Independent US Healthcare Provider Directory & Public Medical Database Patient Guides
Medical Specialty Listing

Internal Medicine - Gastroenterology Specialists in Harlingen, TX

Browse 10 Internal Medicine - Gastroenterology providers listed in NPPES with a practice address in Harlingen, Texas.

10 Healthcare Providers

How Harlingen compares with the U.S.

Harlingen has 14 clinicians in Internal Medicine - Gastroenterology per 100,000 residents, 2.2 times the U.S. rate of 6.2.

That is 10 active clinicians in Internal Medicine - Gastroenterology with a practice address in Harlingen, for a population of 72,087.

The Texas rate is 4.9 per 100,000 residents.

What these numbers mean

Clinicians per 100,000 residents compares places of different sizes. We count active clinicians who list a practice address in the area in the federal NPI registry (NPPES) and divide by the number of people who live there, according to the U.S. Census Bureau. The U.S. rate is the same calculation for the whole country.

A higher number does not mean it is easier to get an appointment, that wait times are shorter, or that care is better. It also does not show how many clinicians are accepting new patients or which insurance plans they take. A lower number does not by itself mean there is a shortage.

City counts use the city name in each clinician's practice address. That postal city can cover a larger or smaller area than the city limits the Census Bureau uses for population, and many clinicians list only one address even if they work in several places. Cities with hospitals or large medical centers often list more specialists than the number of residents alone would suggest, because patients also come from nearby areas.

100% of clinicians in Internal Medicine - Gastroenterology in Harlingen listed in the CMS Medicare file (10 of 10) accept Medicare assignment. That is similar to the Texas share of 98%.

What is Medicare assignment?

A clinician who accepts Medicare assignment agrees to take the Medicare-approved amount as full payment for services that Original Medicare covers. You usually still pay your deductible and coinsurance. This comes from the CMS Doctors and Clinicians file and applies to Original Medicare only. Medicare Advantage plans have their own provider networks. It does not show whether a clinician is taking new patients.

Some clinicians are listed as "may accept assignment," which means they can decide case by case. Clinicians without an assignment flag, or who are not in the CMS file, are not counted as accepting assignment. That does not mean they refuse Medicare. Ask the office before your visit.

10% of clinicians in Internal Medicine - Gastroenterology in Harlingen listed in the CMS Medicare file (1 of 10) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is lower than the Texas share of 40%.

About the telehealth indicator

The telehealth indicator comes from CMS. It marks clinicians whose recent paid Medicare claims include services delivered by telehealth. It means a clinician has provided some services by telehealth, not that every visit can be done online. A clinician without the indicator may still offer telehealth, for example to patients who are not on Medicare. Ask the office which visits can be done by video or phone.

These figures summarize public federal data. They do not measure quality of care, appointment availability, or whether a clinician accepts your insurance or new patients. Registry addresses can be out of date. Please confirm details directly with the office and your plan. This information is not medical advice.

Prepared by T-MedInfo from NPPES, CMS and U.S. Census Bureau data. Questions or corrections: support@true-medinfo.com ยท Methodology

Sources: Clinician counts and practice addresses: NPPES NPI Registry, Centers for Medicare & Medicaid Services (CMS), data as of August 2026. Medicare assignment and telehealth indicators: CMS Doctors and Clinicians National Downloadable File. Population: U.S. Census Bureau, American Community Survey 2020-2024 5-Year Estimates, Table B01003 (Total Population).

Showing 1โ€“10 of 10 providers
With recent CMS data first, then Aโ€“Z

Dr. Oscar A Alvarez , MD

Internal Medicine - Gastroenterology

Active NPI Status Accepts Medicare Assignment
512 Victoria Ln Ste 2, Harlingen, TX 785503227
Phone: 9563654400
NPI Identifier 1376565838
View Full Profile

Dr. Wayne D Green , MD

Internal Medicine - Gastroenterology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
3101 South 77 Sunshine Strip, Suite A, Harlingen, TX 785508904
Phone: 9564231050
NPI Identifier 1114906278
View Full Profile

Dr. Nicole M Grigg Gutierrez , MD

Internal Medicine - Gastroenterology

Active NPI Status Accepts Medicare Assignment
512 Victoria Ln Ste 2, Harlingen, TX 785503227
Phone: 9563654400
NPI Identifier 1750516035
View Full Profile

Dr. Oral Cobley James , MD

Internal Medicine - Gastroenterology

Active NPI Status Accepts Medicare Assignment
1806 Runnels St, Harlingen, TX 785508288
Phone: 9563570950
NPI Identifier 1235178799
View Full Profile

Dr. Owen S Maat , MD

Internal Medicine - Gastroenterology

Active NPI Status Accepts Medicare Assignment
512 Victoria Ln Ste 2, Harlingen, TX 785503227
Phone: 9563654400
NPI Identifier 1295780609
View Full Profile

Dr. Nghia Duy Nguyen , DO

Internal Medicine - Gastroenterology

Active NPI Status Accepts Medicare Assignment
512 Victoria Ln Ste 2, Harlingen, TX 785503227
Phone: 9563654400
NPI Identifier 1538725890
View Full Profile

Dr. Nolan E Perez , MD

Internal Medicine - Gastroenterology

Active NPI Status Accepts Medicare Assignment
512 Victoria Ln Ste 2, Harlingen, TX 785503227
Phone: 9563654000
NPI Identifier 1184726986
View Full Profile

Dr. Jason Robert Phillips , MD

Internal Medicine - Gastroenterology

Active NPI Status Accepts Medicare Assignment
512 Victoria Ln Ste 2, Harlingen, TX 785503227
Phone: 9563654400
NPI Identifier 1760442685
View Full Profile

Dr. Sandeep Thomas Samuel , MD

Internal Medicine - Gastroenterology

Active NPI Status Accepts Medicare Assignment
512 Victoria Ln Ste 2, Harlingen, TX 785503227
Phone: 9563654400
NPI Identifier 1174822647
View Full Profile

Dr. Mauro Silva , MD, MPH

Internal Medicine - Gastroenterology

Active NPI Status Accepts Medicare Assignment
512 Victoria Ln Ste 2, Harlingen, TX 785503227
Phone: 9563654400
NPI Identifier 1053815159
View Full Profile

Frequently Asked Questions about Internal Medicine - Gastroenterology in Harlingen

How do I check a Internal Medicine - Gastroenterology practitioner's license?

Each practitioner profile shows the NUCC taxonomy code and any state license number the practitioner reported to NPPES, plus a link to the Texas licensing board lookup. NPPES entries are self-reported; current license status is published only by the state board.

Why is a practitioner missing from this list?

This list shows NPI records that are active in NPPES. A deactivated NPI keeps its profile with the deactivation date and practice history; find it with the site search by name or NPI number.