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Onsite Physician Services of Illinois, S.C.

Family Medicine Physician in Middlefield, OH · enumerated 2025 · authorized official Alan Gegenheimer, President.

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

National Provider Identifier

1801766084

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Registry record

Entity type Organization (Type 2)
Legal business name Onsite Physician Services of Illinois, S.C.
Practice address 16052 Industrial Pkwy, Middlefield, OH, 44062
Phone (815) 363-9500
Enumeration date Nov 11, 2025
Last updated in NPPES Nov 11, 2025

Taxonomy & classification

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Alan Gegenheimer
Title President
Phone (815) 363-9500

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

What is the NPI number for Onsite Physician Services of Illinois, S.C.?
The NPI for Onsite Physician Services of Illinois, S.C. is 1801766084, a Type 2 (organization) record in the CMS NPPES registry.
Who is the authorized official for Onsite Physician Services of Illinois, S.C.?
NPPES lists Alan Gegenheimer (President) as the authorized official for this organization.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-11-11.