Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mary Elizabeth O'Malley

Family Nurse Practitioner in Lake Bluff, IL · enumerated 2025 · practices at Lake Forest Pediatric Associates, Ltd.

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

National Provider Identifier

1639054505

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Registry record

Entity type Individual (Type 1)

Name Mary Elizabeth O'Malley

Sex Female

Practice address 917 Sherwood Dr, Lake Bluff, IL, 60044

Phone (947) 295-1220

Enumeration date Aug 8, 2025

Last updated in NPPES Aug 8, 2025

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 209032914 (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 1639054505 active?

Yes, as of the latest NPPES snapshot, NPI 1639054505 is active (record last updated 2025-08-08).

How do I verify Mary O'Malley's NPI record?

Cross-check NPI 1639054505 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 2025-08-08.