Amelia L. Zellner, APNP
NPI 1851724520ActiveIndividual· Nurse Practitioner· Marshfield, WI
Nurse Practitioner (APNP) with Oak Medical SC, practicing in Marshfield, Wisconsin. Their prescriptions cost Medicare Part D more than their services did: $169,416 for 2,947 claims, against $77,802 paid for services in 2024. Otsuka America Pharmaceutical, Inc. reported $157.98 in payments in 2025, mostly food and beverage. Lists Marshfield Medical Center as a hospital affiliation.
Overview
| NPI | 1851724520 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | APNP |
| Sole proprietor | No |
| NPI issued | Aug 16, 2013 |
| Last updated in NPPES | Jun 24, 2026 |
| Certified by provider | Jun 24, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner Primary | 363L00000X | 5381 | WI |
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 - Nurse Practitioner (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 147 |
|---|---|
| Services billed | 914 across 9 procedure codes |
| Paid by Medicare | $77,802 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,947 · 2,996 30-day fills |
|---|---|
| Patients | 245 |
| Total drug cost | $169,416 |
| Generic share | 74% of claims |
Education and affiliations
| Graduation year | 2013 |
|---|---|
| Medicare specialty | Nurse Practitioner |
Medical group
- Oak Medical SCLodi, WI · 123 clinicians
Hospital affiliation
- Marshfield Medical CenterMarshfield, WI
Industry payments (Open Payments)
- 2025$157.98 · 2 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Otsuka America Pharmaceutical, Inc. | $157.98 | 2 |
What the 2025 payments were for
- Food and Beverage$157.98 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 56 nurse practitioners in Marshfield · All nurse practitioners in Wisconsin