Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Alexander Mazur, MD

Clinical Cardiac Electrophysiology Physician in Chicago, IL · enumerated 2007.

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

National Provider Identifier

1710172515

Verified

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Registry record

Entity type Individual (Type 1)

Name Alexander Mazur

Credential MD

Sex Male

Practice address 1725 W Harrison St Ste 1159, Chicago, IL, 60612

Phone (312) 942-5020

Enumeration date Sep 14, 2007

Last updated in NPPES May 24, 2022

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 37476 (IA) Secondary

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License 37476 (IA) Secondary

207RI0011X Interventional Cardiology Physician Allopathic & Osteopathic Physicians · License 37476 (IA) Secondary

207RC0001X Clinical Cardiac Electrophysiology Physician Allopathic & Osteopathic Physicians · License 37476 (IA) Secondary

207RC0001X Clinical Cardiac Electrophysiology Physician Allopathic & Osteopathic Physicians · License 036123579 (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
71363	Other	IA	WELLMARK BCBS

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

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.

What specialty is Alexander Mazur?

Alexander Mazur is registered in NPPES with the primary taxonomy of Clinical Cardiac Electrophysiology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-05-24.