Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Denise Nicole Duffy, O.D.
Optometrist in Clinton Twp, MI · enumerated 2016.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1659721231
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Registry record
Entity type Individual (Type 1)
Name Dr. Denise Nicole Duffy
Credential O.D.
Sex Female
Practice address 42550 Garfield Rd, Suite 101, Clinton Twp, MI, 48038
Phone (586) 263-9708
Fax (586) 263-0280
Enumeration date Jun 15, 2016
Last updated in NPPES Jun 15, 2016
Taxonomy & licenses
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD 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 Denise Duffy practice?
The practice location on file with NPPES is in Clinton Twp, MI. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Denise Duffy?
The National Provider Identifier (NPI) for Denise Duffy is 1659721231, 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 2016-06-15.