Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. JOHN WILLIAM GILLAN DDS MS
NPI 1417902107
Dentist - Endodontics in Mesa, AZ

Q: What is John Gillan's NPI number?

The NPI number for John Gillan is 1417902107. It was assigned to this individual provider in the NPPES registry on May 23, 2006.

Q: What is John Gillan's specialty?

The primary specialty registered for this NPI is Dentist, specializing in Endodontics, with taxonomy code 1223E0200X.

Q: When was this NPI record last updated?

The NPPES record for John Gillan was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 28 days 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.

Active since May 23, 2006

2220 W SOUTHERN AVENUE, SUITE #102, MESA, AZ 85202(480) 834-7100(480) 833-3134 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

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About Dr. John William Gillan Dds Ms NPPES

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

DR. JOHN WILLIAM GILLAN DDS MS (NPI 1417902107) is an individual endodontics provider in Mesa, Arizona, licensed in Arizona (#2278) and active in the NPI registry since May 2006.

NPPES Registry Identity

NPI1417902107

Entity TypeIndividualMale

Primary Taxonomy1223E0200X

Provider Legal NameDR. JOHN WILLIAM GILLANCredential: DDS MS

Location Address2220 W SOUTHERN AVENUE, SUITE #102Mesa, AZ 85202-4704

Mailing Address2220 W Southern Avenue, Suite #102Mesa, AZ 85202-4704 · (480) 834-7100 · Fax (480) 833-3134

Phone(480) 834-7100

Fax(480) 833-3134

Sole ProprietorNo

Enumeration DateMay 23, 2006

Last NPPES UpdateJuly 13, 2026

✔ NPI 1417902107 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDentist · EndodonticsDental Providers

Taxonomy Code1223E0200X

License✔ Licensed in AZ · #2278

Definition

The branch of dentistry that is concerned with the morphology, physiology and pathology of the human dental pulp and periradicular tissues. Its study and practice encompass the basic and clinical sciences including biology of the normal pulp, the etiology, diagnosis, prevention and treatment of diseases and injuries of the pulp and associated periradicular conditions.

2220 W SOUTHERN AVENUE, Mesa, AZ 85202

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Other Providers at the Same Location NPPES 2

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

ENDODONTIC SPECIALISTS LTD

Dentist (Endodontics)

2220 W SOUTHERN AVENUE, SUITE #102
MESA, AZ 85202

Maricopa County (480) 834-7100

DR. ROBERT ANDREW LEES II DDS MS

Dentist (Endodontics)

2220 W SOUTHERN AVENUE, SUITE 102
MESA, AZ 85202

Maricopa County (480) 834-7100

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 John Gillan's NPI number?

The NPI number for John Gillan is 1417902107. It was assigned to this individual provider in the NPPES registry on May 23, 2006.

Where is John Gillan located?

John Gillan practices at 2220 W Southern Avenue Suite #102, Mesa, AZ 85202. The listed phone number is (480) 834-7100.

What is John Gillan's specialty?

The primary specialty registered for this NPI is Dentist, specializing in Endodontics, with taxonomy code 1223E0200X.

When was this NPI record last updated?

The NPPES record for John Gillan was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 28 days 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.