John Mark Leib, D.M.D.
Dentist · O Fallon, IL
John Mark Leib, D.M.D. is a dentist with a practice address in O Fallon, Illinois, and NPI 1376604678, issued on Dec 12, 2006. Check the license with the Illinois board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- John Mark Leib
- Credential
- D.M.D.
- Primary taxonomy
- Dentist 122300000X
- Practice location
- 741 W State St, O Fallon, IL 62269
- Phone
- (618) 628-1800
- Enumerated
- Dec 12, 2006
- Record last updated
- Sep 11, 2025
- Fax
- (618) 628-3406
- Entity
- Type 1 · individual
Also registered at 741 W State St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Tonya Bowman, D.M.D.General Practice Dentistry1669482345
- Lauren Brauer, DMDGeneral Practice Dentistry1770143075
- Brittany Gilbreth, D.M.DDentist1285049825
- Ava Hood-Olson, D.M.D.Orthodontics and Dentofacial Orthopedics Dentistry1528166253
- Kirk Satrom, D.D.S., M.S.Orthodontics and Dentofacial Orthopedics Dentistry1386788768
- Kara Schreder, D.M.D.General Practice Dentistry1285788356
Verify John Mark Leib in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
12 dentist records list a practice address in O Fallon
They are 12 of the 1,077 NPPES records with a practice address in O Fallon, and 4,522 dentist records in Illinois. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 12 in O Fallon → All 4,522 in Illinois → Every provider in O Fallon →
Other dentist records in Illinois
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- Gilbert Abadilla, DDSBloomingdale, IL1710003686
- Marwan Abbas, DMDChicago, IL1912490749
- David Abbott, D.D.S.Wheaton, IL1114133733
- Abdallah AbboudChicago, IL1962702068
- Nancy Abdala, D.D.S.Chicago, IL1467682302
- Fathi Abdallah, DMDOak Lawn, IL1447827225
- Ghassan Abdallah, DMDOak Lawn, IL1720179021
- Housam Abdallah, DMDJoliet, IL1811673973
Common questions
What is John Mark Leib, D.M.D.'s NPI number?
John Mark Leib, D.M.D.'s National Provider Identifier (NPI) is 1376604678, issued on Dec 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Mark Leib, D.M.D. located?
The NPPES record lists a practice address at 741 W State St, O Fallon, IL, 62269. Phone: (618) 628-1800. Providers update this record themselves, so call before visiting.
How can I verify John Mark Leib, D.M.D.'s license?
Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.