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HOUSTON REGIONAL GASTROENTEROLOGY INSTITUTE PLLC
NPI 1326587643
Internal Medicine - Gastroenterology in Sugar Land, TX

Active since February 20, 2017
15555 CREEK BEND DR STE 200, SUGAR LAND, TX 77478(832) 707-5011 Get Directions Write a Review

NPPES record last updated: June 17, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Apr 22, 2026, Mar 3, 2026, May 30, 2025 and 3 more (6 updates tracked since 2017).

About Houston Regional Gastroenterology Institute Pllc NPPES

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

HOUSTON REGIONAL GASTROENTEROLOGY INSTITUTE PLLC (NPI 1326587643), doing business as American Gastro Health, is a healthcare organization registered as a gastroenterology in Sugar Land, Texas and active in the NPI registry since February 2017. The organization maintains 25 additional practice locations and lists Adeeb Dwairy, Member, as its authorized official.

NPPES Registry Identity

NPI1326587643
Entity TypeOrganization
Primary Taxonomy207RG0100X
Legal Business NameHOUSTON REGIONAL GASTROENTEROLOGY INSTITUTE PLLC
Location Address15555 CREEK BEND DR STE 200Sugar Land, TX 77478-4670
Mailing Address15555 Creek Bend Dr Ste 200Sugar Land, TX 77478-4670
Phone(832) 707-5011
Organization SubpartNo
Authorized OfficialAdeeb DwairyMember · (281) 731-0619
Enumeration DateFebruary 20, 2017
Last NPPES UpdateJune 17, 20266 updates tracked since enumeration
NPPES CertifiedJune 17, 2026
✔ NPI 1326587643 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
License✔ Licensed in TX · P9555
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 ListedAnesthesiology · Pain MedicineTaxonomy 207LP2900X
15555 CREEK BEND DR STE 200, Sugar Land, TX 77478
Open in Google Maps ↗

Other Names 1

Doing Business AsAmerican Gastro Health

Secondary Practice Locations 25

Location 117510 W Grand Pkwy S Ste 220Sugar Land, TX 77479-2647 · Phone (281) 201-1338
Location 2219 Oak Dr S Ste ALake Jackson, TX 77566-5675 · Phone (979) 297-4033
Location 3284 Ed English Dr Ste AShenandoah, TX 77385-8032 · Phone (832) 934-7675
Location 410425 Huffmeister Rd Ste 200Houston, TX 77065-3429 · Phone (832) 912-4481
Location 521814 Katy Fwy Ste 220Katy, TX 77449-8020 · Phone (832) 707-5011
Location 6920 Medical Plaza Dr Ste 550Shenandoah, TX 77380-3259 · Phone (281) 440-0101
Location 718955 N Memorial Dr Ste 500Humble, TX 77338-4399 · Phone (281) 440-0101
Location 819701 Kingwood Dr Bldg 2Kingwood, TX 77339-3773 · Phone (832) 707-5011
Location 99816 Memorial Blvd Ste 206Humble, TX 77338-4206 · Phone (281) 446-8114
Location 10275 Lantern Bend Dr Ste 200Houston, TX 77090-2842 · Phone (281) 440-0101
Location 1116902 Southwest Fwy Ste 108Sugar Land, TX 77479-3574 · Phone (832) 707-5011 · Fax (281) 612-1992
Location 1224044 Highway 59 NKingwood, TX 77339-1500 · Phone (281) 501-5652
Location 1325230 Kingsland Blvd Ste 102Katy, TX 77494-2097 · Phone (281) 869-3009
Location 141631 North Loop W Ste 510Houston, TX 77008-1531 · Phone (713) 777-2555
Location 156550 Fannin St Ste 2301Houston, TX 77030-2723 · Phone (713) 777-2555
Location 1624510 Kingsland BlvdKaty, TX 77494-3429 · Phone (832) 707-5011
Location 179731 Wortham Blvd Ste 104Houston, TX 77065-3423 · Phone (832) 707-5011
Location 1821212 Northwest Fwy Ste 425ACypress, TX 77429-5884 · Phone (832) 921-4481
Location 191213 Hermann Dr Ste 278Houston, TX 77004-7009 · Phone (832) 707-5011
Location 2019701 Kingwood Dr Bldg 5Kingwood, TX 77339-3773 · Phone (832) 707-5011
Location 219180 Pinecroft Dr Ste 250Shenandoah, TX 77380-4261 · Phone (832) 934-7675
Location 2226940 Kuykendahl Rd Ste 104Tomball, TX 77375-0158 · Phone (832) 707-5011
Location 231240 Blalock Rd Ste 210Houston, TX 77055-6445 · Phone (281) 869-3009
Location 247737 Southwest Fwy Ste 840Houston, TX 77074-1819 · Phone (713) 777-2555
Location 252647 Cordes DrSugar Land, TX 77479-1353 · Phone (832) 707-5011

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 Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and more.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)

Houston Regional Gastroenterology Institute Pllc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

41

Medicare enrollment records show 41 clinicians reassign Medicare billing to Houston Regional Gastroenterology Institute PLLC, which bills Medicare for the services they deliver. Of these, 4 practice at this address and 10 within 10 miles. Listed here are the 20 practicing nearest to this location.

Clinicians by Medicare Specialty 4

Gastroenterology27
Nurse Practitioner9
Internal Medicine4
Registered Dietitian or Nutrition Professional1

Nearest to this location (20)

See all 41
Shaadi Abughazaleh
Gastroenterology
NPI 1487159984
15555 CREEK BEND DR STE 200
Sugar Land, TX 77478
(832) 707-5011
✔ PECOS✔ Accepts MedicareSame address
Abraham Chacko, D.O.
Gastroenterology
NPI 1902117773
15555 CREEK BEND DR STE 200
Sugar Land, TX 77478
(832) 707-5978
✔ PECOS✔ Accepts MedicareSame address
Adeeb Dwairy, MD
Gastroenterology
NPI 1679826929
15555 CREEK BEND DR., SUITE 200
Sugar Land, TX 77478
(832) 707-5011
✔ PECOS✔ Accepts MedicareSame address
Pragnesh Patel, MD
Gastroenterology
NPI 1265787360
15555 CREEK BEND DR STE 200
Sugar Land, TX 77478
(832) 707-5011
✔ PECOS✔ Accepts MedicareSame address
Malcolm Irani, M.D.
Gastroenterology
NPI 1285083618
2647 CORDES DR
Sugar Land, TX 77479
(832) 707-5011
✔ PECOS✔ Accepts Medicare1.0 mi
Rhoda Olatayo
Nurse Practitioner
NPI 1821706912
10814 S KIRKWOOD RD
Houston, TX 77099
(281) 498-3200
✔ PECOS✔ Accepts Medicare4.2 mi
Gregory Shannon, M.D.
Internal Medicine
NPI 1730148495
17510 W GRAND PKWY S #220
Sugar Land, TX 77479
(281) 201-1338
✔ PECOS✔ Accepts Medicare5.2 mi
Daniel Ball, M.D,
Gastroenterology
NPI 1730175183
7737 SOUTHWEST FWY SUITE #840
Houston, TX 77074
(137) 777-2555
✔ PECOS✔ Accepts Medicare8.4 mi
Kelly Lowe, APRN, AGACNP-BC
Gastroenterology
NPI 1679205082
7737 SOUTHWEST FWY
Houston, TX 77074
(713) 777-2555
✔ PECOS✔ Accepts Medicare8.4 mi
Krishnamurthy Shivshanker, M.D.
Gastroenterology
NPI 1982699682
7737 SOUTHWEST FWY SUITE #840
Houston, TX 77074
(713) 777-2555
✔ PECOS✔ Accepts Medicare8.4 mi
Ann Clare Thachil
Nurse Practitioner
NPI 1225906142
4919 NATCHEZ TRCE
Fresno, TX 77545
(563) 505-1935
✔ PECOS✔ Accepts Medicare11 mi
Richard Robbins, M.D.
Internal Medicine
NPI 1699033340
7200 CAMBRIDGE ST STE 8B
Houston, TX 77030
(713) 798-0946
✔ PECOS✔ Accepts Medicare15 mi
Ruth Bell, DO
Internal Medicine
NPI 1912562604
6431 FANNIN ST # 4.232
Houston, TX 77030
(713) 500-6631
✔ PECOS✔ Accepts Medicare15 mi
Natalia Martin, DO
Gastroenterology
NPI 1487273512
25230 KINGSLAND BLVD STE 102
Katy, TX 77494
(281) 869-3009
✔ PECOS✔ Accepts Medicare16 mi
Salaah Siddiqui, DO
Internal Medicine
NPI 1891225264
25230 KINGSLAND BLVD STE 102
Katy, TX 77494
(281) 869-3009
✔ PECOS✔ Accepts Medicare16 mi
Radha Tamerisa, M.D.
Gastroenterology
NPI 1366440653
25230 KINGSLAND BLVD STE 102
Katy, TX 77494
(281) 869-3009
✔ PECOS✔ Accepts Medicare16 mi
Dana Hong, FNP-BC
Nurse Practitioner
NPI 1073017604
25230 KINGSLAND BLVD STE 102
Katy, TX 77494
(281) 947-6684
✔ PECOS✔ Accepts Medicare16 mi
Ryan Barrientos, MD
Gastroenterology
NPI 1982975405
1213 HERMANN DR STE 278
Houston, TX 77004
(832) 707-5011
✔ PECOS✔ Accepts Medicare16 mi
Daniel Burkholder, MD
Gastroenterology
NPI 1871153981
1213 HERMANN DR STE 278
Houston, TX 77004
(832) 707-5011
✔ PECOS✔ Accepts Medicare16 mi
Agnes Asamah, FNP-C
Nurse Practitioner
NPI 1336618511
10425 HUFFMEISTER RD STE 200
Houston, TX 77065
(832) 912-4481
✔ PECOS✔ Accepts Medicare22 mi
See all 41 clinicians

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

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 Houston Regional Gastroenterology Institute PLLC's NPI number?

The NPI number for Houston Regional Gastroenterology Institute PLLC is 1326587643. It was assigned to this organization in the NPPES registry on February 20, 2017. The provider is doing business as American Gastro Health.

Where is Houston Regional Gastroenterology Institute PLLC located?

Houston Regional Gastroenterology Institute PLLC is located at 15555 Creek Bend Dr Ste 200, Sugar Land, TX 77478. The listed phone number is (832) 707-5011.

What is Houston Regional Gastroenterology Institute PLLC's specialty?

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

Is Houston Regional Gastroenterology Institute PLLC enrolled in Medicare?

Yes. Houston Regional Gastroenterology Institute PLLC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Houston Regional Gastroenterology Institute PLLC?

According to the CMS Revalidation Reassignment List (October 2026 release), 41 clinicians in 4 Medicare specialties reassign their Medicare billing to Houston Regional Gastroenterology Institute 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 (27), Nurse Practitioner (9) and Internal Medicine (4). Of these, 4 practice at this address and 10 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

What insurance does Houston Regional Gastroenterology Institute PLLC accept?

Health plans from Ambetter Health, Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and Ambetter from Superior HealthPlan and 3 other insurers list Houston Regional Gastroenterology Institute 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 Houston Regional Gastroenterology Institute PLLC was last updated on June 17, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 months 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.