Concentra® began in 1979 as OccuSystems Inc., a physician-owned practice in Amarillo, Texas. The company grew quickly, reaching nearly 200 locations in 12 states by 2000. In the same year, the company shortened its name to Concentra® and established a reputation as an expert in occupational medicine. By 2005, the company was operating 300 medical centers in 34 states. Concentra entered Illinois in the late 1990s and quickly expanded to 16 locations throughout the state. They recently transitioned all U.S. HealthWorks centers in Illinois to Concentra. This transition has added three more centers in Illinois to the company.

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