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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).

Patient Reviews

Patient comments (3)

The overall average patient rating of Dr. James Koster is Excellent. Dr. Koster has been reviewed by 13 patients who have provided 3 comments. The rating is 5 out of 5 stars.

Patient Ratings
Ease of Appointment 4.5
Promptness 4.2
Courteous Staff 4.8
Accurate Diagnosis 5.0
Bedside Manner 5.0
Spends Time with Me 5.0
Follows Up After Visit 5.0

Specialties & Research

Dr. James Koster, MD is board certified in Ophthalmology.

  • He has special expertise in 1 area:
  • Corneal Diseases

Education & Awards

Dr. Koster graduated from University of Arizona, Tucson. He has 2 awards.

Patients' Choice Award (2009 - 2012)
Compassionate Doctor Recognition (2009 - 2012)


Dr. Koster has 3 hospital affiliations:

  • CHANDLER REGIONAL Medical Center 
  • St Joseph's Hospital 
  • St Josephs Hospital and Medical Center 


  • Spanish

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Additional Information
Dr. James John Koster MD is a male Ophthalmologist, has 10 years of experience and practices in Ophthalmology.
Where does Dr. James J. Koster practice?
Dr. James Koster has 3 office locations.
Dr. James Koster practices Ophthalmology near Phoenix, AZ.
Additional practice locations include: Paradise Valley, AZ.
See Phoenix Ophthalmologists.