EyeEye MovementsFixation, Ocular
Dr. James C. Ahn, MD
NPI1902915028PAC ID3779658661
- Medicare services, 2024
- 212
- Medicare patients, 2026
- 124
- Part D claims, 2026
- 60
- Publications
- 2
- Affiliated sites
- 2
- Practice address
- 795 El Camino Real, Palo Alto, CA 94301
- Practice phone
- Call (650) 324-1832
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Surgery Center Palo Alto
Surgery Center - Medicare-Certified · Palo Alto, California
Find Dr. Ahn's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. James C. Ahn is an ophthalmologist in Palo Alto, California
Dr. Ahn practices at Surgery Center Palo Alto in Palo Alto, California.
Dr. Ahn's NPI, 1902915028, was assigned on August 30, 2006. Dr. Ahn graduated from Boston University School Of Medicine in 1982. Dr. Ahn holds California license G52250.
NPI and contact details
- NPI
- 1902915028NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3779658661
- NPI enumeration date
- August 30, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (650) 324-1832
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 70
- Medical school graduation
- 1982
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. James C. Ahn practices at Surgery Center Palo Alto in Palo Alto, California
Dr. Ahn's primary practice is Surgery Center Palo Alto, at 795 El Camino Real, Palo Alto, CA 94301. The practice phone is (650) 324-1832.
- Surgery Center Palo Alto795 El Camino Real, Palo Alto, CA 94301Phone(650) 324-1832
Source: Dmand AI Affiliation Data
Dr. James C. Ahn is affiliated with 2 sites of care and 1 medical group
Dr. Ahn's primary practice is Surgery Center Palo Alto in Palo Alto, California. The medical group on file is Palo Alto Foundation Medical Group. Dmand AI also links Dr. Ahn to 1 more group practice or clinic, named with a free account.
Surgery Center Palo AltoPrimary
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. James C. Ahn's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Ahn practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Surgery Center Palo Alto | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. James C. Ahn is one of 2,621 ophthalmologists in California
Ophthalmology is Dr. Ahn's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Ahn is board certified in ophthalmology by the American Board of Ophthalmology. Dr. Ahn is licensed in California.
Specialties and state licenses
- Ophthalmology, CaliforniaPrimary
Clinical focus
Dmand AI lists cataract, conjunctivitis, dry eye, eyelid inflammation, glaucoma and vision problems among the conditions Dr. Ahn treats.
Ophthalmologists near Dr. Ahn
Counts of ophthalmologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. James C. Ahn billed Medicare for 212 services in 2024
CMS data shows 212 Medicare services from Dr. Ahn across 6 procedure codes in 2024, for 124 Medicare patients. Medicare paid $19,304 for them. Every service was in an office.
Medicare services, 2024212
Medicare patients124
Paid by Medicare$19,304
Procedure codes6
Dr. Ahn's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1332024: 1302%
- Tests and treatments
- 2023: 672024: 8222%
Dr. Ahn compared with the California median for ophthalmologists, 2024
- Dr. Ahn
- California median
- Medicare services
- 212vs 1,07980% below
- Medicare patients
- 124vs 42171% below
- Part D claims
- 15vs 61898% below
Medians across 2,568 ophthalmologists in California with Dmand AI profiles that report each measure.
Dr. Ahn's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Ahn?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Ahn and other ophthalmologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. James C. Ahn treated 124 Medicare patients in 2026, average age 77
CMS counts 124 Medicare patients who saw Dr. Ahn in 2026. The largest group is 75 to 84, with 56 patients. 69% of them have high cholesterol, and 53% have high blood pressure. Their average risk score is 0.84, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Ahn's median patient age at 23, with 50% women.
Medicare patients, 2026124
Average age77
Average risk score0.84
Dr. Ahn's Medicare patients by age, 2026
CMS leaves out age groups with fewer than 11 patients.
Dr. Ahn's Medicare patients by sex, 2026
- Women8165%
- Men4335%
Chronic conditions among Dr. Ahn's Medicare patients, 2026
- High cholesterol69%
- High blood pressure53%
- Arthritis42%
- Osteoporosis26%
- Diabetes21%
- Ischemic heart disease19%
- Mood disorders18%
- Anxiety16%
Share of Medicare patients with each condition. A patient can have several.
Dr. Ahn's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 23
Patient panel by sex, all payers
- Women50%
- Men49%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2026 data
Dr. James C. Ahn wrote 60 Medicare Part D claims in 2026
In 2026, Dr. Ahn wrote 60 Medicare Part D claims for 25 patients. 52% of them were for generic drugs. CMS names the drug for 15 of them, across 1 drug with 11 or more claims each, at $132 in total drug cost. In 2023, CMS named 12 claims across 1 drug.
Part D claims, 202660
Drugs named by CMS1
Total drug cost$132
Part D patients25
Dr. Ahn's Part D claims by kind of drug, 2026
- Generic31 claims52%
- Brand-name29 claims48%
Dr. Ahn's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 122024: 1525%
Drugs named by CMS: 1 in 2024, 1 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2026 data
How Dr. James C. Ahn takes part in Medicare
Dr. Ahn accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. James C. Ahn has 2 publications on record
Dmand AI links 2 papers to Dr. Ahn. The most frequent topics are Eye. Dr. Ahn's most frequent co-author is Creig Simmons Hoyt, MD.
Papers2
Topics Dr. Ahn writes about most
- Eye
Dr. Ahn's most frequent co-authors
Recent publications by Dr. Ahn
Am J Ophthalmol
Anesthesia, LocalCentral Nervous System DiseasesEye
See who Dr. Ahn researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Ahn works with, so you can find a warm path to the right ophthalmologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. James C. Ahn graduated from Boston University School Of Medicine
Dr. Ahn graduated from Boston University School Of Medicine in 1982.
- Medical school
- Board certified in ophthalmology
Source: Dmand AI Professional Profile Data
Dr. James C. Ahn accepts plans from 11 insurance carriers
Dr. Ahn is in network with 11 carriers, including Aetna, Elevance and United Healthcare. PPO plans come from the most carriers, 7. Check the plan with the practice before a visit.
- Aetna
- Elevance
- United Healthcare
- Blue Cross Blue Shield of Michigan
- HCSC
- Alliant Health Plans
- Blue Cross and Blue Shield of Kansas City
- CMS Medicare
- +3 more carriersWith a free account
Plan types Dr. Ahn accepts, by number of carriers
- PPO7
- HMO6
- EPO4
- Medicare4
- POS4
Source: Dmand AI Insurance Network Data
Sources for Dr. James C. Ahn's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. James C. Ahn
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. James C. Ahn's NPI number?
Dr. James C. Ahn's NPI number is 1902915028. It was assigned on August 30, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. James C. Ahn?
Dr. James C. Ahn is an ophthalmologist in Palo Alto, California. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. James C. Ahn practice?
Dr. Ahn practices at 795 El Camino Real, Palo Alto, CA 94301. Dr. Ahn's primary practice is Surgery Center Palo Alto in Palo Alto, California. Dmand AI also links Dr. Ahn to 1 group practice or clinic, and a free account names each one.
What is Dr. James C. Ahn's office phone number?
The practice phone on file for Dr. Ahn is (650) 324-1832. Dmand AI also checks direct phone and mobile numbers, available with a free account.
What is Dr. James C. Ahn's email address?
Dmand AI checks professional and personal email addresses for Dr. Ahn through healthcare-specific waterfall enrichment. They are available with a free Dmand AI account.
What is Dr. James C. Ahn's medical license number?
Dr. Ahn holds California license G52250.
What medical group is Dr. James C. Ahn part of?
Dr. Ahn is linked to Palo Alto Foundation Medical Group.
Who does Dr. James C. Ahn practice with?
Dmand AI links 4,288 HCPs to Dr. Ahn's primary medical group, 37 of them ophthalmologists. A free account lists them, with verified contacts.
Does Dr. James C. Ahn accept Medicare?
Yes. CMS data shows Dr. Ahn billed Medicare for 212 services in 2024, and Dr. Ahn accepts Medicare assignment.
How many Medicare patients does Dr. James C. Ahn see?
CMS counts 124 Medicare patients who saw Dr. Ahn in 2026, with an average age of 77.
Show 9 more questionsShow fewer questions
Is Dr. James C. Ahn board certified?
Yes. Dr. Ahn is board certified in ophthalmology by the American Board of Ophthalmology.
What services does Dr. James C. Ahn bill to Medicare?
In 2024, Dr. Ahn's most billed Medicare services were office visit, established patient (99214), eye exam or test (92133) and eye exam or test (92060).
Where did Dr. James C. Ahn go to medical school?
Dr. Ahn graduated from Boston University School Of Medicine in 1982.
What drugs does Dr. James C. Ahn prescribe most?
In 2024 Medicare Part D data, Dr. Ahn's most prescribed drugs by claims were Latanoprost.
How long has Dr. James C. Ahn been practicing?
Dr. Ahn graduated from medical school in 1982, 44 years ago.
Does Dr. James C. Ahn do research?
Dmand AI links 2 publications to Dr. Ahn.
Who does Dr. James C. Ahn publish with?
Dr. Ahn's most frequent co-authors are Creig Simmons Hoyt, MD (1 shared paper).
What EHR does Dr. James C. Ahn's practice use?
Dmand AI tracks the EHR system at Surgery Center Palo Alto and at 1 more affiliated site. The vendor and product are available with a free Dmand AI account.
What insurance does Dr. James C. Ahn accept?
Dr. Ahn is in network with 11 carriers, including Aetna, Elevance and United Healthcare. PPO plans come from the most carriers, 7. Check the plan with the practice before a visit. The full carrier list is available with a free Dmand AI account.
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