James Ahn, M.D.
Ophthalmology Physician · Palo Alto, CA
James Ahn, M.D. is an ophthalmology physician with a practice address in Palo Alto, California, and NPI 1902915028, issued on Aug 30, 2006. Check the license (California G52250, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- James Ahn
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- G52250 CA
Self-reported in NPPES; status is on the state search - Practice location
- 795 EL Camino Real, Palo Alto, CA 94301
- Phone
- (650) 321-4121
- Enumerated
- Aug 30, 2006
- Record last updated
- Mar 3, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20080812000156); accepts Medicare assignment
- Medical or professional school
- Boston University School Of Medicine, 1982
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →
Also registered at 795 EL Camino Real
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- William Adams, DPMFoot & Ankle Surgery Podiatrist1447487830
Verify James Ahn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G52250Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average ophthalmology physician in 2024
60 Medicare Part D claims for 25 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 48% of claims.
Most prescribed
- Latanoprost15 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.
Bills Medicare through one group practice
- Sutter Bay Medical FoundationPalo Alto, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
James Ahn among 2,899 ophthalmology physician records in California
James Ahn, M.D. is one of 2,899 ophthalmology physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 45% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1982 · median 2001 among the 1,907 with a school on file
- Record last updated2020 · 67% 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 California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in California
There are 2,899 ophthalmology physician records in California.
All 2,899 in California → Every provider in Palo Alto → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Annie Chan, MDPalo Alto, CA 943011346420221
- Susan Connolly, MDPalo Alto, CA 943011861501900
- Jocelyn Delcarmen, M.D.Palo Alto, CA 943011144322579
- Harvey Fishman, M.D.Palo Alto, CA 943011639166838
- Hyunjin Jane Kim, M.D.Palo Alto, CA 943011376765990
- Debbie Kuo, M.D.Palo Alto, CA 943011417222050
- Marc Levin, MDPalo Alto, CA 943011811123441
- Mary Ann Lloyd, MDPalo Alto, CA 943011285743153
Common questions
What is James Ahn, M.D.'s NPI number?
James Ahn, M.D.'s National Provider Identifier (NPI) is 1902915028, issued on Aug 30, 2006. An NPI identifies a provider in billing; it is not a license.
Where is James Ahn, M.D. located?
The NPPES record lists a practice address at 795 EL Camino Real, Palo Alto, CA, 94301. Phone: (650) 321-4121. Providers update this record themselves, so call before visiting.
How can I verify James Ahn, M.D.'s license?
NPPES lists California license number G52250, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does James Ahn, M.D. prescribe under Medicare Part D?
In 2024, James Ahn, M.D. had 60 Medicare Part D claims for 25 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
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.