Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Jeffrey S. Mastroianni, D.M.D., M.S.

Orthodontics and Dentofacial Orthopedics Dentistry in Glen Carbon, IL · enumerated 2016 · authorized official Jeffrey Mastroianni, Ceo.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1285094862

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Registry record

Entity type Organization (Type 2)

Legal business name Jeffrey S. Mastroianni, D.M.D., M.S.

Other name <Unavail>

Practice address 2220 S State Route 157, Suite 125, Glen Carbon, IL, 62034

Phone (618) 288-0600

Fax (618) 288-8004

Enumeration date Feb 25, 2016

Last updated in NPPES Feb 25, 2016

Taxonomy & classification

1223X0400X Orthodontics and Dentofacial Orthopedics Dentistry Dental Providers · License 21002018 (IL) Primary

Authorized official

Name Jeffrey Mastroianni

Title Ceo

Phone (618) 288-0600

Other identifiers

Identifier	Type	State	Issuer
21002018.	Other	IL	SPECIALTY

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What is a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

What type of organization is Jeffrey S. Mastroianni, D.M.D., M.S.?

Jeffrey S. Mastroianni, D.M.D., M.S. is registered in NPPES as a Orthodontics and Dentofacial Orthopedics Dentistry (its primary provider taxonomy).

Providers at this address

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Jeffrey Mastroianni Orthodontics and Dentofacial Orthopedics Dentistry · Glen Carbon, IL NPI 1326147489 Jeffrey S. Mastroianni D.M.D., M.S., P.C. Orthodontics and Dentofacial Orthopedics Dentistry · Glen Carbon, IL NPI 1528187549 Tracy Karvinen Professional Counselor · Glen Carbon, IL NPI 1609166115 Bethany Horstmann Professional Counselor · Glen Carbon, IL NPI 1942546924 Karvinen Counseling Services, PC Professional Counselor · Glen Carbon, IL NPI 1871984534 Brett Wright Physical Therapist · Glen Carbon, IL NPI 1447909007

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-02-25.