Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Gregory S Siegel, DC
Chiropractor in Whittier, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1801800297
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Registry record
Entity type Individual (Type 1)
Name Gregory S Siegel
Credential DC
Sex Male
Practice address 12640 E Whittier Blvd, Whittier, CA, 90602
Phone (562) 945-2305
Fax (562) 698-1057
Enumeration date Jul 28, 2006
Last updated in NPPES Jun 18, 2008
Taxonomy & licenses
DC · Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders.
About the DC 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 Gregory Siegel practice?
The practice location on file with NPPES is in Whittier, CA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Gregory Siegel?
The National Provider Identifier (NPI) for Gregory Siegel is 1801800297, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-06-18.