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

William Joseph Ares, MD

Neurological Surgery Physician in Evanston, IL · enumerated 2011.

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

National Provider Identifier

1396039442

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Registry record

Entity type Individual (Type 1)

Name William Joseph Ares

Credential MD

Sex Male

Practice address Evanston, IL, 60201

Phone (847) 570-1440

Fax (847) 570-1442

Enumeration date Jun 7, 2011

Last updated in NPPES Jul 8, 2019

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

Taxonomy & licenses

207T00000X Neurological Surgery Physician Allopathic & Osteopathic Physicians · License 036148890 (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.

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Frequently asked questions

How do I verify William Ares's NPI record?

Cross-check NPI 1396039442 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1396039442 active?

Yes, as of the latest NPPES snapshot, NPI 1396039442 is active (record last updated 2019-07-08).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-07-08.