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WILLIAM Y. TO, O.D., INC
NPI 1700448925
Optometrist in San Mateo, CA

Active since July 08, 2019
194 HILLSDALE SHOPPING CENTER, SAN MATEO, CA 94403(650) 341-8080(650) 341-8565 Get Directions Write a Review

NPPES record last updated: September 3, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Sep 3, 2025, Mar 20, 2025, Jul 2, 2024 and 6 more (9 updates tracked since 2019).

About William Y. To, O.d., Inc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM Y. TO, O.D., INC (NPI 1700448925), doing business as Lifetime Eyecare By Optical Illusions, is a healthcare organization registered as an optometrist in San Mateo, California and active in the NPI registry since July 2019. The organization maintains 3 additional practice locations and lists Katalina Ashe Rowland Yandell, Chief Operations Officer, as its authorized official.

NPPES Registry Identity

NPI1700448925
Entity TypeOrganization
Primary Taxonomy152W00000X
Legal Business NameWILLIAM Y. TO, O.D., INC
Location Address194 HILLSDALE SHOPPING CENTERSan Mateo, CA 94403-3409
Mailing Address1750 Lundy Ave Unit 612899San Jose, CA 95161-7117 · (408) 960-4498
Phone(650) 341-8080
Fax(650) 341-8565
Organization SubpartNo
Authorized OfficialKatalina Ashe Rowland YandellChief Operations Officer · (425) 445-6120
Enumeration DateJuly 8, 2019
Last NPPES UpdateSeptember 3, 20259 updates tracked since enumeration
NPPES CertifiedSeptember 3, 2025
✔ NPI 1700448925 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOptometristEye and Vision Services Providers
Taxonomy Code152W00000X
Definition
Doctors of optometry (ODs) are the primary health care professionals for the eye. Optometrists examine, diagnose, treat, and manage diseases, injuries, and disorders of the visual system, the eye, and associated structures as well as identify related systemic conditions affecting the eye. An optometrist has completed pre-professional undergraduate education in a college or university and four years of professional education at a college of optometry, leading to the doctor of optometry (O.D.) degree. Some optometrists complete an optional residency in a specific area of practice. Optometrists are eye health care professionals state-licensed to diagnose and treat diseases and disorders of the eye and visual system.
194 HILLSDALE SHOPPING CENTER, San Mateo, CA 94403
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Other Names 5

Doing Business AsLifetime Eyecare By Optical Illusions
Doing Business AsOptical Illusions Of San Jose: An Optometric Practice
Doing Business AsOptical Illusions Of San Mateo: An Optometric Practice
Doing Business AsOptical Illusions Of San Ramon: An Optometric Practice
Doing Business AsOptical Illusions: An Optometric Practice

Secondary Practice Locations 3

Location 19309 Glacier Hwy Ste A103Juneau, AK 99801-9300 · Phone (907) 789-3175 · Fax (844) 903-4362
Location 26000 Bollinger Canyon Rd Ste 1104San Ramon, CA 94583-2305 · Phone (925) 725-1745 · Fax (925) 725-7922
Location 3377 Santana Row Ste 1115San Jose, CA 95128-2058 · Phone (408) 502-5020 · Fax (408) 389-8261

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include BlueCross BlueShield of Tennessee, Premera Blue Cross Blue Shield of Alaska.Insurance ›

Other Providers at the Same Location NPPES 4

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. ERICA NGO O.D.
Optometrist
194 HILLSDALE SHOPPING CENTER
SAN MATEO, CA 94403
San Mateo County (650) 341-8080
PARIS MONTGOMERY OD
Optometrist
194 HILLSDALE SHOPPING CENTER
SAN MATEO, CA 94403
San Mateo County (650) 341-8080
DR. LIZETH GONZALEZ OD
Optometrist
194 HILLSDALE SHOPPING CENTER
SAN MATEO, CA 94403
San Mateo County (650) 341-8080
DR. WILLIAM YUAN TO OD
Optometrist
194 HILLSDALE SHOPPING CENTER
SAN MATEO, CA 94403
San Mateo County (650) 341-8080

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William Y. To, O.D., Inc's NPI number?

The NPI number for William Y. To, O.D., Inc is 1700448925. It was assigned to this organization in the NPPES registry on July 8, 2019. The provider is doing business as Lifetime Eyecare by Optical Illusions, Optical Illusions of San Jose: An Optometric Practice, Optical Illusions of San Mateo: An Optometric Practice and Optical Illusions of San Ramon: An Optometric Practice. Additional names are listed in the Other Names section above.

Where is William Y. To, O.D., Inc located?

William Y. To, O.D., Inc is located at 194 Hillsdale Shopping Center, San Mateo, CA 94403. The listed phone number is (650) 341-8080.

What is William Y. To, O.D., Inc's specialty?

The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.

What insurance does William Y. To, O.D., Inc accept?

Health plans from BlueCross BlueShield of Tennessee and Premera Blue Cross Blue Shield of Alaska list William Y. To, O.D., Inc as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for William Y. To, O.D., Inc was last updated on September 3, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.