Quick answers
- Where does William Sideras see patients?
- Medicare's clinician data lists 9 practice locations, including Tinley Park, IL, Chicago, IL and Cicero, IL. Call before your visit to confirm the address.
- What is William Sideras's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does William Sideras accept Medicare assignment?
- Yes. Medicare's clinician data says William Sideras 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 William Sideras?
- (708) 942-6707, as listed in official Medicare / NPI Registry data.
- What is William Sideras's NPI number?
- 1700429040. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where William Sideras is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 9; the Medicare profile lists all.
- 17119 La Grange RdTinley Park, IL 60487 (708) 942‑6707
- 17126 Harlem AveTinley Park, IL 60477 (331) 481‑5048
- 3258 W 111th StChicago, IL 60655 (773) 629‑8217
- 3314 S Cicero AveCicero, IL 60804 (708) 656‑3831
- 40 75th StWillowbrook, IL 60527 (630) 581‑5372
Group practices
Medicare enrollment lists William Sideras as a member of this group (CMS data updated 2026-10-02).
- Midwest Express Care 2, Inc222 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Tinley Park
Clinicians with the same Medicare primary specialty in Tinley Park, IL — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Medical school | Southern Illinois University School Of Medicine |
| Graduation year | 2019 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1700429040 |
| 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
- 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