Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Juan F Diaz, M.D.

Interventional Cardiology Physician in Fond Du Lac, WI · enumerated 2006.

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

National Provider Identifier

1780793737

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Registry record

Entity type Individual (Type 1)

Name Juan F Diaz

Credential M.D.

Sex Male

Practice address 420 E Division St, Fond Du Lac, WI, 54935

Phone (920) 926-8230

Enumeration date Aug 30, 2006

Last updated in NPPES Dec 23, 2020

Taxonomy & licenses

207RI0011X Interventional Cardiology Physician Allopathic & Osteopathic Physicians · License 41345 (WI) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
060057673	Other	WI	RAILROAD MEDICARE
32603400	Medicaid	WI	-

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

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Juan Diaz?

Juan Diaz is registered in NPPES with the primary taxonomy of Interventional Cardiology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-12-23.