Quick answers
- Which hospitals does Stephen Williams work at?
- Medicare's official clinician data lists Stephen Williams at 3 hospitals: Oconomowoc Memorial Hospital, Watertown Memorial Hospital and Waukesha Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Stephen Williams see patients?
- Medicare's clinician data lists 4 practice locations, including Waukesha, WI and Oconomowoc, WI. Call before your visit to confirm the address.
- What is Stephen Williams's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does Stephen Williams accept Medicare assignment?
- Yes. Medicare's clinician data says Stephen Williams 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 Stephen Williams?
- (262) 542-9212, as listed in official Medicare / NPI Registry data.
- What is Stephen Williams's NPI number?
- 1801356845. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Stephen Williams works
Medicare's Facility Affiliation Data lists Stephen Williams at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Oconomowoc Memorial HospitalOconomowoc, WI · Acute Care Hospital · CCN 520062
- Watertown Memorial HospitalWatertown, WI · Acute Care Hospital · CCN 520116
- Waukesha Memorial HospitalWaukesha, WI · Acute Care Hospital · CCN 520008
Practice locations
Addresses where Stephen Williams is enrolled with Medicare (CMS data updated 2026-10-02).
- 1111 Delafield St, Suite 112Waukesha, WI 53188 (262) 542‑9212
- 725 American AveWaukesha, WI 53188 (262) 928‑2400
- 791 Summit AveOconomowoc, WI 53066 (262) 569‑0263
- N16W24131 Riverwood DrWaukesha, WI 53188 (262) 696‑0808
Group practices
Medicare enrollment lists Stephen Williams as a member of these groups (CMS data updated 2026-10-02).
- Prohealth Medical Group Inc479 clinicians in the group
- Radiology Waukesha SC29 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Waukesha
Clinicians with the same Medicare primary specialty in Waukesha, WI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2019 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1801356845 |
| 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