CPT code 33877 represents open surgical repair of a thoracoabdominal aortic aneurysm or focal aortic wall swelling using a graft, performed with or without cardiopulmonary bypass. This high-acuity vascular procedure is nationally significant due to its complexity, resource intensity, and impact on perioperative morbidity and mortality. Payers commonly covering services of this type include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

Readers will find clinical and billing context for CPT code 33877, including the procedure’s role in managing thoracoabdominal aortic pathology, expected site of service, and operative considerations tied to cardiopulmonary bypass. The publication outlines national benchmarks and payer coverage patterns where available, summarizes relevant policy or coding guidance changes that affect claim adjudication, and highlights documentation elements frequently reviewed in medical necessity and audit processes.

This summary is intended to orient clinicians, billing professionals, and policy analysts to the core clinical meaning and payer landscape associated with CPT code 33877, and to clarify what topics are addressed in the full publication: benchmarks, policy updates, and clinical context. Data not available in the input is noted where specific payer rates, taxonomies, ICD-10 pairings, and related codes would otherwise appear.