CPT code 33859 represents open surgical repair of an ascending aortic aneurysm using a graft with initiation of cardiopulmonary bypass. This is a high-acuity cardiothoracic procedure that often occurs in tertiary care centers and has substantial implications for hospital surgical services, resource use, and payer reimbursement policy nationally. The code captures both graft reconstruction of the ascending aorta and optional suspension of the aortic valve within the graft when performed.

Key payers in this national overview include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find concise information on the clinical context of the procedure, the typical site of service (inpatient operating room/cardiothoracic suite), and the kinds of data and benchmarks commonly reviewed for complex aortic surgery. The publication outlines where CPT code 33859 fits within surgical service lines and what stakeholders typically evaluate: utilization patterns, facility-level resource requirements, and coding specificity related to open ascending aortic repair with bypass.

Available input did not include specific ICD-10 pairings, payer-specific reimbursement rates, or associated taxonomies; those items are noted as not available in the input. The piece is intended to orient clinicians, coders, and policy analysts to the code’s clinical meaning and operational context and to identify the areas where further payer- or institution-specific data would be required for benchmarking or policy decisions.