Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Marc John Czarnowski, D.M.D.

General Practice Dentistry in Mansfield Center, CT · enumerated 2007.

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

National Provider Identifier

1275650699

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Registry record

Entity type Individual (Type 1)

Name Dr. Marc John Czarnowski

Credential D.M.D.

Sex Male

Practice address 10 Higgins Hwy, Suite 1, Mansfield Center, CT, 06250

Phone (860) 456-2906

Enumeration date Mar 22, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers · License 6192 (CT) Primary

DMD · Doctor of Medicine in Dentistry: A licensed dentist; DMD and DDS are equivalent dental degrees. About the DMD 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 Marc Czarnowski practice?

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

What is the NPI number for Marc Czarnowski?

The National Provider Identifier (NPI) for Marc Czarnowski is 1275650699, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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