Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Mary Theresa Harris, DDS
Dentist in Crystal Lake, IL · enumerated 2017.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1417471327
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Registry record
Entity type Individual (Type 1)
Name Dr. Mary Theresa Harris
Credential DDS
Sex Female
Practice address 1500 Carlemont Dr, Crystal Lake, IL, 60014
Phone (815) 477-2273
Enumeration date Aug 1, 2017
Last updated in NPPES Dec 28, 2020
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 Mary Harris practice?
The practice location on file with NPPES is in Crystal Lake, IL. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Mary Harris?
The National Provider Identifier (NPI) for Mary Harris is 1417471327, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-12-28.