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

Dr. John Nicholas Demetropoulos, DDS

General Practice Dentistry in Tomah, WI · enumerated 2006.

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

National Provider Identifier

1891898748

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Registry record

Entity type Individual (Type 1)

Name Dr. John Nicholas Demetropoulos

Credential DDS

Sex Male

Practice address Tomah, WI, 54660

Phone (608) 372-3971

Fax (608) 372-1655

Enumeration date Sep 6, 2006

Last updated in NPPES Jan 26, 2024

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

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers · License 3177-015 (WI) 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

How do I verify John Demetropoulos's NPI record?

Cross-check NPI 1891898748 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1891898748 active?

Yes, as of the latest NPPES snapshot, NPI 1891898748 is active (record last updated 2024-01-26).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-01-26.