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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Learn more about Dr. John Chan:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (0)

The overall average patient rating of Dr. John Chan is Excellent. Dr. Chan has been reviewed by 3 patients who have provided 0 comments. The rating is 5 out of 5 stars.

Patient Ratings
Ease of Appointment 5.0
Promptness 3.7
Courteous Staff 5.0
Accurate Diagnosis 5.0
Bedside Manner 5.0
Spends Time with Me 5.0
Follows Up After Visit 5.0

Specialties & Research

Dr. John Chan, MD is board certified in Ophthalmology.

  • He has special expertise in 1 area:
  • Gyn Cancer

Education & Awards

Dr. Chan graduated from New York Medical College, Valhalla.


Dr. Chan has 6 hospital affiliations:

  • Mills-Peninsula Health Services 
  • Kaiser Foundation Hospital - Fremont 


  • Spanish
  • Tagalog
  • Mandarin

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Additional Information
Dr. John Kok-Sen Chan MD is a male Ophthalmologist, has 15 years of experience and practices in Ophthalmology.
Where does Dr. John K. Chan practice?
Dr. John Chan has 2 office locations.
Dr. John Chan practices Ophthalmology near Union City, CA.
Additional practice locations include: San Francisco, CA.
See Union City Ophthalmologists.