Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Gillian Alex, M.D.

Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in Chicago, IL · enumerated 2013.

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

National Provider Identifier

1851730907

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Registry record

Entity type Individual (Type 1)

Name Dr. Gillian Alex

Credential M.D.

Sex Female

Practice address 1653 W Congress Pkwy, Chicago, IL, 60612

Phone (617) 775-4573

Enumeration date Jun 21, 2013

Last updated in NPPES May 3, 2024

Taxonomy & licenses

208G00000X Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Allopathic & Osteopathic Physicians · License 036147043 (IL) Primary

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

Other identifiers

Identifier	Type	State	Issuer
036147043	Other	IL	STATE LICENSE

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 1851730907 active?

Yes, as of the latest NPPES snapshot, NPI 1851730907 is active (record last updated 2024-05-03).

How do I verify Gillian Alex's NPI record?

Cross-check NPI 1851730907 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 2024-05-03.