Quick answers
- Which hospitals does Gerald J. Osher work at?
- Medicare's official clinician data lists Gerald J. Osher at 3 hospitals: Northshore University Healthsystem - Evanston Hospital, Northwestern Lake Forest Hospital and Northwestern Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gerald J. Osher see patients?
- Medicare's clinician data lists 1 practice location in Bannockburn, IL. Call before your visit to confirm the address.
- What is Gerald J. Osher's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Gerald J. Osher accept Medicare assignment?
- Yes. Medicare's clinician data says Gerald J. Osher 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 Gerald J. Osher?
- (847) 317-1717, as listed in official Medicare / NPI Registry data.
- What is Gerald J. Osher's NPI number?
- 1326056136. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gerald J. Osher works
Medicare's Facility Affiliation Data lists Gerald J. Osher at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Northshore University Healthsystem - Evanston HospitalEvanston, IL · Acute Care Hospital · CCN 140010
- Northwestern Lake Forest HospitalLake Forest, IL · Acute Care Hospital · CCN 140130
- Northwestern Memorial HospitalChicago, IL · Acute Care Hospital · CCN 140281
Practice locations
Addresses where Gerald J. Osher is enrolled with Medicare (CMS data updated 2026-10-02).
- 2101 Waukegan Rd, Suite 200Bannockburn, IL 60015 (847) 317‑1717
Group practices
Medicare enrollment lists Gerald J. Osher as a member of this group (CMS data updated 2026-10-02).
- Brent M Nathan MD PLLC5 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Bannockburn
Clinicians with the same Medicare primary specialty in Bannockburn, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Michigan Medical School |
| Graduation year | 1980 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1326056136 |
| 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