Janet Youngeun Ko, O.D.
Optometrist · San Leandro, CA
Janet Youngeun Ko, O.D. is an optometrist with a practice address in San Leandro, California, and NPI 1932575388, issued on Aug 19, 2015. Check the license (California 15344, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Janet Youngeun Ko
- Credential
- O.D.
- Primary taxonomy
- Optometrist 152W00000X
- License number
- 15344 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1598 Washington Ave, San Leandro, CA 94577
- Phone
- (510) 895-2116
- Enumerated
- Aug 19, 2015
- Record last updated
- Aug 26, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (510) 895-9036
- Entity
- Type 1 · individual
8 nearest optometrist records → All 8,308 in California → Look up another NPI →
Also registered at 1598 Washington Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Janet Youngeun Ko in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 15344Check 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 optometrist in 2024
12 Medicare Part D claims, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D.
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.
Industry payments in 2024: $66.86
3 payments; by number, the most common kind was food and beverage; the largest payer was Alcon Vision LLC. The 34,453 providers of this specialty with any payment received $769.99 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.
Janet Youngeun Ko among 8,308 optometrist records in California
Janet Youngeun Ko, O.D. is one of 8,308 optometrist records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 71% of them.
- NPI issued2015 · 71% of these records are older, 27% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileNo · 43% of these records are
- Record last updated2016 · 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 152W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
40 optometrist records list a practice address in San Leandro
They are 40 of the 4,976 NPPES records with a practice address in San Leandro, and 8,308 optometrist records in California.
All 8,308 in California → Every provider in San Leandro → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- Yukako Akera, O.D.San Leandro, CA 945771972534907
- Gordon Epstein, O.D.San Leandro, CA 945771861562761
- Rosario Flores, O.D.San Leandro, CA 945771639399983
- Ahgee Guo, OPTMETRISTSan Leandro, CA 945771215086822
- Gary Hagan, O.D.San Leandro, CA 945771124184502
- Eddy Haw, O.D.San Leandro, CA 945771801885736
- Elliot Kamin, O.D.San Leandro, CA 945771033269683
- Henri Kim, O.D.San Leandro, CA 945771861516478
Common questions
What is Janet Youngeun Ko, O.D.'s NPI number?
Janet Youngeun Ko, O.D.'s National Provider Identifier (NPI) is 1932575388, issued on Aug 19, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Janet Youngeun Ko, O.D. located?
The NPPES record lists a practice address at 1598 Washington Ave, San Leandro, CA, 94577. Phone: (510) 895-2116. Providers update this record themselves, so call before visiting.
How can I verify Janet Youngeun Ko, O.D.'s license?
NPPES lists California license number 15344, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Janet Youngeun Ko, O.D. prescribe under Medicare Part D?
In 2024, Janet Youngeun Ko, O.D. had 12 Medicare Part D claims; the average among optometrist prescribers was 277. 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.