CPT code 91035: Reflux testing, mucosa-attached telemetry electrode2026 Medicare rate & RVUs

Medicare pays $502.35 for 91035 nationally in the office. Local office rates run $437.09–$702.66.

Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.

What 91035 covers

This service uses a wireless pH electrode attached to the esophageal lining to collect acid readings during ambulatory monitoring. A gastroenterologist or other qualified clinician commonly places the electrode during an upper endoscopy; the patient then leaves with the recorder and follows instructions for documenting symptoms and activities. The completed study is analyzed to assess esophageal acid exposure and its relationship to reported symptoms, such as persistent heartburn or regurgitation.

Report 91035 for the wireless, mucosa-attached monitoring method, including electrode placement, recording, analysis, and interpretation. Documentation should identify the clinical reason for testing and support the recorded study and interpretation. The global service includes the professional interpretation and technical recording; modifier 26 identifies the professional component, while TC identifies the technical component. The 0-day global period includes same-day preoperative and postoperative care. Modifier 50 is inappropriate for this service. Assistant-at-surgery payment requires documented medical necessity; co-surgeon and team-surgery billing are not permitted.

This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.

Where 91035 pays more and less

The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.

109 of 109 payment localities

91035 rates by state

Office rate range in each state. Select a state to see its payment localities.

How the 91035 rate is calculated

Each of 91035’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.

Payment rules and modifiers for 91035

The CMS indicators that decide how 91035 is paid alongside other services.

What modifiers do to the payment

When to use modifier 26

91035 compared with similar codes

How to choose

91034Reflux monitoringNasal catheter pH test

Choose 91035 for wireless pH monitoring using an electrode attached to the esophageal lining. Choose 91034 for catheter-based pH monitoring.

91037Esophageal impedanceOne hour or less

91037 reports esophageal impedance testing, rather than the mucosa-attached wireless pH study reported with 91035.

91038Esophageal impedanceMore than one hour

91038 reports esophageal impedance testing for more than one hour. 91035 is the wireless mucosa-attached pH monitoring service.

Codes related to 91035

Related codes aren’t interchangeable: bill the code that matches the service performed.

Where these rates come from

FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.

CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027

Open CMS sourceHow we calculate rates