Quick answers
- Which hospitals does Jonathan F. Williams work at?
- Medicare's official clinician data lists Jonathan F. Williams at 3 hospitals: Mercy Health System Corp, Northshore University Healthsystem - Evanston Hospital and Swedish Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Jonathan F. Williams see patients?
- Medicare's clinician data lists 2 practice locations, including Janesville, WI and Glenview, IL. Call before your visit to confirm the address.
- What is Jonathan F. Williams's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Jonathan F. Williams accept Medicare assignment?
- Medicare's clinician data says Jonathan F. Williams may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- Does Jonathan F. Williams offer telehealth?
- Medicare's clinician data says Jonathan F. Williams offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Jonathan F. Williams?
- (608) 756-6000, as listed in official Medicare / NPI Registry data.
- What is Jonathan F. Williams's NPI number?
- 1013195650. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Jonathan F. Williams works
Medicare's Facility Affiliation Data lists Jonathan F. Williams at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mercy Health System CorpJanesville, WI · Acute Care Hospital · CCN 520066
- Northshore University Healthsystem - Evanston HospitalEvanston, IL · Acute Care Hospital · CCN 140010
- Swedish HospitalChicago, IL · Acute Care Hospital · CCN 140114
Practice locations
Addresses where Jonathan F. Williams is enrolled with Medicare (CMS data updated 2026-10-02).
- 1000 Mineral Point AveJanesville, WI 53548 (608) 756‑6000
- 2050 Pfingsten RdGlenview, IL 60026 (847) 998‑0510
Group practices
Medicare enrollment lists Jonathan F. Williams as a member of these groups (CMS data updated 2026-10-02).
- Mercy Health System Corporation753 clinicians in the group
- Gastroenterology Consultants of the North Shore2 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Janesville
Clinicians with the same Medicare primary specialty in Janesville, WI — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Graduation year | 2002 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1013195650 |
| 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