CPT code 43633 denotes a partial gastrectomy in which the lower stomach is removed and the upper small intestine is anastomosed to the remaining stomach. As a major abdominal operation, it is performed for several clinical indications such as peptic ulcer disease complications, malignancy, or other structural pathology requiring gastric resection and reconstruction. The code matters nationally because it represents a high-acuity inpatient surgical service with implications for operative resource use, postoperative care needs, and payer reimbursement patterns.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise clinical context for the procedure, typical sites of service, and which payers are relevant for coverage and billing workflows. The publication outlines benchmarks and common billing considerations, clarifies coding descriptors, and summarizes policy updates that affect authorization and inpatient billing for major gastrointestinal surgery.

This resource is intended for billing managers, surgical service line leaders, and payer relations teams seeking a national overview of CPT code 43633 and its clinical and administrative context.