Quick answers
- Where does Jeffrey J. Williams see patients?
- Medicare's clinician data lists 3 practice locations, including Joliet, IL, Olympia Fields, IL and Bolingbrook, IL. Call before your visit to confirm the address.
- What is Jeffrey J. Williams's specialty?
- Medicare lists Obstetrics/Gynecology as the primary specialty.
- Does Jeffrey J. Williams accept Medicare assignment?
- Yes. Medicare's clinician data says Jeffrey J. 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 Jeffrey J. Williams?
- (815) 727-8670, as listed in official Medicare / NPI Registry data.
- What is Jeffrey J. Williams's NPI number?
- 1134328644. 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 Jeffrey J. Williams is enrolled with Medicare (CMS data updated 2026-10-02).
- 1106 Neal AveJoliet, IL 60433 (815) 727‑8670
- 20201 S Crawford Ave, Suite 1400Olympia Fields, IL 60461 (708) 379‑2310
- 391 Quadrangle Dr, Suite 130Bolingbrook, IL 60440 (630) 679‑7000
Group practices
Medicare enrollment lists Jeffrey J. Williams as a member of these groups (CMS data updated 2026-10-02).
- Specialty Physicians of Illinois LLC102 clinicians in the group
- Will County Community Health Center20 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Joliet
Clinicians with the same Medicare primary specialty in Joliet, IL — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Mid West Medical College |
| Graduation year | 2003 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1134328644 |
| 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