Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Nicholas Robert Zessis, MD

Pediatrics Physician in Chicago, IL · enumerated 2015.

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

National Provider Identifier

1558750430

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Registry record

Entity type Individual (Type 1)

Name Nicholas Robert Zessis

Credential MD

Sex Male

Practice address 225 East Chicago Avenue, Box #152, Chicago, IL, 60611

Phone (312) 227-0078

Fax (312) 227-9525

Enumeration date Jan 15, 2015

Last updated in NPPES May 16, 2019

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 036.148502 (IL) Primary

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 2016020251 (MO) Secondary

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 Nicholas Zessis's NPI record?

Cross-check NPI 1558750430 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1558750430 active?

Yes, as of the latest NPPES snapshot, NPI 1558750430 is active (record last updated 2019-05-16).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-05-16.