William Kellar Winkelmeyer, M.D.
NPI 1316943475ActiveIndividual· Internal Medicine, Nephrology· Columbia, MO
Internal Medicine, Nephrology (M.D.) with Nephrology and Hypertension Associates, practicing in Columbia, Missouri. Their prescriptions cost Medicare Part D more than their services did: $392,249 for 7,458 claims, against $208,992 paid for services in 2024. Amgen Inc. reported $23.72 in payments in 2025, mostly food and beverage. Lists Boone Hospital Center and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1316943475 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 23, 2005 |
| Last updated in NPPES | Oct 5, 2022 |
| Certified by provider | Oct 5, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 36326 | MO |
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 - Nephrology (MO) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 630 |
|---|---|
| Services billed | 2,389 across 25 procedure codes |
| Paid by Medicare | $208,992 |
Part D prescriptions in 2024
| Prescriptions (claims) | 7,458 · 16,334 30-day fills |
|---|---|
| Patients | 620 |
| Total drug cost | $392,249 |
| Generic share | 93% of claims |
Education and affiliations
| Graduation year | 1981 |
|---|---|
| Medicare specialty | Nephrology |
Medical group
- Nephrology and Hypertension AssociatesColumbia, MO · 7 clinicians
Hospital affiliations
- Boone Hospital CenterColumbia, MO
- Bothwell Regional Health CenterSedalia, MO
- Macon County Samaritan Memorial HospitalMacon, MO
- Moberly Regional Medical CenterMoberly, MO
- University of Missouri Health CareColumbia, MO
Other facilities
- Davita Columbia Home TrainingDialysis facility · Columbia, MO
- Davita Rtc-Columbia DialysisDialysis facility · Columbia, MO
- Dialysis Clinics, Inc - ColumbiaDialysis facility · Columbia, MO
- Dialysis Clinics, Inc - MoberlyDialysis facility · Moberly, MO
- Dialysis Clinics, Inc - Osage BeachDialysis facility · Osage Beach, MO
Industry payments (Open Payments)
- 2025$23.72 · 1 payment from 1 company
- 2024$22.52 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $23.72 | 1 |
What the 2025 payments were for
- Food and Beverage$23.72 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 35 nephrologists in Columbia · All nephrologists in Missouri