Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Anne L. Siwinski, APN

Gerontology Nurse Practitioner in Oak Lawn, IL · enumerated 2022 · practices at Cardiothoracic & Vascular Surgical Associates S C.

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

National Provider Identifier

1669107744

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Registry record

Entity type Individual (Type 1)

Name Anne L. Siwinski

Credential APN

Sex Female

Practice address 4400 W 95th St Ste 308, Oak Lawn, IL, 60453

Phone (708) 346-4040

Fax (708) 346-3287

Enumeration date Jul 21, 2022

Last updated in NPPES Dec 1, 2022

Taxonomy & licenses

363LG0600X Gerontology Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 209025906 (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

What is the NPI number for Anne Siwinski?

The National Provider Identifier (NPI) for Anne Siwinski is 1669107744, a Type 1 (individual) record in the CMS NPPES registry.

Where does Anne Siwinski practice?

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

Other providers at this practice address

Browse all →

Philip Alexander Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Oak Lawn, IL NPI 1437159142 Patroklos Pappas Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Oak Lawn, IL NPI 1265427942 Antone Tatooles Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Oak Lawn, IL NPI 1477548170 Cardiothoracic & Vascular Surgical Associates S C Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Oak Lawn, IL NPI 1780679407 Michael Frank Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Oak Lawn, IL NPI 1427043017 Diana Evans Surgical Physician Assistant · Oak Lawn, IL NPI 1780670141 Henry Sullivan Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Oak Lawn, IL NPI 1831157999 Annie Pauwaa Surgical Physician Assistant · Oak Lawn, IL NPI 1124069778

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-12-01.