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.