Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mr. Thomas Mark
Physician Assistant in Elgin, IL · enumerated 2009.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1255577649
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Registry record
Entity type Individual (Type 1)
Name Mr. Thomas Mark
Sex Male
Practice address 370 Summit St, Elgin, IL, 60120
Phone (847) 608-1344
Enumeration date Jan 6, 2009
Last updated in NPPES Jan 6, 2009
Taxonomy & licenses
363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 085003372 (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 1255577649 active?
Yes, as of the latest NPPES snapshot, NPI 1255577649 is active (record last updated 2009-01-06).
How do I verify Thomas Mark's NPI record?
Cross-check NPI 1255577649 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 → Diana Uselding Nurse Practitioner · Elgin, IL NPI 1164415428 Mark Thompson Family Medicine Physician · Elgin, IL NPI 1316009855 Gretchen Tully Pediatrics Physician · Elgin, IL NPI 1477616290 Greater Family Health Federally Qualified Health Center (FQHC) · Elgin, IL NPI 1720142557 Amanda Ploski Family Nurse Practitioner · Elgin, IL NPI 1235287889 Oletha Johnson Nurse Practitioner · Elgin, IL NPI 1770788234 Tracy Denne Physician Assistant · Elgin, IL NPI 1780889006 Nabanita Bhowmick Adult Medicine Physician · Elgin, IL NPI 1134398506
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-01-06.