CPT code 43820 represents a gastrojejunostomy procedure in which the surgeon creates an anastomosis between the stomach and the proximal loop of the jejunum without dividing the vagus nerve. This code captures a specific operative technique used to restore gastric outflow or bypass obstructed distal stomach or duodenum and is relevant across hospitals and surgical centers nationwide. It matters for national reimbursement, registry classification, and quality measurement because it distinguishes the procedure’s technical approach and vagal nerve preservation.

Key payers considered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise review of clinical context for the procedure, coding considerations for billing teams, and common modifiers associated with surgical services. The publication provides benchmarks and policy context where available, discussion of typical sites of service, and guidance on documentation elements tied to the operative description. Data not available in the input will be noted as such rather than extrapolated. The content is intended to support revenue cycle, clinical coding, and surgical service line stakeholders in understanding how CPT code 43820 is used and where it fits within broader procedural coding and billing workflows.