Mazen Hassan, MD
NPI 1003311093ActiveIndividual· Internal Medicine· Dallas, TX
Internal Medicine (MD) in Dallas, Texas, trained at University of Texas Medical School at San Antonio (class of 2018). 203 Medicare patients in 2024, $35,727 paid; nearly all of their 73 Part D prescriptions were generic (93%). Aop Health US, LLC was the largest of 12 companies reporting payments in 2025, $1,983 in all, mostly food and beverage.
Overview
| NPI | 1003311093 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Mar 29, 2018 |
| Last updated in NPPES | Mar 3, 2023 |
| Certified by provider | Mar 3, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | S7228 | TX |
| General Practice | 208D00000X | S7228 | TX |
| Hospitalist | 208M00000X | S7228 | 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 - Internal Medicine (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 203 |
|---|---|
| Services billed | 453 across 13 procedure codes |
| Paid by Medicare | $35,727 |
Part D prescriptions in 2024
| Prescriptions (claims) | 73 · 78 30-day fills |
|---|---|
| Patients | 32 |
| Total drug cost | $2,776 |
| Generic share | 93% of claims |
Education and affiliations
| Medical school | University of Texas Medical School at San Antonio |
|---|---|
| Graduation year | 2018 |
| Medicare specialty | Internal Medicine |
Medical group
- Healthtexas Provider NetworkWaxahachie, TX · 2,697 clinicians
Hospital affiliations
- Baylor Scott & White Heart & Vascular Hospital - DallasDallas, TX
- Baylor University Medical CenterDallas, TX
Other facilities
- Texas Home Health Group of Desoto, LLCHome health agency · Desoto, TX
- Baylor Scott & White Institute for RehabilitationInpatient rehabilitation facility · Dallas, TX
Industry payments (Open Payments)
- 2025$1,983 · 46 payments from 12 companies
- 2024$1,271 · 55 payments from 14 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Aop Health US, LLC | $884.92 | 1 |
| Pfizer Inc. | $370.22 | 13 |
| Alexion Pharmaceuticals, Inc. | $125.08 | 5 |
| Aimmune Therapeutics, Inc. | $112.72 | 5 |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $111.70 | 6 |
What the 2025 payments were for
- Food and Beverage$1,983 · 46 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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