Quick answers
- Which hospitals does Peter A. Williams work at?
- Medicare's official clinician data lists Peter A. Williams at 5 hospitals: OSF Holy Family Medical Center, OSF Saint Elizabeth MDL Ctr, OSF St Francis Hospital and Medical Group, Saint Francis Medical Center and St Mary Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Peter A. Williams see patients?
- Medicare's clinician data lists 28 practice locations, including Washington, IL, Monmouth, IL and Kewanee, IL. Call before your visit to confirm the address.
- What is Peter A. Williams's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does Peter A. Williams accept Medicare assignment?
- Yes. Medicare's clinician data says Peter A. 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 Peter A. Williams?
- (309) 566-4062, as listed in official Medicare / NPI Registry data.
- What is Peter A. Williams's NPI number?
- 1891864625. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Peter A. Williams works
Medicare's Facility Affiliation Data lists Peter A. Williams at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- OSF Holy Family Medical CenterMonmouth, IL · Critical Access Hospital · CCN 141318
- OSF Saint Elizabeth MDL CtrPeru, IL · Acute Care Hospital · CCN 140110
- OSF St Francis Hospital and Medical GroupEscanaba, MI · Critical Access Hospital · CCN 231337
- Saint Francis Medical CenterPeoria, IL · Acute Care Hospital · CCN 140067
- St Mary Medical CenterGalesburg, IL · Acute Care Hospital · CCN 140064
Practice locations
Addresses where Peter A. Williams is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 28; the Medicare profile lists all.
- 10 Saint Clare CtWashington, IL 61571 (309) 566‑4062
- 1000 W Harlem AveMonmouth, IL 61462
- 1051 W S StKewanee, IL 61443 (309) 852‑7500
- 1100 E Norris DrOttawa, IL 61350 (815) 433‑3100
- 111 Spring StStreator, IL 61364 (815) 673‑2311
Group practices
Medicare enrollment lists Peter A. Williams as a member of these groups (CMS data updated 2026-10-02).
- OSF Multi-Specialty Group2,114 clinicians in the group
- Central Illinois Radiological Associates Ltd209 clinicians in the group
- Cira Michigan PC91 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Washington
Clinicians with the same Medicare primary specialty in Washington, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Rush Medical College Of Rush University |
| Graduation year | 1991 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1891864625 |
| 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