Mark W. Sij, D.O.
NPI 1396705919ActiveIndividual· Internal Medicine· Kaufman, TX
Internal Medicine (D.O.) in Kaufman, Texas, trained at University of North Texas Hsc, College of Osteopathic Med (class of 1998). Their prescriptions cost Medicare Part D more than their services did: $1,716,939 for 24,152 claims, against $80,108 paid for services in 2024. Abbvie Inc. was the largest of 26 companies reporting payments in 2025, $2,354 in all, mostly food and beverage.
Overview
| NPI | 1396705919 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Mar 27, 2006 |
| Last updated in NPPES | Aug 5, 2011 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | K9421 | 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 - Internal Medicine (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 990 |
|---|---|
| Services billed | 6,760 across 34 procedure codes |
| Paid by Medicare | $80,108 |
Part D prescriptions in 2024
| Prescriptions (claims) | 24,152 · 45,027 30-day fills |
|---|---|
| Patients | 1,270 |
| Total drug cost | $1,716,939 |
| Generic share | 90% of claims |
Education and affiliations
| Medical school | University of North Texas Hsc, College of Osteopathic Med |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Texas Health Physicians GroupFort Worth, TX · 1,365 clinicians
Hospital affiliations
- Texas Health Presbyterian Hospital DallasDallas, TX
- Texas Health Presbyterian Hospital KaufmanKaufman, TX
- Ut Health East Texas Athens HospitalAthens, TX
Other facilities
- American Home CareHome health agency · Terrell, TX
- Angels Care Home HealthHome health agency · Royse City, TX
- Centerwell Home HealthHome health agency · Temple, TX
- Your Health Team LLCHome health agency · Kaufman, TX
- Always Accurate Home Healthcare and Hospice LLCHospice · Kaufman, TX
- Baylor Scott & White Institute for RehabilitationInpatient rehabilitation facility · Dallas, TX
Industry payments (Open Payments)
- 2025$2,354 · 121 payments from 26 companies
- 2024$2,065 · 124 payments from 26 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $415.98 | 28 |
| Astrazeneca Pharmaceuticals LP | $238.81 | 13 |
| Pfizer Inc. | $237.23 | 10 |
| Corcept Therapeutics | $193.66 | 5 |
| Novo Nordisk Inc | $153.40 | 9 |
What the 2025 payments were for
- Food and Beverage$2,354 · 121 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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