HealthcareDiscovery.AI / Doctors / Texas / Allergy & Immunology (Internal Medicine)

Allergists (Internal Medicine) in Texas

Data updated monthly · Last refresh October 2026

49 Allergy & Immunology (Internal Medicine) providers practice in Texas, including 16 (33%) offering telehealth. The largest concentration is in Houston. Profiles include federal Open Payments records of money received from drug and device companies in 2025. Listings are drawn from federal public records and are not endorsements.

49providers
16telehealth
Houstontop city

Allergy & Immunology (Internal Medicine) by city in Texas

Choose a city to see providers there.

Allergy & Immunology (Internal Medicine) in Houston18 providers
Allergy & Immunology (Internal Medicine) in Dallas5 providers
Allergy & Immunology (Internal Medicine) in Galveston3 providers
Allergy & Immunology (Internal Medicine) in San Antonio3 providers
Allergy & Immunology (Internal Medicine) in Austin3 providers
Allergy & Immunology (Internal Medicine) in Dickinson2 providers
Allergy & Immunology (Internal Medicine) in Lubbock2 providers
Allergy & Immunology (Internal Medicine) in Richardson1 providers
Allergy & Immunology (Internal Medicine) in Murphy1 providers
Allergy & Immunology (Internal Medicine) in Corsicana1 providers
Allergy & Immunology (Internal Medicine) in Fort Worth1 providers
Allergy & Immunology (Internal Medicine) in El Paso1 providers
Allergy & Immunology (Internal Medicine) in Round Rock1 providers
Allergy & Immunology (Internal Medicine) in Plano1 providers
Allergy & Immunology (Internal Medicine) in Harker Heights1 providers
Allergy & Immunology (Internal Medicine) in College Station1 providers
Allergy & Immunology (Internal Medicine) in Fort Hood1 providers
Allergy & Immunology (Internal Medicine) in Fort Sam Houston1 providers
Allergy & Immunology (Internal Medicine) in League City1 providers
Allergy & Immunology (Internal Medicine) in Cypress1 providers

Where Allergists (Internal Medicine) in Texas practice

From CMS Medicare enrollment records covering 34 of the 49 providers listed here (69%). Providers who do not bill Medicare are not included in these figures.

29%solo or small practice (under 10 clinicians)
0%mid-size group (10 to 99)
71%large group or health system (100+)

Largest practice groups

Group (as registered with Medicare)Allergists (Internal Medicine)All clinicians in groupMain city
University of Texas Southwestern Medical Center at Dallas43,156Dallas
Ut Physicians31,744Houston
Utmb Faculty Group Practice31,083Galveston
Scott and White Clinic22,426College Station
Tmh Physician Associates PLLC21,881Houston

Hospitals where they hold privileges

HospitalCityOwnershipCMS star ratingAllergists (Internal Medicine) affiliated
University of Texas Medical Branch GalvestonGalvestonGovernment3 of 53
Ut of Texas Southwestern University Hospital - William P. Clements Jr.DallasGovernment4 of 53
Memorial Hermann - Texas Medical CenterHoustonNonprofit4 of 52
Houston Methodist HospitalHoustonNonprofit5 of 52
Parkland Health & Hospital SystemDallasGovernment3 of 52

Sources: CMS Doctors and Clinicians (August 2026) and Facility Affiliation files (August 2026); hospital ownership type and overall star rating from CMS Hospital General Information (July 2026). A clinician in several groups is counted once, in the largest group they bill through. Ownership type is what the hospital reports to CMS; it does not show private equity or other investor ownership. How we build this directory.

Allergy & Immunology (Internal Medicine) providers in Texas

Listed by city, largest first. Payment figures come from the federal Open Payments program, which requires drug and device companies to report what they pay physicians for consulting, speaking, meals, travel and royalties. A disclosed payment is a financial relationship, not evidence of wrongdoing, and many totals reflect a single meal. Figures cover calendar year 2025.

Dr. Elisabeth Clayton, MD
Austin, TX · $410 in drug and device payments (2025) · Telehealth · (512) 346-8888
Dr. Michael Volz, M.D.
Austin, TX · $196 in drug and device payments (2025) · (832) 824-1000
Dr. Narendra Punjabi, MD
Austin, TX · $110 in drug and device payments (2025) · Telehealth · (512) 346-8652
Dr. Rigoberto Acosta, M.D.
College Station, TX · No drug or device payments recorded (2025) · (979) 207-7400
Dr. Joseph Mcnally, MD
Corsicana, TX · No drug or device payments recorded (2025) · (903) 872-3005
Dr. Sharon Gendi, M.D.
Cypress, TX · No drug or device payments recorded (2025) · Telehealth · (281) 894-5400
Dr. Barbara Baxter, MD
Dallas, TX · $716 in drug and device payments (2025) · (214) 363-8653
Dr. Christian Wysocki, M.D., PH.D.
Dallas, TX · $126 in drug and device payments (2025) · Telehealth · (214) 645-2800
Dr. David Khan, MD
Dallas, TX · $231 in drug and device payments (2025) · Telehealth · (214) 645-8600
Dr. Rebecca Gruchalla, MD PHD
Dallas, TX · $104 in drug and device payments (2025) · Telehealth · (214) 645-2866
Dr. Rina Lee, MD
Dallas, TX · No drug or device payments recorded (2025) · (214) 820-6856
Dr. Susan Andrew, MD
Dickinson, TX · $701 in drug and device payments (2025) · Telehealth · (281) 910-1982
Dr. Ward Prentice, PA C
Dickinson, TX · $4,785 in drug and device payments (2025) · (281) 337-1512
Dr. Adrian Casillas, MD
El Paso, TX · $924 in drug and device payments (2025) · (915) 320-3854
Dr. Qing Wang, MD
Fort Hood, TX · No drug or device payments recorded (2025) · (254) 285-6335
Dr. James Quinn, M.D.
Fort Sam Houston, TX · $31 in drug and device payments (2025) · (210) 539-9582
Dr. James Haden, M.D.
Fort Worth, TX · $1,189 in drug and device payments (2025) · (817) 336-8855
Dr. Jennifer Mccracken, MD
Galveston, TX · $2,876 in drug and device payments (2025) · (409) 772-3410
Dr. John Grant, MD
Galveston, TX · $232 in drug and device payments (2025) · (409) 772-2436
Dr. Julia Tripple, M.D.
Galveston, TX · $47 in drug and device payments (2025) · Telehealth · (409) 772-3410
Dr. Mary Ann Miranda, MD
Harker Heights, TX · $250 in drug and device payments (2025) · (254) 435-4995
Dr. Albert Wu, MD
Houston, TX · $177 in drug and device payments (2025) · (713) 442-0000
Dr. Christopher Codispoti, MD, PHD
Houston, TX · $1,767 in drug and device payments (2025) · (713) 486-0340
Dr. David Huston, M.D.
Houston, TX · $114 in drug and device payments (2025) · (713) 441-0006
Dr. Ekta Perera, MD
Houston, TX · $63,390 in drug and device payments (2025) · Telehealth · (713) 500-6876
Dr. Johnny Nguyen, DO
Houston, TX · $448 in drug and device payments (2025) · (832) 688-9463
Dr. Julie Patel, M.D.
Houston, TX · $2,092 in drug and device payments (2025) · Telehealth · (713) 790-0900
Dr. Mahboobeh Mahdavinia
Houston, TX · $14,012 in drug and device payments (2025) · Telehealth · (713) 486-0340
Dr. Muhammad Imran, MD
Houston, TX · $863 in drug and device payments (2025) · (832) 648-7779
Dr. Pankaj Shah, M.D.
Houston, TX · $511 in drug and device payments (2025) · (713) 541-6700
Dr. Sadhana Balasubramanyam, MD
Houston, TX · $7,617 in drug and device payments (2025) · Telehealth · (713) 441-4447
Dr. Saffana Hassan, M.D.
Houston, TX · No drug or device payments recorded (2025) · (713) 869-4405
Dr. Sana Hasan, M.D.
Houston, TX · $19 in drug and device payments (2025) · (713) 500-6525
Dr. Sanjiv Sur, MD
Houston, TX · $285 in drug and device payments (2025) · Telehealth · (713) 873-8890
Dr. Sara Anvari, M.D.
Houston, TX · $7,229 in drug and device payments (2025) · (832) 824-1319
Dr. Sarah Nicholas, MD
Houston, TX · $6,165 in drug and device payments (2025) · (832) 824-1000
Dr. Sebastian Ochoa Gonzalez, M.D.
Houston, TX · $169 in drug and device payments (2025) · (832) 822-2096
Dr. Thomas Woehler, M.D.
Houston, TX · No drug or device payments recorded (2025) · (713) 862-6888
Dr. Xuesong Chen, M.D.
Houston, TX · No drug or device payments recorded (2025) · (713) 791-1414
Dr. Nicole Christians, MD
League City, TX · $894 in drug and device payments (2025) · (800) 917-8906
Dr. Goutam Shome, M.D.
Lubbock, TX · $2,471 in drug and device payments (2025) · (806) 725-8420
Dr. James Tarbox, MD
Lubbock, TX · $8,161 in drug and device payments (2025) · (806) 743-3150
Dr. Srividya Sridhara, M.D
Murphy, TX · $2,827 in drug and device payments (2025) · (972) 521-3366
Dr. Aasia Ghazi, M.D.
Plano, TX · $2,696 in drug and device payments (2025) · Telehealth · (972) 636-1750
Dr. Alfred Johnson, D.O.
Richardson, TX · $171 in drug and device payments (2025) · Telehealth · (972) 479-0400
Dr. Karim Dhanani, MD
Round Rock, TX · $2,267 in drug and device payments (2025) · Telehealth · (512) 509-3526
Dr. Alan Boyar, M.D.
San Antonio, TX · No drug or device payments recorded (2025) · (210) 436-8400
Dr. Charles Calais, D.O
San Antonio, TX · $1,080 in drug and device payments (2025) · (210) 226-3500
Dr. Michael Adame, MD
San Antonio, TX · $6,200 in drug and device payments (2025) · (210) 864-0494

Common questions

How many Allergy & Immunology (Internal Medicine) providers are in Texas?

There are 49 Allergy & Immunology (Internal Medicine) providers with active NPI records practicing in Texas, according to federal NPPES data refreshed monthly.

Do Allergy & Immunology (Internal Medicine) providers in Texas offer telehealth?

Yes. 16 of the 49 Allergy & Immunology (Internal Medicine) providers in Texas (about 33%) report offering telehealth services in CMS data.

Which cities in Texas have the most Allergy & Immunology (Internal Medicine) providers?

Houston (18), Dallas (5), Galveston (3) have the highest concentration of Allergy & Immunology (Internal Medicine) providers in Texas.

How many Allergy & Immunology (Internal Medicine) providers in Texas received drug or device company payments?

40 of 49 Allergy & Immunology (Internal Medicine) providers in Texas (82%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program.

Where does this data come from?

Provider counts and profiles come from the federal NPPES registry and CMS Doctors and Clinicians files. Payment figures come from the CMS Open Payments program for calendar year 2025. The directory refreshes monthly.

Do most Allergists (Internal Medicine) in Texas work in independent practices or large health systems?

Among 34 Allergists (Internal Medicine) in Texas enrolled in Medicare, 29% bill through a solo or small practice with fewer than 10 clinicians, 0% through a mid-size group of 10 to 99, and 71% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.

Which hospitals do Allergists (Internal Medicine) in Texas work at?

According to CMS facility affiliation records, the Texas hospitals where the most Allergists (Internal Medicine) hold privileges are University of Texas Medical Branch Galveston in Galveston; Ut of Texas Southwestern University Hospital - William P. Clements Jr. in Dallas; Memorial Hermann - Texas Medical Center in Houston.

Related reading on HealthcareDiscovery.AI

Allergy & Immunology (Internal Medicine) in all 50 states Search all 49 in the directory Ask Zach for help choosing

Related

Try a city like Tucson, a zip like 85016, or a specialty like psychiatry. For a doctor by name, use the full search.
Sources: NPPES (CMS), Doctors and Clinicians national files, CMS Open Payments 2025. Updated monthly. Records are public federal data and are not verified credentials, licensure checks, or endorsements. This directory is informational and not medical advice. How we build this directory. Are you a Allergy & Immunology (Internal Medicine) in Texas? Get featured.