Quick answers
- Which hospitals does Nathan D. Grunewald work at?
- Medicare's official clinician data lists Nathan D. Grunewald at 3 hospitals: Sauk Prairie Hospital, SSM Health St Clare Hospital - Baraboo and University of WI Hospitals & Clinics Authority. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Nathan D. Grunewald see patients?
- Medicare's clinician data lists 1 practice location in Prairie Du Sac, WI. Call before your visit to confirm the address.
- What is Nathan D. Grunewald's specialty?
- Medicare lists Urology as the primary specialty.
- Does Nathan D. Grunewald accept Medicare assignment?
- Yes. Medicare's clinician data says Nathan D. Grunewald 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.
- Does Nathan D. Grunewald offer telehealth?
- Medicare's clinician data says Nathan D. Grunewald offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Nathan D. Grunewald?
- (608) 643-2471, as listed in official Medicare / NPI Registry data.
- What is Nathan D. Grunewald's NPI number?
- 1396044509. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Nathan D. Grunewald works
Medicare's Facility Affiliation Data lists Nathan D. Grunewald at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Sauk Prairie HospitalPrairie Du Sac, WI · Acute Care Hospital · CCN 520095
- SSM Health St Clare Hospital - BarabooBaraboo, WI · Acute Care Hospital · CCN 520057
- University of WI Hospitals & Clinics AuthorityMadison, WI · Acute Care Hospital · CCN 520098
Practice locations
Addresses where Nathan D. Grunewald is enrolled with Medicare (CMS data updated 2026-10-02).
- 260 26th StPrairie Du Sac, WI 53578 (608) 643‑2471
Group practices
Medicare enrollment lists Nathan D. Grunewald as a member of this group (CMS data updated 2026-10-02).
- Sauk Prairie Healthcare Inc124 clinicians in the group
Specialties
- Urologyprimary
Other urologists in Wisconsin
Clinicians with the same Medicare primary specialty in Wisconsin — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Medical College Of Wisconsin |
| Graduation year | 2011 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1396044509 |
| 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