Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. William Yuan To, OD

Individual provider Optometrist · NPI 1952756678

Dr. William Yuan To, OD is an Optometry in San Mateo, California. Qualified in 2016, 10 years ago. Practices with William Y to OD Inc, a 5-clinician group, works from 4 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
10
Licensed in
CA
In the registry since
2016
What do these letters mean?
OD — Doctor of Optometry
An optometrist: examines eyes, prescribes glasses and contacts, and treats many eye conditions.

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Practice location Address checks out

194 Hillsdale Shopping Ctr
San Mateo, CA 94403-3409
Phone: (650) 341-8080
Fax: (650) 341-8565
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 9309 Glacier Hwy Ste A103, Juneau, AK 99801-9300 — (907) 789-3175
  • 377 Santana Row Ste 1115, San Jose, CA 95128-2058 — (408) 502-5020
  • 6000 Bollinger Canyon Rd Ste 1104, San Ramon, CA 94583-2305 — (925) 725-1745

Specialties & licences

Optometrist (primary) Taxonomy 152W00000X · Licence 34153TLG (CA)

Record details

NPI number1952756678
Entity typeIndividual (Type 1)
GenderMale
Credentials OD
Sole proprietorYes
NPI enumeratedMay 2, 2016
Last updated in NPPESSeptember 3, 2025
Certification dateSeptember 3, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyOPTOMETRY
Medical schoolOTHER
Graduated 2016 (10 years in practice)
Group practice William Y To Od Inc — 5 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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