Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Mr. Brien Rex Miller, DO

Individual provider Gastroenterology Physician · NPI 1992066799

Mr. Brien Rex Miller, DO practises Gastroenterology in St George, Utah. Graduated from At Still University of Health Sciences, College of Osteo Med, Kirksville in 2012, 14 years ago. Practices with Utah Gastroenterology LLC, a 71-clinician group and accepts Medicare assignment. Licensed in Utah.

Years since qualifying
14
Trained at
At Still University of Health Sciences, College of Osteo Med, Kirksville
Licensed in
UT
In the registry since
2012
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

368 E Riverside Dr Ste A
St George, UT 84790-6897
Phone: (435) 673-1149
Fax: (435) 673-1182
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence 10707936-1204 (UT)

Record details

NPI number1992066799
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJune 7, 2012
Last updated in NPPESDecember 5, 2019

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyGASTROENTEROLOGY
Also practisesINTERNAL MEDICINE
Medical schoolAT STILL UNIVERSITY OF HEALTH SCIENCES, COLLEGE OF OSTEO MED, KIRKSVILLE
Graduated 2012 (14 years in practice)
Group practice Utah Gastroenterology Llc — 71 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Colonoscopy 428 times · 99th percentile
Upper gastrointestinal (GI) endoscopy for acid reflux 464 times · 98th percentile

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients778
Services billed 14,508 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $1,130 62 payments · a meal or drink at a meeting or visit, not a fee
Education $89 1 payment · educational material or training, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

  • Intermountain Health Cedar City Hospital Hospital · Cedar City, UT
  • St. George Regional Hospital Hospital · St George, UT

Colleagues at Utah Gastroenterology LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 71 clinicians in the practice; 12 are shown here.

Other providers in St George