Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mary Kathryn Clark, DNP, APRN, FNP-BC

Q: What is the NPI number for Mary Clark?

The National Provider Identifier (NPI) for Mary Clark is 1518889591, a Type 1 (individual) record in the CMS NPPES registry.

Family Nurse Practitioner in Elmwood Park, IL · enumerated 2026.

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

National Provider Identifier

1518889591

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Registry record

Entity type Individual (Type 1)

Name Mary Kathryn Clark

Credential DNP, APRN, FNP-BC

Sex Female

Practice address 1950 N Harlem Ave, Elmwood Park, IL, 60707

Phone (708) 453-6800

Enumeration date Jul 29, 2026

Last updated in NPPES Jul 29, 2026

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 209036201 (IL) Primary

DNP · Doctor of Nursing Practice: A clinical doctorate for advanced practice nurses. About the DNP 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 Mary Clark practice?

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

What is the NPI number for Mary Clark?

The National Provider Identifier (NPI) for Mary Clark is 1518889591, 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 2026-07-29.