Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Gregory K. An, DDS, MPH
Endodontics in Redwood City, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1902870587
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Registry record
Entity type Individual (Type 1)
Name Gregory K. An
Credential DDS, MPH
Sex Male
Practice address 1690 Woodside Rd, Suite 209, Redwood City, CA, 94061
Phone (650) 369-2555
Enumeration date Feb 13, 2006
Last updated in NPPES Jan 13, 2014
Taxonomy & licenses
DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees.
About the DDS credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| HV0085 | Other | MA | HARVARD PILGRIM |
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 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 Gregory An?
Gregory An is registered in NPPES with the primary taxonomy of Endodontics. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
Browse all → Jeffrey Lamb General Practice Dentistry · Redwood City, CA NPI 1114918315 Mojgan Ebadi Internal Medicine Physician · Redwood City, CA NPI 1285712257 Darrah Garvin Psychologist · Redwood City, CA NPI 1114135985 Shg Nguyen Dental Corporation General Practice Dentistry · Redwood City, CA NPI 1346538188 Jd Pollard MD PC General Practice Physician · Redwood City, CA NPI 1699658310
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-01-13.