John M. Willis, DO
NPI 1205891207ActiveIndividual· Internal Medicine· Mansfield, TX
Internal Medicine (DO) in Mansfield, Texas, trained at University of North Texas Hsc, College of Osteopathic Med (class of 1990). Their prescriptions cost Medicare Part D more than their services did: $923,147 for 8,685 claims, against $58,333 paid for services in 2024. Abbott Laboratories was the largest of 10 companies reporting payments in 2025, $543.79 in all, mostly food and beverage.
Overview
| NPI | 1205891207 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | Apr 20, 2006 |
| Last updated in NPPES | Mar 23, 2022 |
| Certified by provider | Mar 23, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | J0366 | TX |
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 - Internal Medicine (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 219 |
|---|---|
| Services billed | 851 across 32 procedure codes |
| Paid by Medicare | $58,333 |
Part D prescriptions in 2024
| Prescriptions (claims) | 8,685 · 20,854 30-day fills |
|---|---|
| Patients | 535 |
| Total drug cost | $923,147 |
| Generic share | 88% of claims |
Education and affiliations
| Medical school | University of North Texas Hsc, College of Osteopathic Med |
|---|---|
| Graduation year | 1990 |
| Medicare specialty | Internal Medicine |
Medical group
- MedhealthDallas, TX · 450 clinicians
Hospital affiliation
- Methodist Mansfield Medical CenterMansfield, TX
Industry payments (Open Payments)
- 2025$543.79 · 26 payments from 10 companies
- 2024$386.37 · 19 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbott Laboratories | $98.60 | 4 |
| Lilly USA, LLC | $96.36 | 5 |
| Pfizer Inc. | $78.11 | 3 |
| Astrazeneca Pharmaceuticals LP | $60.35 | 3 |
| Novo Nordisk Inc | $57.31 | 3 |
What the 2025 payments were for
- Food and Beverage$543.79 · 26 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 47 internal medicine physicians in Mansfield · All internal medicine physicians in Texas