DIANE DUYEN T NGUYEN DO
NPI 1023233756
Internal Medicine - Medical Oncology in Mcallen, TX
About Diane Duyen T Nguyen Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DIANE DUYEN T NGUYEN DO (NPI 1023233756) is an individual medical oncology provider in Mcallen, Texas, licensed in Texas (M3045) and active in the NPI registry since April 2007. She is enrolled in Medicare PECOS, is affiliated with South Texas Health System, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 2
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Diane Duyen T Nguyen Do is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Diane Duyen Nguyen reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Edinburg, TX 78542
- Reassigned Medicare billing, Texas enrollment
- 96 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
South Texas Health System
Acute Care Hospitals · Edinburg, TXRio Grande Regional Hospital
Acute Care Hospitals · Mcallen, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 78503 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MCALLEN, TX 78503
MCALLEN, TX 78503
MCALLEN, TX 78503
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 Diane Duyen Nguyen's NPI number?
The NPI number for Diane Duyen Nguyen is 1023233756. It was assigned to this individual provider in the NPPES registry on April 16, 2007.
Where is Diane Duyen Nguyen located?
Diane Duyen Nguyen practices at 205 E Toronto Ave, Mcallen, TX 78503. The listed phone number is (956) 296-3990.
What is Diane Duyen Nguyen's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.
Is Diane Duyen Nguyen enrolled in Medicare?
Yes. Diane Duyen Nguyen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Diane Duyen Nguyen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Diane Duyen Nguyen reassigns Medicare benefits to University Of Texas Rio Grande Valley (Edinburg, TX). The 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 Diane Duyen Nguyen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Diane Duyen Nguyen accept?
Health plans from Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Superior HealthPlan and Ambetter of Oklahoma and 2 other insurers list Diane Duyen Nguyen 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.
Is Diane Duyen Nguyen affiliated with any hospitals?
According to CMS data, Diane Duyen Nguyen is affiliated with South Texas Health System and Rio Grande Regional Hospital.
When was this NPI record last updated?
The NPPES record for Diane Duyen Nguyen was last updated on October 3, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Diane Duyen T Nguyen, DO · NPI 1023233756
Medical Oncology physician in Mcallen, Texas. Individual provider, active in the CMS NPPES registry since April 16, 2007.
## Identity
- **NPI:** 1023233756 (Entity type: Individual)
- **Enumerated:** April 16, 2007
- **Primary specialty:** Internal Medicine - Medical Oncology · taxonomy 207RX0202X
- **State license:** M3045 (Texas)
- **Sole proprietor:** No
## Practice location
- **Address:** 205 E TORONTO AVE, Mcallen, TX 78503-1209
- **Phone:** (956) 296-3990 · **Fax:** (956) 665-6837
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** University Of Texas Rio Grande Valley (NPI 1811436504, Edinburg, TX), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** West Virginia School Of Osteopathic Medicine, class of 2001
## Record status
- **NPPES last updated:** October 3, 2024
- **Other identifiers:** Other 4155051 (TN)
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Source: [NPI Profile](https://npiprofile.com/npi/1023233756) · Data from the CMS NPPES public registry.