CPT code 91133 designates diagnostic transcutaneous electrogastrography, a noninvasive test that records gastric myoelectrical activity at baseline and after drug provocation to evaluate suspected gastric motility disorders. This procedure matters nationally as a specialized diagnostic tool used by gastroenterology and motility centers to clarify causes of chronic nausea, vomiting, and other suspected motility dysfunctions when standard testing is inconclusive.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication provides a concise overview of clinical context, coding specifics, and the payer landscape to inform billing, coverage expectations, and documentation priorities across major national payers.

Readers will learn the clinical purpose of the code, typical sites of service, common modifiers and billing considerations (where provided), and what to expect regarding payer coverage patterns and benchmarks. The summary includes practical policy context and benchmarking insights to aid revenue integrity, clinical documentation, and prior authorization workflows. Data not available in the input is noted where applicable.