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OSCAR CHEN MD, MS
NPI 1598329989
Ophthalmology in Orange, CA

Active since May 01, 2019PECOS EnrolledAccepts Medicare Assignment
101 THE CITY DR S, ORANGE, CA 92868(949) 824-7105 Get Directions Write a Review

NPPES record last updated: June 4, 2025. Verified against the NPPES registry weekly; last sync: September 06, 2026.

Record update history: Jun 4, 2025, Jun 15, 2021, May 1, 2019 (3 updates tracked since 2019).

About Oscar Chen Md, Ms NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

OSCAR CHEN MD, MS (NPI 1598329989) is an individual ophthalmology provider in Orange, California, licensed in California (201127) and active in the NPI registry since May 2019. He is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Rush Medical College Of Rush University (2021).

NPPES Registry Identity

NPI1598329989
Entity TypeIndividualMale
Primary Taxonomy207W00000X
Provider Legal NameOSCAR CHENCredential: MD, MS
Location Address101 THE CITY DR SOrange, CA 92868-3201
Mailing Address101 The City Dr SOrange, CA 92868-3201
Phone(949) 824-7105
Sole ProprietorYes
Medical School CMSRush Medical College Of Rush UniversityGraduated 2021
Enumeration DateMay 1, 2019
Last NPPES UpdateJune 4, 20253 updates tracked since enumeration
NPPES CertifiedJune 4, 2025
✔ NPI 1598329989 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOphthalmologyAllopathic & Osteopathic Physicians
Taxonomy Code207W00000X
Licenses✔ Licensed in CA · 201127✔ Licensed in IL · 125077452
Definition
An ophthalmologist has the knowledge and professional skills needed to provide comprehensive eye and vision care. Ophthalmologists are medically trained to diagnose, monitor and medically or surgically treat all ocular and visual disorders. This includes problems affecting the eye and its component structures, the eyelids, the orbit and the visual pathways. In so doing, an ophthalmologist prescribes vision services, including glasses and contact lenses.
101 THE CITY DR S, Orange, CA 92868
Open in Google Maps ↗

Secondary Practice Locations 2

Location 1600 S Paulina St Ste 403Chicago, IL 60612-3806 · Phone (312) 942-7100
Location 21725 W Harrison St Ste 906Chicago, IL 60612-3848 · Phone (312) 942-5000

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Oscar Chen Md, Ms is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID4880097674
PECOS Enrollment IDI20250606001655
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92868 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$77.96 typical visit price
range $20.84 – $153.61
Typical copayment $19.49 (range $5.21 – $38.40)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. ANKIT BHUPENDRA PATEL D.O.
Radiology (Diagnostic Radiology)
101 THE CITY DR S
ORANGE, CA 92868
Orange County (714) 456-5113
DR. LAURA CATHERINE SKOCZYLAS MD
Obstetrics & Gynecology
101 THE CITY DR S, BUILDING 56, DEPARTMENT OF OB/GYN
ORANGE, CA 92868
Orange County (714) 456-8224
MICHAEL CHENG DO
Internal Medicine (Rheumatology)
101 THE CITY DR S
ORANGE, CA 92868
Orange County (714) 456-7110
AESTHETIC AND PLASTIC SURGERY INSTITUTE
Plastic Surgery
101 THE CITY DR S
ORANGE, CA 92868
Orange County (714) 456-2986
JOSEPH VILLARREAL M.D.
Emergency Medicine
101 THE CITY DR S, BUILDING 1A, ROOM 1009
ORANGE, CA 92868
Orange County (714) 456-5239
DEMI TRAN
Psychiatry & Neurology (Neurology)
101 THE CITY DR S, CITY TOWER, SUITE 400
ORANGE, CA 92868
Orange County (171) 456-6693
DR. ISABEL CARLTON CLARK M.D.
Surgery (Trauma Surgery)
101 THE CITY DR S
ORANGE, CA 92868
Orange County (714) 456-7890
DYLAN LUKATO
Emergency Medicine
101 THE CITY DR S
ORANGE, CA 92868
Orange County (415) 218-8041

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Oscar Chen's NPI number?

The NPI number for Oscar Chen is 1598329989. It was assigned to this individual provider in the NPPES registry on May 1, 2019.

Where is Oscar Chen located?

Oscar Chen practices at 101 The City Dr S, Orange, CA 92868. The listed phone number is (949) 824-7105.

What is Oscar Chen's specialty?

The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.

Is Oscar Chen enrolled in Medicare?

Yes. Oscar Chen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

When was this NPI record last updated?

The NPPES record for Oscar Chen was last updated on June 4, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.