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DR. GREGORY J DUFFNER D.D.S.
NPI 1225340375
Dentist - General Practice in Homewood, IL

Active since July 06, 2010
18040 PARK AVE, HOMEWOOD, IL 60430(708) 792-2779(708) 798-6988 Get Directions Write a Review

NPPES record last updated: October 23, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. Gregory J Duffner D.d.s. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. GREGORY J DUFFNER D.D.S. (NPI 1225340375) is an individual general practice provider in Homewood, Illinois, licensed in Illinois (019-019782) and active in the NPI registry since July 2010.

NPPES Registry Identity

NPI1225340375
Entity TypeIndividualMale
Primary Taxonomy1223G0001X
Provider Legal NameDR. GREGORY J DUFFNERCredential: D.D.S.
Location Address18040 PARK AVEHomewood, IL 60430-1606
Mailing Address18040 Park AveHomewood, IL 60430-1606 · (708) 792-2779 · Fax (708) 798-6988
Phone(708) 792-2779
Fax(708) 798-6988
Sole ProprietorNo
Enumeration DateJuly 6, 2010
Last NPPES UpdateOctober 23, 2025
NPPES CertifiedOctober 23, 2025
✔ NPI 1225340375 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDentist · General PracticeDental Providers
Taxonomy Code1223G0001X
License✔ Licensed in IL · 019-019782
Definition
A general dentist is the primary dental care provider for patients of all ages. The general dentist is responsible for the diagnosis, treatment, management and overall coordination of services related to patients' oral health needs.
18040 PARK AVE, Homewood, IL 60430
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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Montana, Blue Cross and Blue Shield of Oklahoma, Blue Cross and Blue Shield of Texas.Insurance ›

Other Providers at the Same Location NPPES 4

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DRS. KREUZ AND DUFFNER, DDS, LTD.
Dentist (General Practice)
18040 PARK AVE
HOMEWOOD, IL 60430
Cook County (708) 798-6868
DR. REBECCA J HUDSON DMD
Dentist
18040 PARK AVE
HOMEWOOD, IL 60430
Cook County (708) 798-6868
DR. ALEXANDER J DOLINAR DMD
Dentist (General Practice)
18040 PARK AVE
HOMEWOOD, IL 60430
Cook County (708) 792-2779
DR. JAMES J KREUZ SR. D.D.S.
Dentist (General Practice)
18040 PARK AVE
HOMEWOOD, IL 60430
Cook County (708) 792-2779

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Gregory Duffner's NPI number?

The NPI number for Gregory Duffner is 1225340375. It was assigned to this individual provider in the NPPES registry on July 6, 2010.

Where is Gregory Duffner located?

Gregory Duffner practices at 18040 Park Ave, Homewood, IL 60430. The listed phone number is (708) 792-2779.

What is Gregory Duffner's specialty?

The primary specialty registered for this NPI is Dentist, specializing in General Practice, with taxonomy code 1223G0001X.

What insurance does Gregory Duffner accept?

Health plans from Blue Cross and Blue Shield of Montana, Blue Cross and Blue Shield of Oklahoma and Blue Cross and Blue Shield of Texas list Gregory Duffner as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Gregory Duffner was last updated on October 23, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.