Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Gary P Mayeux, MD

Q: What is the NPI number for Gary Mayeux?

The National Provider Identifier (NPI) for Gary Mayeux is 1518077684, a Type 1 (individual) record in the CMS NPPES registry.

Gastroenterology Physician in Marshfield, WI · enumerated 2006.

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

National Provider Identifier

1518077684

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Registry record

Entity type Individual (Type 1)

Name Gary P Mayeux

Credential MD

Sex Male

Practice address 1000 N Oak Ave, Marshfield, WI, 54449

Phone (715) 221-7822

Enumeration date Aug 30, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207RG0100X Gastroenterology Physician Allopathic & Osteopathic Physicians · License 31013 (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
31598200	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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Gary Mayeux?

The National Provider Identifier (NPI) for Gary Mayeux is 1518077684, a Type 1 (individual) record in the CMS NPPES registry.

Where does Gary Mayeux practice?

The practice location on file with NPPES is in Marshfield, WI. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.