James J. Koster, MD
Ophthalmology Physician · Phoenix, AZ
James J. Koster, MD is an ophthalmology physician with a practice address in Phoenix, Arizona, and NPI 1851387344, issued on Sep 21, 2005. Check the license (Arizona 32672, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- James J. Koster
- Credential
- MD
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- 32672 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 300 E Osborn RD Ste 100, Phoenix, AZ 85012
- Phone
- (480) 994-5012
- Enumerated
- Sep 21, 2005
- Record last updated
- Dec 6, 2024
- Fax
- (480) 994-9479
- Medicaid ID
- 870643 AZ
- Medicare enrollment
- Enrolled (PECOS I20040726000718); accepts Medicare assignment
- Medical or professional school
- University Of Arizona College Of Medicine, 1999
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 353 in Arizona → Look up another NPI →
Also registered at 300 E Osborn RD Ste 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Nathan Kanyinda, MDOphthalmology Physician1578918066
Verify James J. Koster in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 32672Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
23% fewer Medicare Part D claims than the average ophthalmology physician in 2024
1,172 Medicare Part D claims for 360 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 49% of claims.
Most prescribed
- Latanoprost317 claims
- Prednisolone Acetate188 claims
- Timolol Maleate93 claims
- Lumigan81 claims
- Ketorolac Tromethamine62 claims
- Moxifloxacin62 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 95.4 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $462.12
15 payments; by number, the most common kind was food and beverage; the largest payer was Lumenis BE inc. The 13,221 providers of this specialty with any payment received $4,535.02 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Associated Ophthalmologists LtdPhoenix, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
James J. Koster among 353 ophthalmology physician records in Arizona
James J. Koster, MD is one of 353 ophthalmology physician records with a practice address in Arizona. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 82% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1999 · median 2000 among the 220 with a school on file
- Record last updated2024 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in Arizona
There are 353 ophthalmology physician records in Arizona.
All 353 in Arizona → Every provider in Phoenix → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- E. Bloemker, M.D.Phoenix, AZ 850121225011505
- Robert Brems, MDPhoenix, AZ 850121205926623
- Leslie Kanda, MDPhoenix, AZ 850121265426951
- Nathan Kanyinda, MDPhoenix, AZ 850121578918066
- J Stadwiser, M.D.Phoenix, AZ 850131265415558
- George Yanik, M.D.Phoenix, AZ 850131205819489
- Raymond Zimmerman, M.D.Phoenix, AZ 850131639152911
- Pravin DugelPhoenix, AZ 850141780686766
Common questions
What is James J. Koster, MD's NPI number?
James J. Koster, MD's National Provider Identifier (NPI) is 1851387344, issued on Sep 21, 2005. An NPI identifies a provider in billing; it is not a license.
Where is James J. Koster, MD located?
The NPPES record lists a practice address at 300 E Osborn RD Ste 100, Phoenix, AZ, 85012. Phone: (480) 994-5012. Providers update this record themselves, so call before visiting.
How can I verify James J. Koster, MD's license?
NPPES lists Arizona license number 32672, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does James J. Koster, MD prescribe under Medicare Part D?
In 2024, James J. Koster, MD had 1,172 Medicare Part D claims for 360 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
What is James J. Koster, MD's MIPS final score?
The 2023 MIPS final score is 95.4 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.