Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Aaron M Siegel, MD

Surgery Physician in Gurnee, IL · enumerated 2005.

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

National Provider Identifier

1356332860

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Registry record

Entity type Individual (Type 1)

Name Aaron M Siegel

Credential MD

Sex Male

Practice address 1 S Greenleaf St, Ste A, Gurnee, IL, 60031

Phone (847) 856-2525

Fax (847) 856-1969

Enumeration date Nov 3, 2005

Last updated in NPPES Jun 29, 2010

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 036079055 (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
036079055	Medicaid	IL	-

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

What specialty is Aaron Siegel?

Aaron Siegel is registered in NPPES with the primary taxonomy of Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-06-29.