Independent US Healthcare Provider Directory & Public Medical Database
Active NPI 1376604678 Individual Practitioner Male Practitioner

Dr. John Mark Leib , DMD

Dentist • O Fallon, IL

Professional Overview & Biography Verified Profile Summary

Dr. John Leib, DMD is a registered healthcare professional specializing in Dentist in O Fallon, IL. Practice services are available at 741 W STATE ST under active NPI credentials.

Practice Location & Contact Primary Location

Practice Address

741 W State St
Suite 3

O Fallon, IL 622691971

Telephone 6186281800
Fax 6186283406
Associated Practice Facility / Clinic

Specialty Benchmarks & Practice Insights

Comparative analytics for Dentist in O Fallon, IL

Active Practitioner
Practitioner Clinical Experience
Active
City Avg: 10.5 Yrs
State Avg: 12.1 Yrs
Regional Practice Density
12 Specialists

Practicing in O Fallon, IL (4751 Statewide)

Telehealth Adoption Rate
0.0% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount
67.4% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Medical Specialties & State Licenses

Dentist Primary Specialty

NUCC Taxonomy Code: 122300000X

A dentist is a person qualified by a doctorate in dental surgery (D.D.S.) or dental medicine (D.M.D.), licensed by the state to practice dentistry, and practicing within the scope of that license. There is no difference between the two degrees: dentists who have a DMD or DDS have the same education. Universities have the prerogative to determine what degree is awarded. Both degrees use the same curriculum requirements set by the American Dental Association's Commission on Dental Accreditation. Generally, three or more years of undergraduate education plus four years of dental school is required to graduate and become a general dentist. State licensing boards accept either degree as equivalent, and both degrees allow licensed individuals to practice the same scope of general dentistry. Additional post-graduate training is required to become a dental specialist.

Dentist - Oral and Maxillofacial Surgery

NUCC Taxonomy Code: 1223S0112X

The specialty of dentistry which includes the diagnosis, surgical and adjunctive treatment of diseases, injuries and defects involving both the functional and esthetic aspects of the hard and soft tissues of the oral and maxillofacial region.

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

1 Associated Practitioners
NPI 1659431500

Doctor of Dental Surgery

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

6 Historical Events
NPI Profile Active July 08, 2007

NPI status registered as active in NPPES database

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Updated Practice Location July 08, 2007

Registered at 741 W STATE ST, SUITE 3, O FALLON, IL 622691971 (Tel: 6186281800)

📍
Updated Business Mailing Address July 08, 2007

Registered at 741 W STATE ST, SUITE 3, O FALLON, IL 622691971 (Tel: 6186281800)

👤
Provider Name / Credentials Updated July 08, 2007

Recorded as JOHN LEIB, D.M.D.

🎓
Medical Taxonomy / Specialty Registered (Primary Specialty) July 08, 2007

Dentist

🟢
Initial NPI Registration & Enumeration December 12, 2006

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1376604678
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: December 12, 2006
Last Update: September 11, 2025
Sole Proprietor: No

Mailing Address

741 W State St, Suite 3

O Fallon, IL 622691971

Phone: 6186281800

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).
⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.