Quick answers
- Which hospitals does Sean Williams work at?
- Medicare's official clinician data lists Sean Williams at 3 hospitals: Saint Alphonsus Medical Center Ontario, Saint Alphonsus Regional Medical Center and St Luke's Regional Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Sean Williams see patients?
- Medicare's clinician data lists 2 practice locations, including Nampa, ID and Ontario, OR. Call before your visit to confirm the address.
- What is Sean Williams's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does Sean Williams accept Medicare assignment?
- Yes. Medicare's clinician data says Sean 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 Sean Williams?
- (208) 498-1333, as listed in official Medicare / NPI Registry data.
- What is Sean Williams's NPI number?
- 1417488354. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Sean Williams works
Medicare's Facility Affiliation Data lists Sean Williams at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Saint Alphonsus Medical Center OntarioOntario, OR · Acute Care Hospital · CCN 380052
- Saint Alphonsus Regional Medical CenterBoise, ID · Acute Care Hospital · CCN 130007
- St Luke's Regional Medical CenterBoise, ID · Acute Care Hospital · CCN 130006
Practice locations
Addresses where Sean Williams is enrolled with Medicare (CMS data updated 2026-10-02).
- 1510 12th Ave Rd, Suite 100Nampa, ID 83686 (208) 498‑1333
- 351 SW 9th StOntario, OR 97914 (541) 881‑7000
Group practices
Medicare enrollment lists Sean Williams as a member of this group (CMS data updated 2026-10-02).
- Cep America LLC1,023 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Idaho
Clinicians with the same Medicare primary specialty in Idaho — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Graduation year | 2017 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1417488354 |
| 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