CPT code 43237 denotes upper endoscopy combined with endoscopic ultrasound (EUS) performed via a flexible transoral endoscope with an ultrasound transducer to examine the esophagus, stomach, duodenum, and adjacent tissues. The code captures a procedure widely used for staging gastrointestinal cancers, assessing subepithelial lesions, and guiding tissue sampling when endoscopic visualization alone is insufficient. Nationally, this service is an important component of gastroenterology and surgical workflows because it provides high-resolution transmural and peritumoral assessment that impacts clinical decision-making and downstream resource use.

Key payers commonly covering this service include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical indications and the expected sites of service, plus coverage considerations and common billing modifiers listed in the metadata. The publication outlines benchmarks related to utilization and site-of-service patterns where available, summarizes relevant policy and coding guidance, and clarifies procedural scope for coding and billing teams. Data not available in the input are explicitly noted where applicable. This resource is intended for billing professionals, compliance officers, and clinical administrators seeking a national-level briefing on CPT code 43237 and its clinical context.