Quick answers
- Which hospitals does Oscar Q. Chen work at?
- Medicare's official clinician data lists Oscar Q. Chen at 1 hospital: UCI Health-Orange. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Oscar Q. Chen see patients?
- Medicare's clinician data lists 2 practice locations, including Orange, CA and Lexington, MA. Call before your visit to confirm the address.
- What is Oscar Q. Chen's specialty?
- Medicare lists Ophthalmology as the primary specialty.
- Does Oscar Q. Chen accept Medicare assignment?
- Medicare's clinician data says Oscar Q. Chen may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is the phone number for Oscar Q. Chen?
- (714) 456-8068, as listed in official Medicare / NPI Registry data.
- What is Oscar Q. Chen's NPI number?
- 1598329989. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Oscar Q. Chen works
Medicare's Facility Affiliation Data lists Oscar Q. Chen at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- UCI Health-OrangeOrange, CA · Acute Care Hospital · CCN 050348
Practice locations
Addresses where Oscar Q. Chen is enrolled with Medicare (CMS data updated 2026-10-02).
- 101 the City Dr SOrange, CA 92868 (714) 456‑8068
- 21 Worthen RdLexington, MA 02421 (781) 862‑1620
Group practices
Medicare enrollment lists Oscar Q. Chen as a member of these groups (CMS data updated 2026-10-02).
- Regents of the University of California54 clinicians in the group
- Lexington Eye Associates - Bid34 clinicians in the group
- Lexington Eye Associates, Inc34 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Orange
Clinicians with the same Medicare primary specialty in Orange, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Rush Medical College Of Rush University |
| Graduation year | 2021 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1598329989 |
| 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