William Yuan To, OD
Optometrist · San Mateo, CA
William Yuan To, OD is an optometrist with a practice address in San Mateo, California, and NPI 1952756678, issued on May 2, 2016. Check the license (California 34153TLG, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- William Yuan To
- Credential
- OD
- Primary taxonomy
- Optometrist 152W00000X
- License number
- 34153TLG CA
Self-reported in NPPES; status is on the state search - Practice location
- 194 Hillsdale Shopping Center, San Mateo, CA 94403
- Phone
- (650) 341-8080
- Enumerated
- May 2, 2016
- Record last updated
- Sep 3, 2025
- Fax
- (650) 341-8565
- Medicare enrollment
- Enrolled (PECOS I20190122003125); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest optometrist records → All 8,308 in California → Look up another NPI →
Also registered at 194 Hillsdale Shopping Center
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lizeth Gonzalez, ODOptometrist1598376113
- Paris Montgomery, ODOptometrist1134737794
- Erica Ngo, O.D.Optometrist1124575790
Verify William Yuan To in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 34153TLGCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
49% more Medicare Part D claims than the average optometrist in 2024
412 Medicare Part D claims for 83 beneficiaries, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D. Brand-name drugs were 60% of claims.
Most prescribed
- Latanoprost103 claims
- Vyzulta49 claims
- Lumigan44 claims
- Dorzolamide-Timolol37 claims
- Timolol Maleate25 claims
- Xiidra20 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.
Industry payments in 2024: $2,010.49
19 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.
Bills Medicare through one group practice
- William Y TO OD IncSan Mateo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William Yuan To among 8,308 optometrist records in California
William Yuan To, OD 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 2016, is newer than 73% of them.
- NPI issued2016 · 73% of these records are older, 24% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 43% of these records are
- Graduated2016 · median 2008 among the 3,573 with a school on file
- Record last updated2025 · 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).
Optometrist providers in California
There are 8,308 optometrist records in California.
All 8,308 in California → Every provider in San Mateo → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- Karen Collom, ODSan Mateo, CA 944031104887629
- Juleanne Clarice Dino, ODSan Mateo, CA 944031730866161
- Lizeth Gonzalez, ODSan Mateo, CA 944031598376113
- Karen Herzig, ODSan Mateo, CA 944031649964909
- Cynthia Huang, ODSan Mateo, CA 944031538771068
- Minjung Lew, O.D.San Mateo, CA 944031639264179
- Paris Montgomery, ODSan Mateo, CA 944031134737794
- Erica Ngo, O.D.San Mateo, CA 944031124575790
Common questions
What is William Yuan To, OD's NPI number?
William Yuan To, OD's National Provider Identifier (NPI) is 1952756678, issued on May 2, 2016. An NPI identifies a provider in billing; it is not a license.
Where is William Yuan To, OD located?
The NPPES record lists a practice address at 194 Hillsdale Shopping Center, San Mateo, CA, 94403. Phone: (650) 341-8080. Providers update this record themselves, so call before visiting.
How can I verify William Yuan To, OD's license?
NPPES lists California license number 34153TLG, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does William Yuan To, OD prescribe under Medicare Part D?
In 2024, William Yuan To, OD had 412 Medicare Part D claims for 83 beneficiaries; 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.