John Thomas Gregg, M. D.
NPI 1184605917ActiveIndividual· Surgery· Alva, OK
Surgery (M. D.) in Alva, Oklahoma, licensed in OK and TX, with an NPI issued in November 2005. 189 Medicare patients in 2024, $23,273 paid; nearly all of their 82 Part D prescriptions were generic (96%). Vertex Pharmaceuticals Incorporated reported $27.62 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1184605917 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M. D. |
| Sole proprietor | Yes |
| NPI issued | Nov 9, 2005 |
| Last updated in NPPES | Aug 31, 2021 |
| Certified by provider | Jun 29, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Surgery Primary | 208600000X | 17854 | OK |
| Emergency Medicine | 207P00000X | 17854 | OK |
| Emergency Medicine | 207P00000X | H5890 | TX |
| Surgery | 208600000X | H5890 | 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 - Emergency Medicine (OK); Practitioner - General Surgery (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 189 |
|---|---|
| Services billed | 264 across 29 procedure codes |
| Paid by Medicare | $23,273 |
Part D prescriptions in 2024
| Prescriptions (claims) | 82 · 84 30-day fills |
|---|---|
| Patients | 55 |
| Total drug cost | $722.46 |
| Generic share | 96% of claims |
Industry payments (Open Payments)
- 2025$27.62 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Vertex Pharmaceuticals Incorporated | $27.62 | 1 |
What the 2025 payments were for
- Food and Beverage$27.62 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records