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

James J Koster, MD

Individual provider Ophthalmology Physician · NPI 1851387344

James J Koster, MD is an Ophthalmology in Phoenix, Arizona. Graduated from University of Arizona College of Medicine in 1999, 27 years ago. Practices with Associated Ophthalmologists Ltd, an 18-clinician group and accepts Medicare assignment. Licensed in Arizona.

Years since qualifying
27
Trained at
University of Arizona College of Medicine
Licensed in
AZ
In the registry since
2005
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

300 E Osborn Rd Ste 100
Phoenix, AZ 85012-2347
Phone: (480) 994-5012
Fax: (480) 994-9479
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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 32672 (AZ)

Record details

NPI number1851387344
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 21, 2005
Last updated in NPPESDecember 6, 2024
Certification dateDecember 6, 2024

Medicare enrollment

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

Medicare specialtyOPHTHALMOLOGY
Medical schoolUNIVERSITY OF ARIZONA COLLEGE OF MEDICINE
Graduated 1999 (27 years in practice)
Group practice Associated Ophthalmologists Ltd — 18 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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