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

Brenda Grzenia

Hematology & Oncology Physician in Orland Park, IL · enumerated 2023.

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

National Provider Identifier

1376317388

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Registry record

Entity type Individual (Type 1)

Name Brenda Grzenia

Sex Female

Practice address Orland Park, IL, 60487

Phone (815) 300-7764

Enumeration date Nov 9, 2023

Last updated in NPPES Aug 27, 2024

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

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 209028719 (IL) Secondary

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 209028719 (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.

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Frequently asked questions

How do I verify Brenda Grzenia's NPI record?

Cross-check NPI 1376317388 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1376317388 active?

Yes, as of the latest NPPES snapshot, NPI 1376317388 is active (record last updated 2024-08-27).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-08-27.