Hayden N. Hemphill, MD
NPI 1396746376ActiveIndividual· Internal Medicine, Nephrology· Texarkana, TX
Internal Medicine, Nephrology (MD) in Texarkana, Texas, trained at University of Texas Medical School at Houston (class of 1997). 550 Medicare patients in 2024, $248,614 paid; nearly all of their 1,526 Part D prescriptions were generic (90%). Calliditas Therapeutics US Inc. was the largest of 12 companies reporting payments in 2025, $685.73 in all, mostly food and beverage.
Overview
| NPI | 1396746376 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 2, 2005 |
| Last updated in NPPES | Sep 16, 2026 |
| Certified by provider | Sep 16, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | L3996 | TX |
| Internal Medicine, Nephrology | 207RN0300X | E3289 | AR |
| Internal Medicine, Nephrology | 207RN0300X | 23061 | OK |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Nephrology (AR); Practitioner - Nephrology (OK); Practitioner - Nephrology (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 550 |
|---|---|
| Services billed | 5,015 across 72 procedure codes |
| Paid by Medicare | $248,614 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,526 · 2,854 30-day fills |
|---|---|
| Patients | 274 |
| Total drug cost | $134,966 |
| Generic share | 90% of claims |
Education and affiliations
| Medical school | University of Texas Medical School at Houston |
|---|---|
| Graduation year | 1997 |
| Medicare specialty | Nephrology |
Medical groups
- Christus Trinity Clinic TexasTyler, TX · 1,540 clinicians
- Collom and Carney Clinic AssociationTexarkana, TX · 51 clinicians
Hospital affiliations
- Christus St Michael Health SystemTexarkana, TX
- Howard Memorial HospitalNashville, AR
- McCurtain Memorial HospitalIdabel, OK
Other facilities
- Davita Hempstead County DialysisDialysis facility · Hope, AR
- Davita Miller County DialysisDialysis facility · Texarkana, AR
- Davita Northeast Texas DialysisDialysis facility · Atlanta, TX
- Davita Texarkana Regional DialysisDialysis facility · Texarkana, TX
- Davita Twin CitiesDialysis facility · Texarkana, AR
- Christus St Michael Health SystemInpatient rehabilitation facility · Texarkana, TX
Industry payments (Open Payments)
- 2025$685.73 · 31 payments from 12 companies
- 2024$772.51 · 36 payments from 14 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Calliditas Therapeutics US Inc. | $151.47 | 6 |
| Bayer Healthcare Pharmaceuticals Inc. | $136.41 | 8 |
| Ardelyx, Inc. | $90.61 | 3 |
| Astrazeneca Pharmaceuticals LP | $66.78 | 4 |
| Novartis Pharmaceuticals Corporation | $42.46 | 1 |
What the 2025 payments were for
- Food and Beverage$685.73 · 31 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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