What is John Leib's NPI number?

John Leib's National Provider Identifier (NPI) is 1376604678, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is John Leib's specialty?

John Leib is listed in the NPPES registry with a primary specialty of Dentist (Dental Providers).

Where is John Leib located?

John Leib's practice location on file with NPPES is 741 W State St, O Fallon, IL 62269-1971.

What is John Leib's phone number?

The practice phone number listed in the NPPES registry for John Leib is (618) 628-1800.

Is John Leib's NPI active?

Yes — John Leib's NPI (1376604678) is active in the NPPES registry as of the last update on 2025-09-11.

IndividualActive

John Leib, D.M.D.

NPI 1376604678 · Dentist · O Fallon, IL

John Leib, D.M.D. is a Dentist provider in O Fallon, IL (NPI 1376604678).

Provider details

NPI number: 1376604678
Entity type: Individual
Primary specialty: DentistDental Providers
Credential: D.M.D.
Sex: Male
Sole proprietor: No

Specialties & taxonomies

DentistPrimary122300000X
Dental Providers
Oral and Maxillofacial Surgery (Dentist)1223S0112X
Dental Providers

Profile Score

Detailed profile(83/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure38% of score
19 yrs in NPPES registry
Profile completeness38% of score
83% of core fields populated
Practice footprint23% of score
1 documented practice location

Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

Practice location

741 W State St

Suite 3

O Fallon, IL 62269-1971

Phone: (618) 628-1800

Fax: (618) 628-3406

Street-level locationGet directions

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Mailing address