Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Karl C Larson, M.D.

Family Medicine Physician in Oshkosh, WI · enumerated 2006 · practices at Ascension Medical Group-Fox Valley Wisconsin, Inc.

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

National Provider Identifier

1063528529

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Registry record

Entity type Individual (Type 1)

Name Karl C Larson

Credential M.D.

Sex Male

Practice address 2725 Jackson St, Oshkosh, WI, 54901

Phone (920) 223-7500

Fax (920) 223-7630

Enumeration date Aug 21, 2006

Last updated in NPPES Dec 17, 2009

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 28253 (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
A02401	Other	WI	CIGNA
28253	Other	WI	TOUCHPOINT
3076200	Medicaid	WI	-
080113126	Other	WI	MEDICARE RAILROAD
20021	Other	WI	NETWORK HEALTH
710016	Other	WI	T19 MANAGED HEALTH SERVIC

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

Is NPI 1063528529 active?

Yes, as of the latest NPPES snapshot, NPI 1063528529 is active (record last updated 2009-12-17).

How do I verify Karl Larson's NPI record?

Cross-check NPI 1063528529 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-12-17.