91034 Gastroesophageal reflux test
Also known as: pH monitoring, acid reflux test, GERD study
Gastroesophageal reflux test to monitor and record acid exposure in the esophagus over an extended period.
In Plain Language
24-hour acid monitoring; test to measure reflux from stomach
Clinical Context
Extended monitoring study (typically 24-48 hours) to document frequency, duration, and severity of acid reflux episodes in patients with suspected gastroesophageal reflux disease.
RVU Breakdown
| Work RVU | 0.95 |
| Total RVU | 0.95 |
Est. Medicare Payment
National estimate based on 2026 CMS PFS Conversion Factor ($33.40). Actual payment varies by locality (GPCI adjustment).
Billing & Documentation
Medicine section codes cover a wide range of non-surgical services. This code has a 0-day global period, meaning pre- and post-operative E&M visits are billable separately on the same day. Documentation should include the clinical indication, procedure details, interpretation (if applicable), and any patient-specific findings.
How This Code Compares
With a work RVU of 0.95, this code ranks in the 56th percentile among Medicine codes — 1.2x the median (0.78). The highest wRVU in this category is 23.92.
Specialties
Frequently Asked Questions
What is CPT code 91034?
CPT 91034 (Gastroesophageal reflux test) is a Medicine code. Gastroesophageal reflux test to monitor and record acid exposure in the esophagus over an extended period.
Who uses CPT code 91034?
CPT 91034 is used by Gastroenterology, Internal Medicine, Surgery. Extended monitoring study (typically 24-48 hours) to document frequency, duration, and severity of acid reflux episodes in patients with suspected gastroesophageal reflux disease.
When is CPT 91034 used?
Extended monitoring study (typically 24-48 hours) to document frequency, duration, and severity of acid reflux episodes in patients with suspected gastroesophageal reflux disease.
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CPT® is a registered trademark of the American Medical Association. Data sourced from CMS Physician Fee Schedule RVU26A. Descriptions, synonyms, and clinical context are original content by RVU Edge.