Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Karen To, OD

Optometrist in Campbell, CA · enumerated 2022.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1245958347

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Registry record

Entity type Individual (Type 1)

Name Karen To

Credential OD

Sex Female

Practice address 1875 S Bascom Ave Ste 110, Campbell, CA, 95008

Phone (408) 377-1212

Fax (408) 377-3419

Enumeration date Aug 16, 2022

Last updated in NPPES Oct 18, 2026

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License OD35428-TLG (CA) Primary

152W00000X Optometrist Eye and Vision Services Providers · License OD61312562 (WA) Secondary

OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses. About the OD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Karen To?

Karen To is registered in NPPES with the primary taxonomy of Optometrist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-10-18.