Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Krystian K Kozak, MD

Hospitalist Physician in Marinette, WI · enumerated 2015.

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

National Provider Identifier

1336522531

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Registry record

Entity type Individual (Type 1)

Name Krystian K Kozak

Credential MD

Sex Male

Practice address 3003 University Dr, Marinette, WI, 54143

Phone (715) 735-4200

Enumeration date Jul 7, 2015

Last updated in NPPES Mar 5, 2024

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 68055 (WI) Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License N68055-20 (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
100075430	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

Where does Krystian Kozak practice?

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

What is the NPI number for Krystian Kozak?

The National Provider Identifier (NPI) for Krystian Kozak is 1336522531, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-03-05.