Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Michael M Karkkainen, DO

Surgery Physician in Marinette, WI · enumerated 2006.

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

National Provider Identifier

1821199100

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Registry record

Entity type Individual (Type 1)

Name Dr. Michael M Karkkainen

Credential DO

Sex Male

Practice address 3003 University Dr, Marinette, WI, 54143

Phone (715) 735-8056

Enumeration date Sep 26, 2006

Last updated in NPPES Sep 29, 2025

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 38276 (WI) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier	Type	State	Issuer
114232907	Medicaid	MI	-
30081100	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

How do I verify Michael Karkkainen's NPI record?

Cross-check NPI 1821199100 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1821199100 active?

Yes, as of the latest NPPES snapshot, NPI 1821199100 is active (record last updated 2025-09-29).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-29.