[1] While Concentra is currently the product of a number of mergers, the original company was OccuSystems Inc., founded in Amarillo, Texas by Dr. Richard Rhem in 1979.

[2] Rehm hired a CEO, who acquired $35 million in seed money from venture capitalists Welsh, Carson, Anderson & Stowe and the Sprout Group, and the company began to buy up other clinics.

[2] The acquisition of First Notice Systems was important for the business because making sure that injuries were reported with 24 hours reduced medical costs and got workers back to work more quickly.

[2] Following a series of sale deals in 2006 and 2007, Concentra restricted its focus on occupational health, medical center growth, and wellness and preventive care.

[5] Humana made this acquisition as part of an attempt to expand into primary care practices and medical services organizations.

The lawsuit was initiated on behalf of First State Orthopedics and all U.S. physicians with workers' compensation or car accident bills that had been repriced by Concentra or its subsidiaries.

The complaint was based on allegations of "breach of contract/duty of good faith and fair dealing, tortious interference with existing and prospective contractual relations and unjust enrichment".

[citation needed] A $3.7 million settlement was reached, with Concentra agreeing to pay $2,000 to each plaintiff as well as legal expenses.

CSMS recommended that doctors who were substantially aggrieved consider opting out of the class action lawsuit to retain the option of pursuing an individual claim against the company in the future.

[14] The lawsuit was filed in Colorado federal court on behalf of 13,521 Wal-Mart employees who had received treatment for work-related injuries.