Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Joan T. Harney Gnadt, MD, Sc

Cardiovascular Disease Physician in Mequon, WI · enumerated 2007 · authorized official Joan Gnadt, President.

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

National Provider Identifier

1164611497

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Registry record

Entity type Organization (Type 2)

Legal business name Joan T. Harney Gnadt, MD, Sc

Practice address 13133 N Port Washington Rd, Suite 11, Mequon, WI, 53097

Phone (262) 243-6000

Fax (262) 243-6007

Enumeration date Oct 23, 2007

Last updated in NPPES Dec 9, 2010

Taxonomy & classification

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License 28835 (WI) Primary

Authorized official

Name Joan Gnadt

Title President

Phone (262) 243-6000

Other identifiers

Identifier	Type	State	Issuer
28835	Other	WI	WI LICENCE

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.

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Frequently asked questions

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2010-12-09. Verify at npiregistry.cms.hhs.gov.

Where is Joan T. Harney Gnadt, MD, Sc located?

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

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-12-09.