Browse Health
Ophthalmologist (eyes)
26 years of experience
Accepting new patients
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).

Patient Reviews

Patient comments (0)

The overall average patient rating of Dr. Mark Koser is Excellent. Dr. Koser has been reviewed by 2 patients who have provided 0 comments. The rating is 5 out of 5 stars.

Specialties & Research

Dr. Mark Koser, MD is board certified in Ophthalmology.

Education & Awards

Dr. Koser graduated from State University of New York Downstate, Brooklyn.


Dr. Koser has 16 hospital affiliations:

  • Staten Island University Hospital North 
  • University Hospital of Brooklyn at Long Island Hospital 


  • Italian
  • Spanish

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Additional Information
Dr. Mark William Koser MD is a male Ophthalmologist, has 26 years of experience and practices in Ophthalmology.
Where does Dr. Mark W. Koser practice?
Dr. Mark Koser has 3 office locations.
Dr. Mark Koser practices Ophthalmology near Staten Island, NY.
Additional practice locations include: Brooklyn, NY.
See Staten Island Ophthalmologists.