Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Ellen Nai-Yu Chen, D.D.S.
Dentist in Diamond Bar, CA · enumerated 2015.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1275915936
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Registry record
Entity type Individual (Type 1)
Name Ellen Nai-Yu Chen
Credential D.D.S.
Sex Female
Practice address 1578 Emerald Lane, Diamond Bar, CA, 91765
Phone (909) 345-7095
Enumeration date Jun 18, 2015
Last updated in NPPES Jun 18, 2015
Taxonomy & licenses
DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees.
About the DDS 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
What is the NPI number for Ellen Chen?
The National Provider Identifier (NPI) for Ellen Chen is 1275915936, a Type 1 (individual) record in the CMS NPPES registry.
Where does Ellen Chen practice?
The practice location on file with NPPES is in Diamond Bar, CA. Providers can have multiple locations; NPPES lists the primary practice address.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2015-06-18.