Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Christopher John Duffy, D.D.S.
Prosthodontics in Mamaroneck, NY · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1679786321
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Registry record
Entity type Individual (Type 1)
Name Dr. Christopher John Duffy
Credential D.D.S.
Sex Male
Practice address 1600 Harrison Avenue, Suite 301, Mamaroneck, NY, 10543
Phone (914) 381-7208
Fax (914) 381-0592
Enumeration date May 8, 2007
Last updated in NPPES Jul 8, 2007
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
Where does Christopher Duffy practice?
The practice location on file with NPPES is in Mamaroneck, NY. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Christopher Duffy?
The National Provider Identifier (NPI) for Christopher Duffy is 1679786321, 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 2007-07-08.