Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Jefferson William Chen, MDPHD

Individual provider Neurological Surgery Physician · NPI 1992789747

Dr. Jefferson William Chen, MDPHD practises Neurosurgery in Orange, California. Graduated from Johns Hopkins University School of Medicine in 1987, 39 years ago. Practices with Regents of the University of California, a 26-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in Arizona, California, Oregon and Texas.

Years since qualifying
39
Trained at
Johns Hopkins University School of Medicine
Licensed in
AZ, CA, OR, TX
In the registry since
2005
Specialties on file
4
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Practice location Address checks out

101 The City Dr S
Orange, CA 92868-3201
Phone: (714) 880-7812
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Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 501 N Graham St, Portland, OR 97227-1654 — (503) 788-6721

Specialties & licences

Neurological Surgery Physician (primary) Taxonomy 207T00000X · Licence A45489 (CA)
Neurological Surgery Physician Taxonomy 207T00000X · Licence MD21924 (OR)
Neurological Surgery Physician Taxonomy 207T00000X · Licence J6902 (TX)
Neurological Surgery Physician Taxonomy 207T00000X · Licence 21671 (AZ)

Record details

NPI number1992789747
Entity typeIndividual (Type 1)
GenderMale
Credentials MDPHD
Sole proprietorNo
NPI enumeratedDecember 5, 2005
Last updated in NPPESNovember 3, 2022
Certification dateNovember 3, 2022

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNEUROSURGERY
Medical schoolJOHNS HOPKINS UNIVERSITY SCHOOL OF MEDICINE
Graduated 1987 (39 years in practice)
Group practice Regents Of The University Of California — 26 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients198
Services billed 656 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $53 2 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Regents of the University of California

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 26 clinicians in the practice; 12 are shown here.

Other providers in Orange