Summary & Overview
CPT 75577: Coronary CTA Plaque Quantification and Post-Processing
CPT code 75577 represents computerized post-processing analysis of previously acquired coronary computed tomographic angiography (CTA) images to quantify and characterize coronary atherosclerotic plaque. This service supports objective assessment of plaque burden and composition, informing clinical evaluation of coronary artery disease. National attention to advanced imaging analytics and value-based cardiac care has increased the relevance of image post-processing codes like 75577 for both clinical decision-making and payer coverage policies. Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will gain a concise understanding of what CPT code 75577 covers, where the service is typically performed, and why it matters clinically. The publication also summarizes payer coverage patterns and benchmarks where available, highlights policy and coding considerations affecting reimbursement and documentation, and situates the code within the broader clinical workflow for coronary CTA. The content is intended to inform billing professionals, clinicians, and policy analysts about the technical nature of the service, typical utilization contexts, and relevant policy themes without providing clinical recommendations.
Billing Code Overview
CPT code 75577 describes the use of computer software to analyze data from a previously performed coronary computed tomographic angiography (CTA). The software quantifies and characterizes coronary atherosclerotic plaque, including fatty and calcified components, to help assess the severity of coronary artery disease. A physician or other qualified healthcare professional reviews the computer-generated results and issues a report.
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Service type: Image post-processing and quantitative plaque analysis
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Typical site of service: Outpatient imaging center or hospital outpatient department
Clinical & Coding Specifications
Clinical Context
A 62-year-old patient with hyperlipidemia and increasing exertional chest discomfort underwent coronary computed tomographic angiography (CTA) at an outpatient imaging center. The CTA acquisition was completed and stored in the picture archiving and communication system. The cardiologist orders quantitative plaque analysis using dedicated software to characterize and measure coronary atherosclerotic plaque burden and composition (calcified, non-calcified, mixed) to inform risk stratification and guide medical management. A radiologist or cardiologist with expertise in cardiac CT reviews the computer-generated plaque quantification, verifies automated segmentations, adjusts measurements if needed, interprets findings in the clinical context, and issues a formal report to the referring provider. Typical site of service is an outpatient radiology or cardiology imaging facility with cardiac CT capability; may also occur in a hospital radiology department when studies are performed during inpatient or observation stays.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when reporting only the physician interpretation of the software analysis separate from technical acquisition. |
TC | Technical component |