Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mary Gretchen O Connor, PT

Geriatric Physical Therapist in Grayslake, IL · enumerated 2016 · practices at Grayslake Rehabilitation and Complete Physical Therapy LLC.

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

National Provider Identifier

1861941346

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Registry record

Entity type Individual (Type 1)

Name Mary Gretchen O Connor

Credential PT

Sex Female

Practice address 997 N Corporate Cir, Grayslake, IL, 60030

Phone (847) 223-8001

Enumeration date Sep 26, 2016

Last updated in NPPES Oct 3, 2016

Taxonomy & licenses

2251G0304X Geriatric Physical Therapist Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 070.019894 (IL) Primary

PT · Physical Therapist: A licensed movement specialist treating injury and disability through exercise and rehabilitation. About the PT 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.

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Frequently asked questions

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

Cross-check NPI 1861941346 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1861941346 active?

Yes, as of the latest NPPES snapshot, NPI 1861941346 is active (record last updated 2016-10-03).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-10-03.