Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Mark L Twichell, DDS
Pediatric Dentistry in Fredonia, NY · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1669410015
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Registry record
Entity type Individual (Type 1)
Name Dr. Mark L Twichell
Credential DDS
Sex Male
Practice address 85 West Main St, Fredonia, NY, 14063
Phone (716) 672-2854
Fax (716) 672-5269
Enumeration date Jun 4, 2006
Last updated in NPPES Nov 27, 2012
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 |
|---|---|---|---|
| 01049536 | Medicaid | NY | - |
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 Mark Twichell practice?
The practice location on file with NPPES is in Fredonia, NY. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Mark Twichell?
The National Provider Identifier (NPI) for Mark Twichell is 1669410015, a Type 1 (individual) record in the CMS NPPES registry.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-11-27.