Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Maria W. Yiu, PH.D.

Clinical Medical Laboratory in San Francisco, CA · enumerated 2008.

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

National Provider Identifier

1770756967

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Registry record

Entity type Individual (Type 1)

Name Maria W. Yiu

Credential PH.D.

Sex Female

Practice address San Francisco, CA, 94143

Phone (415) 353-4809

Fax (415) 353-4828

Enumeration date Apr 8, 2008

Last updated in NPPES Apr 8, 2008

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

291U00000X Clinical Medical Laboratory Laboratories · License DRM47 (CA) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD 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 NPI 1770756967 active?

Yes, as of the latest NPPES snapshot, NPI 1770756967 is active (record last updated 2008-04-08).

How do I verify Maria Yiu's NPI record?

Cross-check NPI 1770756967 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-04-08.