Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. L. Stephanie Wu, O.D.
Optometrist in Castro Valley, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1770523763
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Registry record
Entity type Individual (Type 1)
Name Dr. L. Stephanie Wu
Credential O.D.
Sex Female
Practice address 22179 Redwood Rd, Castro Valley, CA, 94546
Phone (510) 886-1856
Fax (510) 886-1942
Enumeration date Jun 7, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
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.
Frequently asked questions
Is NPI 1770523763 active?
Yes, as of the latest NPPES snapshot, NPI 1770523763 is active (record last updated 2007-07-08).
How do I verify L. Wu's NPI record?
Cross-check NPI 1770523763 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.