1. Home
  2. Directory
  3. Texas
  4. Harlingen
  5. Internal Medicine
  6. NPI Profile

TEXAS DIGESTIVE SPECIALISTS
NPI 1821127002
Internal Medicine - Gastroenterology in Harlingen, TX

Active since March 05, 2007CLIA Certified · 2 labs
512 VICTORIA LN STE 2, HARLINGEN, TX 78550(956) 365-4400(956) 365-4111 Get Directions Write a Review

NPPES record last updated: September 6, 2023. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Sep 6, 2023, Jan 10, 2023, Jan 18, 2022 and 2 more (5 updates tracked since 2020).

About Texas Digestive Specialists NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

TEXAS DIGESTIVE SPECIALISTS (NPI 1821127002) is a healthcare organization registered as a gastroenterology in Harlingen, Texas and active in the NPI registry since March 2007. The organization holds 2 active CLIA laboratory certificates, maintains 4 additional practice locations, and lists Nolan E Perez, President, as its authorized official.

NPPES Registry Identity

NPI1821127002
Entity TypeOrganization
Primary Taxonomy207RG0100X
Legal Business NameGASTROENTEROLOGY CONSULTANTS OF SOUTH TEXAS, PLLC
Location Address512 VICTORIA LN STE 2Harlingen, TX 78550-3227
Mailing Address512 Victoria Ln, Suite 2Harlingen, TX 78550-3226 · (956) 365-4400
Phone(956) 365-4400
Fax(956) 365-4111
Organization SubpartNo
Authorized OfficialNolan E PerezPresident · (956) 365-4400
Enumeration DateMarch 5, 2007
Last NPPES UpdateSeptember 6, 20235 updates tracked since enumeration
NPPES CertifiedSeptember 6, 2023
✔ NPI 1821127002 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 5

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
Definition
An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
Also ListedAnesthesiologyTaxonomy 207L00000X
Also ListedPathology · Anatomic Pathology & Clinical PathologyTaxonomy 207ZP0102X
Also ListedSurgeryTaxonomy 208600000X
Also ListedColon & Rectal SurgeryTaxonomy 208C00000X
512 VICTORIA LN STE 2, Harlingen, TX 78550
Open in Google Maps ↗

Other Names 1

Doing Business AsTexas Digestive Specialists

Secondary Practice Locations 4

Location 1305 Lorenaly DrBrownsville, TX 78526-4333 · Phone (956) 365-4400 · Fax (956) 365-4111
Location 2533 Pecan BlvdMcAllen, TX 78501-2356 · Phone (956) 365-4400 · Fax (956) 365-4111
Location 3720 N 77 SunshinestripHarlingen, TX 78550-8848 · Phone (956) 365-4400 · Fax (956) 365-4111
Location 44211 N Jackson RdMcAllen, TX 78504-6843 · Phone (956) 365-4400 · Fax (956) 365-4111

Other Identifiers 1

Medicaid186270802TX

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Molina Healthcare, WellPoint.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Texas Digestive Specialists is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

42

Medicare enrollment records show 42 clinicians reassign Medicare billing to Texas Digestive Specialists, which bills Medicare for the services they deliver. Of these, 18 practice at this address and 20 within 10 miles. Listed here are the 20 practicing nearest to this location.

Clinicians by Medicare Specialty 8

Gastroenterology15
Nurse Practitioner13
Pathology5
Certified Registered Nurse Anesthetist (CRNA)3
Colorectal Surgery (Proctology)2
Pediatric Medicine2
General Surgery1
Internal Medicine1

Nearest to this location (20)

See all 42
Araceley Berg, FNP-C
Nurse Practitioner
NPI 1215389887
512 VICTORIA LN STE 14
Harlingen, TX 78550
(956) 412-0055
✔ PECOS✔ Accepts MedicareSame address
Lisa Lopez, FNP
Nurse Practitioner
NPI 1275363004
512 VICTORIA LN STE 2
Harlingen, TX 78550
(956) 365-4400
✔ PECOS✔ Accepts MedicareSame address
Nadia Lozano, APRN, FNP-C
Nurse Practitioner
NPI 1023688645
512 VICTORIA LN STE 2
Harlingen, TX 78550
(956) 365-4400
✔ PECOS✔ Accepts MedicareSame address
Owen Maat, MD
Gastroenterology
NPI 1295780609
512 VICTORIA LN STE 2
Harlingen, TX 78550
(956) 365-4400
✔ PECOS✔ Accepts MedicareSame address
Nghia Nguyen, DO
Gastroenterology
NPI 1538725890
512 VICTORIA LN STE 2
Harlingen, TX 78550
(956) 365-4400
✔ PECOS✔ Accepts MedicareSame address
Mayra Rendon, FNP-BC
Nurse Practitioner
NPI 1861230344
512 VICTORIA LN STE 2
Harlingen, TX 78550
(956) 365-4400
✔ PECOS✔ Accepts MedicareSame address
Umran Senyer, M.D.
Pediatric Medicine
NPI 1477937688
512 VICTORIA LN STE 14
Harlingen, TX 78550
(956) 412-0055
✔ PECOSSame address
Mauro Silva, MD, MPH
Gastroenterology
NPI 1053815159
512 VICTORIA LN STE 2
Harlingen, TX 78550
(956) 365-4400
✔ PECOS✔ Accepts MedicareSame address
Oscar Alvarez, MD
Gastroenterology
NPI 1376565838
512 VICTORIA LN STE 2
Harlingen, TX 78550
(956) 365-4400
✔ PECOS✔ Accepts MedicareSame address
Alyssa Dawson, CRNA
Certified Registered Nurse Anesthetist (CRNA)
NPI 1154803039
512 VICTORIA LN STE 2
Harlingen, TX 78550
(956) 365-4400
✔ Accepts MedicareSame address
Nicole Grigg Gutierrez, MD
Gastroenterology
NPI 1750516035
512 VICTORIA LN STE 2
Harlingen, TX 78550
(956) 365-4400
✔ PECOS✔ Accepts MedicareSame address
Michelle Lopez, APRN, FNP
Nurse Practitioner
NPI 1821577552
512 VICTORIA LN STE 2
Harlingen, TX 78550
(956) 365-4400
✔ PECOS✔ Accepts MedicareSame address
Jessica Marren, CRNA
Certified Registered Nurse Anesthetist (CRNA)
NPI 1295032613
512 VICTORIA LN STE 2
Harlingen, TX 78550
(956) 365-4400
Same address
William Neumann, M.D.
Pathology
NPI 1487960969
512 VICTORIA LN STE 2
Harlingen, TX 78550
(956) 365-4400
✔ PECOSSame address
Nolan Perez, MD
Gastroenterology
NPI 1184726986
512 VICTORIA LN STE 2
Harlingen, TX 78550
(956) 365-4000
✔ PECOS✔ Accepts MedicareSame address
Jason Phillips, M.D.
Gastroenterology
NPI 1760442685
512 VICTORIA LN STE 2
Harlingen, TX 78550
(956) 365-4400
✔ PECOS✔ Accepts MedicareSame address
Mihaela Ringheanu, MD
Pediatric Medicine
NPI 1629059449
512 VICTORIA LN STE 14
Harlingen, TX 78550
(956) 412-0055
✔ PECOSSame address
Sandeep Samuel, MD
Gastroenterology
NPI 1174822647
512 VICTORIA LN STE 2
Harlingen, TX 78550
(956) 365-4400
✔ PECOS✔ Accepts MedicareSame address
Erika Tidwell, PMHNP-BC, FNP-C
Nurse Practitioner
NPI 1184190456
512 VICTORIA LN STE 14
Harlingen, TX 78550
(956) 365-4400
✔ PECOS✔ Accepts Medicare0.1 mi
Gabriela Bedolla, MD
Pathology
NPI 1619963352
720 N 77 SUNSHINESTRIP
Harlingen, TX 78550
(956) 365-4400
✔ PECOS✔ Accepts Medicare2.1 mi
See all 42 clinicians

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

CLIA Laboratory Certificates CMS CLIA 2

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 45D2238834

Gastroenterology Consultants Of South Texas · Harlingen, TX
Active · expires Oct 5, 2027
CLIA Number45D2238834
Laboratory TypePhysician Office
Certificate Effective DateOctober 6, 2025
Certificate Expiration DateOctober 5, 2027
Laboratory DirectorNolan E. Perez
Laboratory Phone(956) 365-4400
Laboratory LocationGastroenterology Consultants Of South Texas512 Victoria Lane Ste 2, Harlingen, TX 78550
CLIA data matches this NPI record on: Address Name Phone
This certificate is issued to a laboratory to perform only waived tests.

Certificate of Compliance 45D2119427

Texas Digestive Specialists · Harlingen, TX
Active · expires Dec 4, 2027
CLIA Number45D2119427
Laboratory TypeIndependent
Certificate Effective DateDecember 5, 2025
Certificate Expiration DateDecember 4, 2027
Laboratory DirectorWilliam L. Neumann
Laboratory Phone(956) 365-4400
Laboratory LocationTexas Digestive Specialists720 N 77 Sunshine Strip, Harlingen, TX 78550
CLIA data matches this NPI record on: Name Phone
This certificate is issued to a laboratory after an inspection that finds the laboratory to be in compliance with all applicable CLIA requirements.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Gastroenterology Consultants Of South Texas, PLLC's NPI number?

The NPI number for Gastroenterology Consultants Of South Texas, PLLC is 1821127002. It was assigned to this organization in the NPPES registry on March 5, 2007. The provider is doing business as Texas Digestive Specialists.

Where is Gastroenterology Consultants Of South Texas, PLLC located?

Gastroenterology Consultants Of South Texas, PLLC is located at 512 Victoria Ln Ste 2, Harlingen, TX 78550. The listed phone number is (956) 365-4400.

What is Gastroenterology Consultants Of South Texas, PLLC's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Gastroenterology Consultants Of South Texas, PLLC enrolled in Medicare?

Yes. Gastroenterology Consultants Of South Texas, PLLC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Gastroenterology Consultants Of South Texas, PLLC?

According to the CMS Revalidation Reassignment List (October 2026 release), 42 clinicians in 8 Medicare specialties reassign their Medicare billing to Gastroenterology Consultants Of South Texas, PLLC. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. The largest specialties are Gastroenterology (15), Nurse Practitioner (13) and Pathology (5). Of these, 18 practice at this address and 20 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Gastroenterology Consultants Of South Texas, PLLC hold CLIA laboratory certificates?

Yes. 2 active CLIA laboratory certificates are associated with this NPI under the federal Clinical Laboratory Improvement Amendments program. The certificates are listed in the CLIA Laboratory Certificates section above.

What insurance does Gastroenterology Consultants Of South Texas, PLLC accept?

Health plans from Molina Healthcare and WellPoint list Gastroenterology Consultants Of South Texas, PLLC as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Gastroenterology Consultants Of South Texas, PLLC was last updated on September 6, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.