William Y. To, O.D., Inc
NPI 1700448925 · Optometrist · San Mateo, CA
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Y. To, O.D., Inc is a Optometrist organization in San Mateo, CA (NPI 1700448925).
Provider details
- NPI number
- 1700448925
- Entity type
- Organization
- Primary specialty
- OptometristEye and Vision Services Providers
- Organization subpart
- No
- Authorized official
- Katalina Yandell, Chief Operations Officer(425) 445-6120
Specialties & taxonomies
Eye and Vision Services Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
6 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
4 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Other names (DBA / former)
- Doing business as
- Lifetime Eyecare By Optical Illusions
- Doing business as
- Optical Illusions of San Jose: an Optometric Practice
- Doing business as
- Optical Illusions of San Mateo: an Optometric Practice
- Doing business as
- Optical Illusions of San Mateo: an Optometric Practice
- Doing business as
- Optical Illusions of San Ramon: an Optometric Practice
- Doing business as
- Optical Illusions: an Optometric Practice
Additional practice locations (3)
- 9309 Glacier Hwy Ste A103Juneau, AK 99801-9300Phone: (907) 789-3175Fax: (844) 903-4362
- 377 Santana Row Ste 1115San Jose, CA 95128-2058Phone: (408) 502-5020Fax: (408) 389-8261
- 6000 Bollinger Canyon Rd Ste 1104San Ramon, CA 94583-2305Phone: (925) 725-1745Fax: (925) 725-7922
Registry dates
- Enumerated
- 2019-07-08
- Last updated
- 2025-09-03
- Certified
- 2025-09-03
Frequently asked questions
- What is William Y. To, O.D., Inc's NPI number?
- William Y. To, O.D., Inc's National Provider Identifier (NPI) is 1700448925, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is William Y. To, O.D., Inc?
- William Y. To, O.D., Inc is classified in the NPPES registry as Optometrist (Eye and Vision Services Providers).
- Where is William Y. To, O.D., Inc located?
- William Y. To, O.D., Inc's practice location on file with NPPES is 194 Hillsdale Shopping Center, San Mateo, CA 94403-3409.
- What is William Y. To, O.D., Inc's phone number?
- The practice phone number listed in the NPPES registry for William Y. To, O.D., Inc is (650) 341-8080.
- Does William Y. To, O.D., Inc accept Medicare?
- William Y. To, O.D., Inc is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for William Y. To, O.D., Inc?
- The authorized official listed on William Y. To, O.D., Inc's NPPES record is Katalina Yandell, Chief Operations Officer. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is William Y. To, O.D., Inc's NPI active?
- Yes — William Y. To, O.D., Inc's NPI (1700448925) is active in the NPPES registry as of the last update on 2025-09-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.