Our History
Four Decades of Putting Workers First
From a single onsite clinic in 1984 to a nationwide leader in occupational health, Medcor has spent more than 40 years developing smarter ways to care for workers. Here are some of the milestones that got us here.
1984
Medcor is founded in Illinois by Philip Seeger and Bennet Petersen.
Adapting procedures from prehospital emergency medicine, they staff and operate onsite clinics at large worksites and public venues. The first onsite clinic opens full-time.
1985
Medcor expands outside Illinois.
The first version of Medfiles, Medcor’s proprietary electronic medical record software, debuts.
1989
Medcor’s corporate headquarters are built in McHenry, Illinois.
1994
Medcor celebrates 10 years in business.
1997
Medcor’s 24/7 injury and illness triage service launches.
Developed in response to client demand for care support at worksites too small to justify an onsite clinic, including individual grocery stores and restaurants.
1998
Medcor establishes its first full-time physician-based clinic.
1999
Medcor begins offering safety services, providing practical onsite safety assistance to worksites across North America.
2000
Medcor opens its first clinics on construction sites, officially launching the Construction Health and Safety line of business.
2001
Medcor provides onsite services in support of recovery after 9/11.
Remaining onsite for years afterward and supporting new construction that followed.
Medcor launches AFKAM®.
Proprietary software that supports and automates telephonic injury triage and is now in its second generation as AFKAM II.
2002
Medcor launches employee screening services to manage drug and alcohol testing for employers.
2003
Special operations clinics at Yellowstone National Park open.
2004
Medcor’s dedicated data center goes online.
2009
Medcor celebrates 25 years in business.
2010
Medcor receives U.S. Patents 7,716,070; 7,720,692; and 7,688,733 for injury triage.
2011
The Itasca, Illinois, call center opens.
2012
Medcor’s injury triage line takes its one millionth call.
2013
Medcor receives U.S. Patent 8,346,573 for injury triage.
2014
Medcor’s Cebu branch office opens in the Philippines.
2016
Medcor Canada launches.
2017
Medcor launches direct-response mobile clinics to reach remote areas and support special operations needs.
2020
Medcor’s health security service line expands in response to the COVID‑19 pandemic.
2023
Medcor Safety launches, encompassing all onsite and virtual worksite safety services.
2024
Medcor celebrates 40 years in business.
2025
Medcor opens 34 permanent clinics.
Bringing its total to 232 locations across 37 states. Medcor Canada expands into Quebec and achieves 100% client retention. Medcor launches QAi, an artificial intelligence initiative developed in collaboration with Amazon Web Services to strengthen triage quality assurance and clinical documentation.
2026
Medcor enters an agreement to join the APM Group.
An international health and human services organization operating in 11 countries, to expand access to independent, advocacy-based occupational healthcare across North America.
Your Workforce Keeps Changing. Your Care Partner Should Too.
Medcor has spent over four decades adapting to what employers need next. Today, we help organizations across North America keep workers healthy, productive and on the job with onsite, virtual and occupational health programs built around their people.