Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. John Mazeika, DDS

Q: What is the NPI number for John Mazeika?

The National Provider Identifier (NPI) for John Mazeika is 1871667261, a Type 1 (individual) record in the CMS NPPES registry.

General Practice Dentistry in Oswego, IL · enumerated 2006.

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

National Provider Identifier

1871667261

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Registry record

Entity type Individual (Type 1)

Name Dr. John Mazeika

Credential DDS

Sex Male

Practice address Oswego, IL, 60543

Phone (630) 892-5577

Enumeration date Nov 20, 2006

Last updated in NPPES Jul 8, 2007

Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers Primary

DDS — Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS credential

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

Where does John Mazeika practice?

The practice location on file with NPPES is in Oswego, IL. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for John Mazeika?

The National Provider Identifier (NPI) for John Mazeika is 1871667261, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.