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

Ashley Jillian Williamson, M.D.

Vascular Surgery Physician in Chicago, IL · enumerated 2015.

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

National Provider Identifier

1548640386

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Registry record

Entity type Individual (Type 1)

Name Ashley Jillian Williamson

Credential M.D.

Sex Female

Practice address Chicago, IL, 60637

Phone (773) 753-1880

Fax (773) 702-2140

Enumeration date Jun 7, 2015

Last updated in NPPES Jun 5, 2025

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

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 125066659 (IL) Secondary

2086S0129X Vascular Surgery Physician Allopathic & Osteopathic Physicians · License 01094916A (IN) Secondary

2086S0129X Vascular Surgery Physician Allopathic & Osteopathic Physicians · License 036143888 (IL) 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

What specialty is Ashley Williamson?

Ashley Williamson is registered in NPPES with the primary taxonomy of Vascular 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 2025-06-05.