Rex B. Williams, M.D.
NPI 1821034596ActiveIndividual· Anesthesiology, Pain Medicine· Starkville, MS
Anesthesiology, Pain Medicine (M.D.) in Starkville, Mississippi, trained at Mississippi Medical College (class of 2001). In 2024 Medicare paid $498,806 for 925 patients, and Part D covered 664 of their prescriptions, 89% of them generic. Salix Pharmaceuticals, A Division of Bausch Health US, LLC was the largest of 9 companies reporting payments in 2025, $562.64 in all, mostly food and beverage.
Overview
| NPI | 1821034596 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 21, 2006 |
| Last updated in NPPES | Oct 6, 2025 |
| Certified by provider | Oct 6, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Anesthesiology, Pain Medicine Primary | 207LP2900X | 19128 | MS |
| Anesthesiology, Pain Medicine | 207LP2900X | ME92922 | FL |
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 - Pain Management (AL); Practitioner - Interventional Pain Management (GA); Practitioner - Pain Management (MS) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 925 |
|---|---|
| Services billed | 23,731 across 46 procedure codes |
| Paid by Medicare | $498,806 |
Part D prescriptions in 2024
| Prescriptions (claims) | 664 · 829 30-day fills |
|---|---|
| Patients | 81 |
| Total drug cost | $31,195 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | Mississippi Medical College |
|---|---|
| Graduation year | 2001 |
| Medicare specialty | Pain Management |
| Secondary specialties | Anesthesiology |
Medical groups
- Russellville Hospital Inc.Russellville, AL · 45 clinicians
- Och Professional ServicesStarkville, MS · 30 clinicians
- Ms Pain Institute Oxford PLLCOxford, MS · 5 clinicians
Hospital affiliations
- Baptist Memorial Hospital-Oktibbeha CountyStarkville, MS
- Russellville HospitalRussellville, AL
Industry payments (Open Payments)
- 2025$562.64 · 29 payments from 9 companies
- 2024$2,056 · 40 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $270.25 | 16 |
| Scilex Pharmaceuticals Inc. | $63.27 | 3 |
| Si-Bone, Inc. | $50.25 | 2 |
| Stryker Corporation | $47.80 | 1 |
| Saluda Medical Americas, Inc. | $38.99 | 2 |
What the 2025 payments were for
- Food and Beverage$562.64 · 29 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records