Stefanie M. Diaz, M.D.
NPI 1689723637ActiveIndividual· Internal Medicine, Nephrology· Tyler, TX
Internal Medicine, Nephrology (M.D.) with Etmc Physician Group, Inc. and 1 other group, practicing in Tyler, Texas. 414 Medicare patients in 2024, $124,398 paid; nearly all of their 1,026 Part D prescriptions were generic (93%). Polynovo North America LLC was the largest of 8 companies reporting payments in 2025, $446.14 in all, mostly food and beverage. Lists Christus Mother Frances Hospital and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1689723637 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jan 9, 2007 |
| Last updated in NPPES | Apr 20, 2023 |
| Certified by provider | Apr 20, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | K8739 | TX |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Nephrology (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 414 |
|---|---|
| Services billed | 2,133 across 28 procedure codes |
| Paid by Medicare | $124,398 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,026 · 1,754 30-day fills |
|---|---|
| Patients | 180 |
| Total drug cost | $138,206 |
| Generic share | 93% of claims |
Education and affiliations
| Graduation year | 1992 |
|---|---|
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Etmc Physician Group, Inc.Flint, TX · 381 clinicians
- Tyler Nephrology Associates PATyler, TX · 27 clinicians
Hospital affiliations
- Christus Mother Frances HospitalTyler, TX
- Christus Mother Frances Hospital Sulphur SpringsSulphur Springs, TX
- Ut Health East Texas Athens HospitalAthens, TX
- Ut Health East Texas Jacksonville HospitalJacksonville, TX
- Ut Health East Texas Tyler Regional HospitalTyler, TX
Other facilities
- Fresenius Medical Care Tyler Home DialysisDialysis facility · Tyler, TX
- Renal Care Group Sulphur SpringsDialysis facility · Sulphur Springs, TX
- Christus Trinity Mother Frances Rehab, A Partner OInpatient rehabilitation facility · Tyler, TX
Industry payments (Open Payments)
- 2025$446.14 · 11 payments from 8 companies
- 2024$66.73 · 3 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Polynovo North America LLC | $183.65 | 2 |
| Amgen Inc. | $111.06 | 1 |
| Otsuka America Pharmaceutical, Inc. | $28.71 | 1 |
| Fresenius USA Marketing, Inc. | $25.41 | 1 |
| Travere Therapeutics, Inc. | $25.16 | 2 |
What the 2025 payments were for
- Food and Beverage$446.14 · 11 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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