Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Joyce Gertzen, M.D.

Internal Medicine Physician in Oak Forest, IL · enumerated 2006 · practices at John H. Stroger, Jr. Hospital of Cook County.

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

National Provider Identifier

1588740591

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Registry record

Entity type Individual (Type 1)

Name Joyce Gertzen

Credential M.D.

Sex Female

Practice address 15900 South Cicero Ave, Oak Forest, IL, 60452

Phone (708) 687-7200

Fax (708) 633-4136

Enumeration date Oct 31, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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 Joyce Gertzen practice?

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

What is the NPI number for Joyce Gertzen?

The National Provider Identifier (NPI) for Joyce Gertzen is 1588740591, 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 2007-07-08.