Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Tomasz A Kosierkiewicz X, MD

Neurology Physician in Mount Vernon, IL · enumerated 2005.

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

National Provider Identifier

1487645776

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Registry record

Entity type Individual (Type 1)

Name Tomasz A Kosierkiewicz X

Credential MD

Sex Male

Practice address 2605 Main St, Mount Vernon, IL, 62864

Phone (618) 242-7350

Enumeration date Nov 4, 2005

Last updated in NPPES Feb 21, 2012

Taxonomy & licenses

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License 036104826 (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
463609	Other	IL	HEALTHLINK
04130321	Other	IL	BCBS
130024619	Other	IL	RAILROAD MEDICARE
0361048261	Medicaid	IL	-
078159	Other	IL	HEALTH ALLIANCE

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 Tomasz Kosierkiewicz?

Tomasz Kosierkiewicz is registered in NPPES with the primary taxonomy of Neurology 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.

Other providers at this practice address

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Mt Vernon Neurology, S.C. Neurology Physician · Mount Vernon, IL NPI 1720079015 Anton Schittek Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Mount Vernon, IL NPI 1053418780 King City Surgery Center, S.C. Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Mount Vernon, IL NPI 1003005463

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-02-21.