Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

John L. Sadowski D.D.S., S.C.

Dental Clinic/Center in Manitowoc, WI · enumerated 2008 · authorized official John Sadowski, Dentist/Owner.

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

National Provider Identifier

1205094836

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Registry record

Entity type Organization (Type 2)

Legal business name John L. Sadowski D.D.S., S.C.

Practice address 201 E Waldo Blvd, Manitowoc, WI, 54220

Phone (920) 682-0115

Enumeration date May 30, 2008

Last updated in NPPES Mar 7, 2023

Taxonomy & classification

261QD0000X Dental Clinic/Center Ambulatory Health Care Facilities · License 0548G (WI) Primary

Authorized official

Name John Sadowski

Title Dentist/Owner

Phone (920) 682-0115

Other identifiers

Identifier	Type	State	Issuer
0584G	Other	WI	STATE LICENSE NUMBER
063681003	Other	WI	WDA NUMBER

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 is John L. Sadowski D.D.S., S.C. located?

The practice location on file with NPPES is in Manitowoc, WI.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2023-03-07. Verify at npiregistry.cms.hhs.gov.

Providers at this address

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Warren Marinaccio Dentist · Manitowoc, WI NPI 1700882552 John Sadowski General Practice Dentistry · Manitowoc, WI NPI 1144212101

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-03-07.