Quick answers
- Which hospitals does Mark S. Williams work at?
- Medicare's official clinician data lists Mark S. Williams at 4 hospitals: Saint Alphonsus Medical Center - Nampa, St Luke's Nampa Medical Center, St Luke's Regional Medical Center and Treasure Valley Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark S. Williams see patients?
- Medicare's clinician data lists 1 practice location in Nampa, ID. Call before your visit to confirm the address.
- What is Mark S. Williams's specialty?
- Medicare lists Sports Medicine as the primary specialty.
- Does Mark S. Williams accept Medicare assignment?
- Yes. Medicare's clinician data says Mark S. 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 Mark S. Williams?
- (208) 321-4000, as listed in official Medicare / NPI Registry data.
- What is Mark S. Williams's NPI number?
- 1114961166. 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 S. Williams works
Medicare's Facility Affiliation Data lists Mark S. 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 - NampaNampa, ID · Acute Care Hospital · CCN 130013
- St Luke's Nampa Medical CenterNampa, ID · Acute Care Hospital · CCN 130071
- St Luke's Regional Medical CenterBoise, ID · Acute Care Hospital · CCN 130006
- Treasure Valley HospitalBoise, ID · Acute Care Hospital · CCN 130063
Practice locations
Addresses where Mark S. Williams is enrolled with Medicare (CMS data updated 2026-10-02).
- 16818 N Marketplace BlvdNampa, ID 83687 (208) 321‑4000
Group practices
Medicare enrollment lists Mark S. Williams as a member of this group (CMS data updated 2026-10-02).
- Direct Orthopedic Care LLC33 clinicians in the group
Specialties
- Sports Medicineprimary
Other sports medicine doctors in Idaho
Clinicians with the same Medicare primary specialty in Idaho — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | At Still University Of Health Sciences, College Of Osteo Med, Kirksville |
| Graduation year | 1993 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1114961166 |
| 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