Physician Profile
Unclaimed ProfileAbout AHN
James Ahn, M.D. is a healthcare provider in Palo Alto, CA specialising in ophthalmology. James trained at Boston University School of Medicine, graduating in 1982.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What does Dr. Ahn specialise in?
Dr. Ahn is an ophthalmology in Palo Alto, CA. This is the primary taxonomy recorded against the NPI in the federal registry, listed there as “OPHTHALMOLOGY”.
NPI registry
Where is Dr. Ahn located?
Dr. Ahn is listed at 795 EL CAMINO REAL, Palo Alto, CA 94301. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Ahn's phone number?
The number on file is (650) 321-4121. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Dr. Ahn's NPI number?
Dr. Ahn's National Provider Identifier is 1902915028. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Ahn go to medical school?
Dr. Ahn attended Boston University School of Medicine, graduating in 1982. This comes from the CMS National Downloadable File.
CMS public data
How long has Dr. Ahn been practising?
Dr. Ahn has 44 years experience. Calculated from a graduation year of 1982, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Ahn do most often?
According to Medicare billing data, Dr. Ahn provides treatments such as imaging of optic nerve and exam to measure eye deviation and range of motion, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Dr. Ahn confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Ahn. If this is you, claiming it is free.
Guide.md
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (650) 321-4121
- Email not available
Practice Locations
795 EL CAMINO REAL
Palo Alto, CA 94301
Procedures Most Often Billed to Medicare
212 services · 190 patients · 6 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Imaging of optic nerve | Treatment | 92133 |
40 |
| Exam to measure eye deviation and range of motion | Treatment | 92060 |
26 |
| Exam of visual field with extended testing | Treatment | 92083 |
16 |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
85 |
| Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more | Office visit | 99215 |
23 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
22 |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
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Claim this profileRelated providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other ophthalmology specialists in Palo Alto 8
Same specialty, same city.
Trained at Boston University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
More connections — 16 related providers in 2 groups
Class of 1982 at Boston University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Also performs Imaging of optic nerve 8
Providers in CA who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.