Quick answers
- Which hospitals does John C. Choi work at?
- Medicare's official clinician data lists John C. Choi at 2 hospitals: Northwestern Medicine Central Dupage Hospital and Northwestern Medicine Delnor Community Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John C. Choi see patients?
- Medicare's clinician data lists 1 practice location in Warrenville, IL. Call before your visit to confirm the address.
- What is John C. Choi's specialty?
- Medicare lists Ophthalmology as the primary specialty, and also Plastic and Reconstructive Surgery.
- Does John C. Choi accept Medicare assignment?
- Yes. Medicare's clinician data says John C. Choi 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 John C. Choi?
- (630) 836-1616, as listed in official Medicare / NPI Registry data.
- What is John C. Choi's NPI number?
- 1699765230. 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 C. Choi works
Medicare's Facility Affiliation Data lists John C. Choi at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Northwestern Medicine Central Dupage HospitalWinfield, IL · Acute Care Hospital · CCN 140242
- Northwestern Medicine Delnor Community HospitalGeneva, IL · Acute Care Hospital · CCN 140211
Practice locations
Addresses where John C. Choi is enrolled with Medicare (CMS data updated 2026-10-02).
- 28375 Davis Pkwy, Suite 905Warrenville, IL 60555 (630) 836‑1616
Specialties
Other ophthalmologists in Illinois
Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Harvard Medical School |
| Graduation year | 1990 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1699765230 |
| 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