Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Emmy Tian

Optometrist in San Francisco, CA · enumerated 2023.

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

National Provider Identifier

1730876467

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Registry record

Entity type Individual (Type 1)

Name Emmy Tian

Sex Female

Practice address 490 Illinois Street, San Francisco, CA, 94158

Phone (415) 353-2020

Enumeration date Apr 21, 2023

Last updated in NPPES Sep 5, 2025

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 35500 (CA) Primary

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.

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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 Emmy Tian?

Emmy Tian 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-05.