Quick answers
- Which hospitals does Donald D. Nimmer work at?
- Medicare's official clinician data lists Donald D. Nimmer at 3 hospitals: Ascension SE Wisconsin Hospital, Ascension St Francis Hospital and West Allis Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Donald D. Nimmer see patients?
- Medicare's clinician data lists 1 practice location in Greenfield, WI. Call before your visit to confirm the address.
- What is Donald D. Nimmer's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does Donald D. Nimmer accept Medicare assignment?
- Yes. Medicare's clinician data says Donald D. Nimmer 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 Donald D. Nimmer?
- (414) 777-3100, as listed in official Medicare / NPI Registry data.
- What is Donald D. Nimmer's NPI number?
- 1477555951. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Donald D. Nimmer works
Medicare's Facility Affiliation Data lists Donald D. Nimmer at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Ascension SE Wisconsin HospitalMilwaukee, WI · Acute Care Hospital · CCN 520136
- Ascension St Francis HospitalMilwaukee, WI · Acute Care Hospital · CCN 520078
- West Allis Memorial HospitalWest Allis, WI · Acute Care Hospital · CCN 520139
Practice locations
Addresses where Donald D. Nimmer is enrolled with Medicare (CMS data updated 2026-10-02).
- 4935 S 76th St, Suite 101Greenfield, WI 53220 (414) 777‑3100
Group practices
Medicare enrollment lists Donald D. Nimmer as a member of this group (CMS data updated 2026-10-02).
- Ascension Medical Group-Southeast Wisconsin Inc545 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Greenfield
Clinicians with the same Medicare primary specialty in Greenfield, WI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Medical College Of Wisconsin |
| Graduation year | 1987 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1477555951 |
| 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