Mark Nicholas Ziats, MD, PHD
NPI 1356790091ActiveIndividual· Internal Medicine· Fort Worth, TX
Internal Medicine (MD, PHD) in Fort Worth, Texas, trained at Baylor College of Medicine (class of 2015). Their prescriptions cost Medicare Part D more than their services did: $305,413 for 4,550 claims, against $126,819 paid for services in 2024. Lilly USA, LLC was the largest of 2 companies reporting payments in 2025, $34.12 in all, mostly food and beverage.
Overview
| NPI | 1356790091 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD, PHD |
| Sole proprietor | No |
| NPI issued | Jun 3, 2016 |
| Last updated in NPPES | Jan 17, 2024 |
| Certified by provider | Jan 17, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | MD52161 | SC |
| Hospitalist | 208M00000X | 52161 | SC |
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 - Internal Medicine (MT); Practitioner - Hospitalist (SC); Practitioner - Internal Medicine (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 417 |
|---|---|
| Services billed | 2,705 across 45 procedure codes |
| Paid by Medicare | $126,819 |
Part D prescriptions in 2024
| Prescriptions (claims) | 4,550 · 9,900 30-day fills |
|---|---|
| Patients | 760 |
| Total drug cost | $305,413 |
| Generic share | 90% of claims |
Education and affiliations
| Medical school | Baylor College of Medicine |
|---|---|
| Graduation year | 2015 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Texas Health Care PLLCWillow Park, TX · 371 clinicians
- Brazos Physician Services, PAGranbury, TX · 9 clinicians
Hospital affiliations
- Lake Granbury Medical CenterGranbury, TX
- Medical City WeatherfordWeatherford, TX
- Texas Health Harris Methodist Fort WorthFort Worth, TX
- Texas Health Harris Methodist Hospital Southwest FFort Worth, TX
- Ut of Texas Southwestern University Hospital - William P. Clements Jr.Dallas, TX
Other facilities
- Amatus Health Care LLCHome health agency · Farmers Branch, TX
- Dfw Home HealthHome health agency · Fort Worth, TX
- Enhabit Home HealthHome health agency · Fort Worth, TX
- Frontier Home HealthHome health agency · Benbrook, TX
- Restoring Function Hhc LLCHome health agency · Burleson, TX
- Frontier HospiceHospice · Benbrook, TX
- The Stayton at Museum WayNursing home · Fort Worth, TX
- Trinity TerraceNursing home · Fort Worth, TX
Industry payments (Open Payments)
- 2025$34.12 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lilly USA, LLC | $17.78 | 1 |
| Abbvie Inc. | $16.34 | 1 |
What the 2025 payments were for
- Food and Beverage$34.12 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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