Mark Urtal Liong, M.D.
NPI 1346422078ActiveIndividual· Internal Medicine, Nephrology· McAllen, TX
Internal Medicine, Nephrology (M.D.) with South Texas Kidney Specialists, P.A., practicing in McAllen, Texas. Their prescriptions cost Medicare Part D more than their services did: $1,137,966 for 1,355 claims, against $143,633 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 6 companies reporting payments in 2025, $408.50 in all, mostly food and beverage. Lists Doctors Hosptal at Renaissance and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1346422078 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Dec 5, 2007 |
| Last updated in NPPES | Jan 8, 2015 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | P4673 | 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 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 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 | 245 |
|---|---|
| Services billed | 1,089 across 14 procedure codes |
| Paid by Medicare | $143,633 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,355 · 1,973 30-day fills |
|---|---|
| Patients | 221 |
| Total drug cost | $1,137,966 |
| Generic share | 59% of claims |
Education and affiliations
| Graduation year | 2004 |
|---|---|
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
Medical group
- South Texas Kidney Specialists, P.A.McAllen, TX · 15 clinicians
Hospital affiliations
- Doctors Hosptal at RenaissanceEdinburg, TX
- Knapp Medical CenterWeslaco, TX
- South Texas Health SystemEdinburg, TX
Other facilities
- Davita Weslaco Renal CenterDialysis facility · Weslaco, TX
- Fkc McAllen HomeDialysis facility · Edinburg, TX
- Fkc Mid-ValleyDialysis facility · Weslaco, TX
- Weslaco Dialysis FacilityDialysis facility · Weslaco, TX
- Edinburg Regional Medical CtrInpatient rehabilitation facility · Edinburg, TX
Industry payments (Open Payments)
- 2025$408.50 · 16 payments from 6 companies
- 2024$649.00 · 27 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $143.72 | 7 |
| Mallinckrodt Hospital Products Inc. | $98.12 | 1 |
| Bayer Healthcare Pharmaceuticals Inc. | $84.10 | 4 |
| Akebia Therapeutics Inc | $41.46 | 2 |
| Fresenius USA Marketing, Inc. | $24.90 | 1 |
What the 2025 payments were for
- Food and Beverage$408.50 · 16 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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