Quick answers
- Which hospitals does Maggie Gierahn work at?
- Medicare's official clinician data lists Maggie Gierahn at 4 hospitals: Ascension All Saints Hospital, Ascension Columbia St Marys Hospital Milwaukee, Ascension SE Wisconsin Hospital and Ascension St Francis Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Maggie Gierahn see patients?
- Medicare's clinician data lists 4 practice locations, including Milwaukee, WI and West Allis, WI. Call before your visit to confirm the address.
- What is Maggie Gierahn's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Maggie Gierahn accept Medicare assignment?
- Yes. Medicare's clinician data says Maggie Gierahn 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 Maggie Gierahn?
- (414) 585-1000, as listed in official Medicare / NPI Registry data.
- What is Maggie Gierahn's NPI number?
- 1447746896. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Maggie Gierahn works
Medicare's Facility Affiliation Data lists Maggie Gierahn at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Ascension All Saints HospitalRacine, WI · Acute Care Hospital · CCN 520096
- Ascension Columbia St Marys Hospital MilwaukeeMilwaukee, WI · Acute Care Hospital · CCN 520051
- Ascension SE Wisconsin HospitalMilwaukee, WI · Acute Care Hospital · CCN 520136
- Ascension St Francis HospitalMilwaukee, WI · Acute Care Hospital · CCN 520078
Practice locations
Addresses where Maggie Gierahn is enrolled with Medicare (CMS data updated 2026-10-02).
- 2301 N Lake DrMilwaukee, WI 53211
- 2323 N Lake DrMilwaukee, WI 53211 (414) 585‑1000
- 2350 N Lake DrMilwaukee, WI 53211
- 801 S 70th StWest Allis, WI 53214 (414) 773‑6600
Group practices
Medicare enrollment lists Maggie Gierahn as a member of this group (CMS data updated 2026-10-02).
- Columbia St Marys Hospital Milwaukee Inc306 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Milwaukee
Clinicians with the same Medicare primary specialty in Milwaukee, WI — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2018 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1447746896 |
| 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