Quick answers
- Which hospitals does John J. Oh work at?
- Medicare's official clinician data lists John J. Oh at 2 hospitals: Advocate Lutheran General Hospital and Northshore University Healthsystem - Evanston Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John J. Oh see patients?
- Medicare's clinician data lists 1 practice location in Buffalo Grove, IL. Call before your visit to confirm the address.
- What is John J. Oh's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does John J. Oh accept Medicare assignment?
- Yes. Medicare's clinician data says John J. Oh 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.
- Does John J. Oh offer telehealth?
- Medicare's clinician data says John J. Oh offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for John J. Oh?
- (847) 375-8282, as listed in official Medicare / NPI Registry data.
- What is John J. Oh's NPI number?
- 1992730725. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John J. Oh works
Medicare's Facility Affiliation Data lists John J. Oh at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Advocate Lutheran General HospitalPark Ridge, IL · Acute Care Hospital · CCN 140223
- Northshore University Healthsystem - Evanston HospitalEvanston, IL · Acute Care Hospital · CCN 140010
Practice locations
Addresses where John J. Oh is enrolled with Medicare (CMS data updated 2026-10-02).
- 150 W Half Day Rd, Suite 206Buffalo Grove, IL 60089 (847) 375‑8282
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Buffalo Grove
Clinicians with the same Medicare primary specialty in Buffalo Grove, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Northwestern University Feinberg Medical School |
| Graduation year | 1995 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1992730725 |
| 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