Quick answers
- Which hospitals does Nathaniel J. Fullerton work at?
- Medicare's official clinician data lists Nathaniel J. Fullerton at 3 hospitals: Ripon Medical Center, SSM Health St Agnes Hospital-Fond Du Lac and Waupun Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Nathaniel J. Fullerton see patients?
- Medicare's clinician data lists 2 practice locations, including Waupun, WI and Madison, WI. Call before your visit to confirm the address.
- What is Nathaniel J. Fullerton's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also Hospitalist.
- Does Nathaniel J. Fullerton accept Medicare assignment?
- Yes. Medicare's clinician data says Nathaniel J. Fullerton accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Nathaniel J. Fullerton?
- (920) 324-6531, as listed in official Medicare / NPI Registry data.
- What is Nathaniel J. Fullerton's NPI number?
- 1366417461. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Nathaniel J. Fullerton works
Medicare's Facility Affiliation Data lists Nathaniel J. Fullerton at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Ripon Medical CenterRipon, WI · Critical Access Hospital · CCN 521321
- SSM Health St Agnes Hospital-Fond Du LacFond Du Lac, WI · Acute Care Hospital · CCN 520088
- Waupun Memorial HospitalWaupun, WI · Critical Access Hospital · CCN 521327
Practice locations
Addresses where Nathaniel J. Fullerton is enrolled with Medicare (CMS data updated 2026-10-02).
- 620 W Brown StWaupun, WI 53963 (920) 324‑6531
- 801 Braxton PlMadison, WI 53715 (414) 242‑5468
Group practices
Medicare enrollment lists Nathaniel J. Fullerton as a member of these groups (CMS data updated 2026-10-02).
- Agnesian Healthcare Inc388 clinicians in the group
- Informe Healthcare Il LLC23 clinicians in the group
Specialties
- Internal Medicineprimary
- Hospitalistalso
Other internal medicine doctors in Wisconsin
Clinicians with the same Medicare primary specialty in Wisconsin — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Wisconsin School Of Medicine |
| Graduation year | 1995 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1366417461 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians