Quick answers
- Which hospitals does Steve R. Johnston work at?
- Medicare's official clinician data lists Steve R. Johnston at 3 hospitals: 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 Steve R. Johnston see patients?
- Medicare's clinician data lists 3 practice locations, including Milwaukee, WI and Mount Pleasant, WI. Call before your visit to confirm the address.
- What is Steve R. Johnston's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Steve R. Johnston accept Medicare assignment?
- Yes. Medicare's clinician data says Steve R. Johnston 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 Steve R. Johnston?
- (414) 585-1000, as listed in official Medicare / NPI Registry data.
- What is Steve R. Johnston's NPI number?
- 1275623993. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Steve R. Johnston works
Medicare's Facility Affiliation Data lists Steve R. Johnston at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- 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 Steve R. Johnston is enrolled with Medicare (CMS data updated 2026-10-02).
- 2301 N Lake DrMilwaukee, WI 53211 (414) 585‑1000
- 3801 Spring StMount Pleasant, WI 53405 (262) 687‑4011
- 5000 W Chambers StMilwaukee, WI 53210 (414) 447‑2569
Group practices
Medicare enrollment lists Steve R. Johnston as a member of these groups (CMS data updated 2026-10-02).
- Ascension Medical Group-Southeast Wisconsin Inc545 clinicians in the group
- Columbia St Marys Hospital Milwaukee Inc306 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Milwaukee
Clinicians with the same Medicare primary specialty in Milwaukee, WI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Wisconsin School Of Medicine |
| Graduation year | 1994 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1275623993 |
| 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