Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Karen Jang Herzig, OD
Optometrist in San Mateo, CA · enumerated 2023.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1649964909
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Registry record
Entity type Individual (Type 1)
Name Karen Jang Herzig
Credential OD
Sex Female
Practice address 627 Cuesta Ave, San Mateo, CA, 94403
Phone (650) 678-9967
Enumeration date Jun 7, 2023
Last updated in NPPES Jun 7, 2023
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
Where does Karen Herzig practice?
The practice location on file with NPPES is in San Mateo, CA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Karen Herzig?
The National Provider Identifier (NPI) for Karen Herzig is 1649964909, a Type 1 (individual) record in the CMS NPPES registry.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-06-07.