Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mark Demchak, ATC
Athletic Trainer in Warrenville, IL · enumerated 2013.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1043655145
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Registry record
Entity type Individual (Type 1)
Name Mark Demchak
Credential ATC
Sex Male
Practice address 27650 Ferry Rd, Warrenville, IL, 60555
Phone (630) 225-2663
Enumeration date May 2, 2013
Last updated in NPPES May 2, 2013
Taxonomy & licenses
2255A2300X Athletic Trainer Respiratory, Developmental, Rehabilitative and Restorative Service Providers · License 096003197 (IL) Primary
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.
Frequently asked questions
Is NPI 1043655145 active?
Yes, as of the latest NPPES snapshot, NPI 1043655145 is active (record last updated 2013-05-02).
How do I verify Mark Demchak's NPI record?
Cross-check NPI 1043655145 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all → 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 2013-05-02.