Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Mary Elizabeth Guzek, D.M.D.
Endodontics in Charlestown, MA · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1124213111
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Registry record
Entity type Individual (Type 1)
Name Dr. Mary Elizabeth Guzek
Credential D.M.D.
Sex Female
Practice address 69 High St, Unit#1, Charlestown, MA, 02129
Phone (917) 386-8803
Fax (617) 337-5711
Enumeration date Sep 12, 2007
Last updated in NPPES Apr 3, 2010
Taxonomy & licenses
DMD · Doctor of Medicine in Dentistry: A licensed dentist; DMD and DDS are equivalent dental degrees.
About the DMD 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 Mary Guzek practice?
The practice location on file with NPPES is in Charlestown, MA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Mary Guzek?
The National Provider Identifier (NPI) for Mary Guzek is 1124213111, a Type 1 (individual) record in the CMS NPPES registry.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-04-03.