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

Chuan-Jay J Chen, MD

Individual provider Emergency Medicine Physician · NPI 1205366457

Chuan-Jay J Chen, MD practises Emergency Medicine in Saint Helena, California. Graduated from University of California, San Francisco School of Medicine in 2017, 9 years ago. Practices with Mills-Peninsula Emergency Medical Associates, Inc, a 29-clinician group and accepts Medicare assignment. Licensed in California and Massachusetts.

Years since qualifying
9
Trained at
University of California, San Francisco School of Medicine
Licensed in
CA, MA
In the registry since
2017
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

10 Woodland Rd
Saint Helena, CA 94574-9554
Phone: (707) 963-6425
Show map & directions

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

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 272210 (MA)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 171993 (CA)

Record details

NPI number1205366457
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 19, 2017
Last updated in NPPESOctober 4, 2022
Certification dateOctober 4, 2022

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolUNIVERSITY OF CALIFORNIA, SAN FRANCISCO SCHOOL OF MEDICINE
Graduated 2017 (9 years in practice)
Group practice Mills-Peninsula Emergency Medical Associates, Inc — 29 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients500
Services billed 1,006 a service is one billed item, such as a visit, a test or a procedure
Average patient age78

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.

Colleagues at Mills-Peninsula Emergency Medical Associates, Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 29 clinicians in the practice; 12 are shown here.

Other providers in Saint Helena