Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Diane Duyen T Nguyen, DO

Individual provider Hematology & Oncology Physician · NPI 1023233756

Diane Duyen T Nguyen, DO practises Medical Oncology in McAllen, Texas. Graduated from West Virginia School of Osteopathic Medicine in 2001, 25 years ago. Practices with The University of Texas Rio Grande Valley, a 83-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in Tennessee and Texas.

Years since qualifying
25
Trained at
West Virginia School of Osteopathic Medicine
Licensed in
TN, TX
In the registry since
2007
Specialties on file
3
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

205 E Toronto Ave
McAllen, TX 78503-1209
Phone: (956) 296-3990
Fax: (956) 665-6837
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 27700 Northwest Fwy Ste 580, Cypress, TX 77433-6766 — (832) 791-5530
  • 602 Indiana Ave, Lubbock, TX 79415-3364 — (806) 775-8600

Specialties & licences

Medical Oncology Physician (primary) Taxonomy 207RX0202X · Licence M3045 (TX)
Hematology & Oncology Physician Taxonomy 207RH0003X · Licence DO1698 (TN)
Hematology & Oncology Physician Taxonomy 207RH0003X · Licence M3045 (TX)

Record details

NPI number1023233756
Entity typeIndividual (Type 1)
GenderFemale
Credentials DO
Sole proprietorNo
NPI enumeratedApril 16, 2007
Last updated in NPPESOctober 3, 2024
Certification dateOctober 3, 2024

Medicare enrollment

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

Medicare specialtyMEDICAL ONCOLOGY
Also practisesHEMATOLOGY
Medical schoolWEST VIRGINIA SCHOOL OF OSTEOPATHIC MEDICINE
Graduated 2001 (25 years in practice)
Group practice The University Of Texas Rio Grande Valley — 83 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients20
Services billed 232 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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.

Education $200 2 payments · educational material or training, not a fee
Food and Beverage $151 2 payments · a meal or drink at a meeting or visit, 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.

Colleagues at The University of Texas Rio Grande Valley

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 83 clinicians in the practice; 12 are shown here.

Other providers in McAllen