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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mary Kay Larson, APN

Nurse Practitioner in Warrenville, IL · enumerated 2008 · practices at Cdh Cancer Center.

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

National Provider Identifier

1124293691

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Registry record

Entity type Individual (Type 1)
Name Mary Kay Larson
Credential APN
Sex Female
Practice address 4405 Weaver Pkwy, Warrenville, IL, 60555
Phone (630) 352-5450
Fax (630) 352-5499
Enumeration date Apr 25, 2008
Last updated in NPPES Apr 22, 2013

Taxonomy & licenses

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 209006678 (IL) Primary

Other identifiers

Identifier Type State Issuer
206147214 Other IL MEDICARE PTAN (INDIVIDUAL)

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 1124293691 active?
Yes, as of the latest NPPES snapshot, NPI 1124293691 is active (record last updated 2013-04-22).
How do I verify Mary Kay Larson's NPI record?
Cross-check NPI 1124293691 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 2013-04-22.