Quick answers
- Which hospitals does Matthew Stemm work at?
- Medicare's official clinician data lists Matthew Stemm at 5 hospitals: Ascension All Saints Hospital, Ascension Columbia St Marys Hospital Milwaukee, Ascension NE Wisconsin - St Elizabeth Campus, Ascension SE Wisconsin Hospital and Froedtert Memorial Lutheran Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Matthew Stemm see patients?
- Medicare's clinician data lists 2 practice locations, including Mequon, WI and Milwaukee, WI. Call before your visit to confirm the address.
- What is Matthew Stemm's specialty?
- Medicare lists Pathology as the primary specialty.
- Does Matthew Stemm accept Medicare assignment?
- Yes. Medicare's clinician data says Matthew Stemm 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 Matthew Stemm?
- (262) 243-7402, as listed in official Medicare / NPI Registry data.
- What is Matthew Stemm's NPI number?
- 1538470539. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Matthew Stemm works
Medicare's Facility Affiliation Data lists Matthew Stemm 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 NE Wisconsin - St Elizabeth CampusAppleton, WI · Acute Care Hospital · CCN 520009
- Ascension SE Wisconsin HospitalMilwaukee, WI · Acute Care Hospital · CCN 520136
- Froedtert Memorial Lutheran HospitalMilwaukee, WI · Acute Care Hospital · CCN 520177
Practice locations
Addresses where Matthew Stemm is enrolled with Medicare (CMS data updated 2026-10-02).
- 13111 N Port Washington RdMequon, WI 53097 (262) 243‑7402
- 2323 N Lake DrMilwaukee, WI 53211 (414) 961‑5362
Group practices
Medicare enrollment lists Matthew Stemm as a member of this group (CMS data updated 2026-10-02).
- North Shore Pathologists SC15 clinicians in the group
Specialties
- Pathologyprimary
Other pathologists in Mequon
Clinicians with the same Medicare primary specialty in Mequon, WI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Medical College Of Wisconsin |
| Graduation year | 2010 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1538470539 |
| 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