Quick answers
- Which hospitals does James Sostak work at?
- Medicare's official clinician data lists James Sostak at 4 hospitals: Advocate Sherman Hospital, Northwestern Medicine Central Dupage Hospital, Northwestern Medicine Delnor Community Hospital and Northwestern Medicine McHenry. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does James Sostak see patients?
- Medicare's clinician data lists 3 practice locations, including Elgin, IL and Geneva, IL. Call before your visit to confirm the address.
- What is James Sostak's specialty?
- Medicare lists Sports Medicine as the primary specialty, and also Orthopedic Surgery.
- Does James Sostak accept Medicare assignment?
- Yes. Medicare's clinician data says James Sostak 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 James Sostak?
- (847) 468-1400, as listed in official Medicare / NPI Registry data.
- What is James Sostak's NPI number?
- 1235200833. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where James Sostak works
Medicare's Facility Affiliation Data lists James Sostak at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Advocate Sherman HospitalElgin, IL · Acute Care Hospital · CCN 140030
- Northwestern Medicine Central Dupage HospitalWinfield, IL · Acute Care Hospital · CCN 140242
- Northwestern Medicine Delnor Community HospitalGeneva, IL · Acute Care Hospital · CCN 140211
- Northwestern Medicine McHenryMcHenry, IL · Acute Care Hospital · CCN 140116
Practice locations
Addresses where James Sostak is enrolled with Medicare (CMS data updated 2026-10-02).
- 1975 Lin Lor LnElgin, IL 60123 (847) 468‑1400
- 2350 Royal Blvd, Suite 200Elgin, IL 60123 (847) 931‑5300
- 2525 Kaneville RdGeneva, IL 60134 (847) 468‑1400
Group practices
Medicare enrollment lists James Sostak as a member of this group (CMS data updated 2026-10-02).
- Fox Valley Orthopaedic Associates, PLLC73 clinicians in the group
Specialties
- Sports Medicineprimary
- Orthopedic Surgeryalso
Other sports medicine doctors in Illinois
Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Loyola University Of Chicago, Stritch School Of Medicine |
| Graduation year | 2005 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1235200833 |
| 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