Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Gregory P Witkowski, MD

Orthopaedic Surgery Physician in Warrenville, IL · enumerated 2007.

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

National Provider Identifier

1750598850

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Registry record

Entity type Individual (Type 1)

Name Gregory P Witkowski

Credential MD

Sex Male

Practice address 27650 Ferry Rd, Suite 100, Warrenville, IL, 60555

Phone (630) 225-2663

Fax (630) 225-2399

Enumeration date May 17, 2007

Last updated in NPPES Feb 19, 2018

Taxonomy & licenses

207XX0004X Orthopaedic Foot and Ankle Surgery Physician Allopathic & Osteopathic Physicians · License 036-123834 (IL) Secondary

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License 036123834 (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
206147133	Other	IL	MEDICARE INDIVIDUAL
P01179010	Other	IL	RR MEDICARE
036123834	Medicaid	IL	-
206147	Other	IL	MEDICARE GROUP

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 Gregory Witkowski's NPI record?

Cross-check NPI 1750598850 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1750598850 active?

Yes, as of the latest NPPES snapshot, NPI 1750598850 is active (record last updated 2018-02-19).

Other providers at this practice address

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Brian Babka Sports Medicine (Family Medicine) Physician · Warrenville, IL NPI 1881688638 David Watt Orthopaedic Surgery Physician · Warrenville, IL NPI 1689663874 Mary Ling Orthopaedic Hand Surgery Physician · Warrenville, IL NPI 1891784005 Matthew Gimre Sports Medicine (Family Medicine) Physician · Warrenville, IL NPI 1154310365 Richard Thomas Orthopaedic Hand Surgery Physician · Warrenville, IL NPI 1366431561 Rachel Cisko Podiatrist · Warrenville, IL NPI 1235128448 Lenard Labelle Orthopaedic Surgery Physician · Warrenville, IL NPI 1679562870 Mary Norek Physical Medicine & Rehabilitation Physician · Warrenville, IL NPI 1295724490

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-02-19.