David Collier Williams, M.D.
NPI 1518991264ActiveIndividual· Internal Medicine, Nephrology· Norman, OK
Internal Medicine, Nephrology (M.D.) in Norman, Oklahoma, trained at Des Moines University of Osteopathic Medicine and Health Sciences (class of 2001). Their prescriptions cost Medicare Part D more than their services did: $287,837 for 1,253 claims, against $168,419 paid for services in 2024. Amgen Inc. was the largest of 11 companies reporting payments in 2025, $625.13 in all, mostly food and beverage.
Overview
| NPI | 1518991264 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Jul 10, 2006 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 22399 | OK |
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 - Nephrology (OK) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 521 |
|---|---|
| Services billed | 1,752 across 19 procedure codes |
| Paid by Medicare | $168,419 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,253 · 2,911 30-day fills |
|---|---|
| Patients | 204 |
| Total drug cost | $287,837 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | Des Moines University of Osteopathic Medicine and Health Sciences |
|---|---|
| Graduation year | 2001 |
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
Medical group
- Norman Regional Providers Specialty CareNorman, OK · 142 clinicians
Hospital affiliations
- Harmon Memorial HospitalHollis, OK
- Lindsay Municipal HospitalLindsay, OK
- Mercy Hospital AdaAda, OK
- Norman RegionalNorman, OK
- Purcell Municipal HospitalPurcell, OK
Other facilities
- Davita Cleveland PdDialysis facility · Oklahoma City, OK
- Davita Moore DialysisDialysis facility · Moore, OK
- Davita Norman Dialysis CenterDialysis facility · Norman, OK
- Davita Rose Rock DialysisDialysis facility · Oklahoma City, OK
- Davita Sooner DialysisDialysis facility · Norman, OK
Industry payments (Open Payments)
- 2025$625.13 · 33 payments from 11 companies
- 2024$774.06 · 46 payments from 10 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $145.08 | 13 |
| Astrazeneca Pharmaceuticals LP | $93.27 | 5 |
| Impulse Dynamics (USA) Inc. | $89.12 | 3 |
| Cormedix Inc. | $53.63 | 2 |
| Otsuka America Pharmaceutical, Inc. | $45.43 | 2 |
What the 2025 payments were for
- Food and Beverage$625.13 · 33 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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