Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark L Thayer, MD

Surgery Physician in Grantsburg, WI · enumerated 2006.

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

National Provider Identifier

1568424778

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Registry record

Entity type Individual (Type 1)

Name Mark L Thayer

Credential MD

Sex Male

Practice address 257 W Saint George Ave, Grantsburg, WI, 54840

Phone (715) 463-5353

Fax (715) 463-2753

Enumeration date Apr 4, 2006

Last updated in NPPES Jul 21, 2022

Taxonomy & licenses

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 32528 (WI) Secondary

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 31570 (MN) Secondary

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 32528 (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
918723500	Medicaid	MN	-

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 do I verify Mark Thayer's NPI record?

Cross-check NPI 1568424778 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1568424778 active?

Yes, as of the latest NPPES snapshot, NPI 1568424778 is active (record last updated 2022-07-21).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-07-21.