Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

John Kok-Sen Chan, MD

Individual provider Ophthalmology Physician · NPI 1609928837

John Kok-Sen Chan, MD is an Ophthalmology in Union City, California. Graduated from New York Medical College in 1997, 29 years ago. Practices with Permanente Medical Group Inc, a 10,941-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
29
Trained at
New York Medical College
Licensed in
CA
In the registry since
2007
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

3553 Whipple Rd
Union City, CA 94587-1507
Phone: (510) 454-1000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Ophthalmology Physician (primary) Taxonomy 207W00000X · Licence A70464 (CA)

Record details

NPI number1609928837
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 17, 2007
Last updated in NPPESDecember 6, 2021
Mailing address3553 Whipple Rd, Union City, CA 94587-1507

Medicare enrollment

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

Medicare specialtyOPHTHALMOLOGY
Medical schoolNEW YORK MEDICAL COLLEGE
Graduated 1997 (29 years in practice)
Group practice Permanente Medical Group Inc — 10941 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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