Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Michael Gerard Guignon Sr., MD

Urology Physician in Belleville, IL · enumerated 2006.

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

National Provider Identifier

1700973674

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Registry record

Entity type Individual (Type 1)

Name Michael Gerard Guignon Sr.

Credential MD

Sex Male

Practice address 4550 Memorial Dr, Ste. 280, Belleville, IL, 62226

Phone (618) 277-3109

Fax (618) 277-3143

Enumeration date Oct 10, 2006

Last updated in NPPES Mar 7, 2023

Taxonomy & licenses

208800000X Urology Physician Allopathic & Osteopathic Physicians · License 036075467 (IL) 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
R2D91	Other	MO	LICENSE
036075467	Medicaid	IL	-

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

What specialty is Michael Guignon?

Michael Guignon is registered in NPPES with the primary taxonomy of Urology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

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