Type: Radiological supervision and interpretation (angiography)
Typical Site of Service: Hospital radiology department, outpatient imaging center, or catheterization laboratory
Clinical & Coding Specifications
Clinical Context
A 67-year-old male with multivessel coronary artery disease scheduled for coronary artery bypass grafting (CABG) is referred for preoperative evaluation of the internal mammary artery (IMA) as a potential conduit. The patient has exertional angina and prior coronary angiography indicating left anterior descending artery stenosis. The radiology team performs an angiographic study of the internal mammary artery using iodinated contrast under fluoroscopic guidance to assess vessel caliber, flow, patency, and suitability for harvesting.
The clinical workflow: the patient is admitted to the interventional radiology or cardiac catheterization suite; informed consent is obtained; intravenous access and monitoring are established; contrast is administered and selective angiography of the internal mammary artery (typically the internal mammary artery origin and proximal course) is performed under radiologic supervision; images are acquired and interpreted by the radiologist or interventional cardiologist; findings are documented in a formal report to inform surgical planning for CABG. Typical site of service is an outpatient or inpatient catheterization laboratory or interventional radiology suite; service type is diagnostic radiological supervision and interpretation of internal mammary angiography.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the physician interpretation component separate from technical services |