CPT code 91034 represents placement of a pH electrode for gastroesophageal reflux testing with recording and interpretation of the resulting report. This diagnostic procedure is a key tool in evaluating suspected gastroesophageal reflux disease (GERD) and atypical reflux presentations; its use affects clinical decision-making about medical therapy, surgical referral, and long-term management. Nationally, reimbursement and coverage policies for ambulatory pH monitoring influence access to confirmatory testing and downstream care.

Key payers included in this analysis are Aetna, Blue Cross Blue Shield, Cigna, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical purpose of the code, typical sites of service, and the service type. The publication outlines common billing modifiers and related administrative considerations where available. It also provides benchmarks and payer coverage context where permitted, as well as notes on documentation and interpretation expectations tied to the service.

This summary is oriented to clinicians, billing professionals, and policy analysts seeking a compact reference on CPT code 91034, its clinical role in GER evaluation, and the payer landscape that shapes utilization and access to esophageal pH monitoring nationally.