CPT 91034
Gastroesophageal reflux test
Last reviewed August 2026 · DataLily AI data team
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CPT 91034 at a glance
- Code
- 91034
- Code type
- CPT/HCPCS
- Short descriptor
- Gastroesophageal reflux test
- Category
- ASC Ancillary
- ASC eligibility
- ASC-eligible (ancillary)
- Typical setting
- Ambulatory surgery center (POS 24) or hospital outpatient department (POS 22).
- Medicare ASC rate
- $152.40 national · 2026Q2
What is CPT code 91034?
CPT 91034 is a CPT/HCPCS procedure code for gastroesophageal reflux test. Its official short descriptor is "Gastroesophageal reflux test". In the ASC context it is grouped under ASC Ancillary.
Is CPT 91034 eligible in an ambulatory surgery center (ASC)?
CPT 91034 is an ancillary service that can be provided in the ASC setting when it supports a surgical procedure.
Where is CPT 91034 typically performed?
Ambulatory surgery center (POS 24) or hospital outpatient department (POS 22).
What is the Medicare ASC payment rate for CPT 91034?
The national Medicare ASC payment rate for CPT 91034 is $152.40 (Medicare ASC Payment System, 2026Q2). This is the national, unadjusted Medicare amount; the amount an individual ambulatory surgery center is paid is adjusted for local wage index and may differ. It reflects Medicare's facility payment only and does not include the surgeon's professional fee.
Reference information about ASC eligibility and typical procedure setting. Codes, descriptors, and ASC-eligibility status change over time. This is a coding reference, not billing, coding, or legal advice. Always verify against current guidance and individual payer policy before scheduling or billing. CPT is a registered trademark of the American Medical Association. Read the DataLily AI data methodology.