Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Lauren J Marchefka, FNP

Family Nurse Practitioner in Saint Johns, FL · enumerated 2013.

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

National Provider Identifier

1538590021

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Registry record

Entity type Individual (Type 1)

Name Lauren J Marchefka

Credential FNP

Sex Female

Practice address Saint Johns, FL, 32259

Phone (904) 922-3258

Fax (904) 664-5643

Enumeration date Dec 9, 2013

Last updated in NPPES Aug 13, 2026

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 11026734 (FL) Primary

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 95000148 (CA) Secondary

363LP0808X Psychiatric/Mental Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 11026734 (FL) Secondary

FNP · Family Nurse Practitioner: A nurse practitioner certified in family practice across the lifespan. About the FNP credential

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 Lauren Marchefka practice?

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

What is the NPI number for Lauren Marchefka?

The National Provider Identifier (NPI) for Lauren Marchefka is 1538590021, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-08-13.