Nathaniel J. Fullerton, MD
NPI 1366417461ActiveIndividual· Internal Medicine· Fort Atkinson, WI
Internal Medicine (MD) in Fort Atkinson, Wisconsin, trained at University of Wisconsin School of Medicine (class of 1995). Their prescriptions cost Medicare Part D more than their services did: $67,707 for 1,485 claims, against $16,588 paid for services in 2024.
Overview
| NPI | 1366417461 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Feb 22, 2006 |
| Last updated in NPPES | Apr 11, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 38510-20 | 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 - Internal Medicine (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 93 |
|---|---|
| Services billed | 261 across 14 procedure codes |
| Paid by Medicare | $16,588 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,485 · 1,515 30-day fills |
|---|---|
| Patients | 95 |
| Total drug cost | $67,707 |
| Generic share | 83% of claims |
Education and affiliations
| Medical school | University of Wisconsin School of Medicine |
|---|---|
| Graduation year | 1995 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Hospitalist |
Medical groups
- Agnesian Healthcare IncWaupun, WI · 388 clinicians
- Informe Healthcare Il LLCRockford, IL · 23 clinicians
Hospital affiliations
- Ripon Medical CenterRipon, WI
- Ssm Health St Agnes Hospital-Fond Du LacFond Du Lac, WI
- Waupun Memorial HospitalWaupun, WI
Other facilities
- Select Specialty Hospital MadisonLong-term care hospital · Madison, WI
- Rock River Nursing & RehabNursing home · Fort Atkinson, WI
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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