Quick answers
- Which hospitals does Mark K. Chelmowski work at?
- Medicare's official clinician data lists Mark K. Chelmowski at 1 hospital: Aurora Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark K. Chelmowski 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 Mark K. Chelmowski's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Mark K. Chelmowski accept Medicare assignment?
- Yes. Medicare's clinician data says Mark K. Chelmowski 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 Mark K. Chelmowski?
- (414) 352-3100, as listed in official Medicare / NPI Registry data.
- What is Mark K. Chelmowski's NPI number?
- 1659306041. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark K. Chelmowski works
Medicare's Facility Affiliation Data lists Mark K. Chelmowski at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Aurora Medical CenterGrafton, WI · Acute Care Hospital · CCN 520207
Practice locations
Addresses where Mark K. Chelmowski is enrolled with Medicare (CMS data updated 2026-10-02).
- 12203 N Corporate PkwyMequon, WI 53092
- 3003 W Good Hope RdMilwaukee, WI 53209 (414) 352‑3100
Group practices
Medicare enrollment lists Mark K. Chelmowski as a member of this group (CMS data updated 2026-10-02).
- Aurora Advanced Healthcare, Inc.1,124 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Mequon
Clinicians with the same Medicare primary specialty in Mequon, WI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Iowa, Rj & L Carver College Of Medicine |
| Graduation year | 1985 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1659306041 |
| 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