Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Marcus Larrieu, APN

Nurse Practitioner in Oak Lawn, IL · enumerated 2019.

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

National Provider Identifier

1497314397

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Registry record

Entity type Individual (Type 1)

Name Mr. Marcus Larrieu

Credential APN

Sex Male

Practice address 10837 S Cicero Ave, Oak Lawn, IL, 60453

Phone (773) 636-7575

Enumeration date Jun 13, 2019

Last updated in NPPES Jun 13, 2019

Taxonomy & licenses

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 209.019399 (IL) Primary

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 1497314397 active?

Yes, as of the latest NPPES snapshot, NPI 1497314397 is active (record last updated 2019-06-13).

How do I verify Marcus Larrieu's NPI record?

Cross-check NPI 1497314397 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 2019-06-13.