LSS Data Systems (LSS), was a Minnesota-based medical software and service company that develops products for the physician practice community. LSS was founded in 1982, and since then was a partner of Medical Information Technology (MEDITECH), developing physician practice management and ambulatory electronic health record software. In 2000 and 2001 MEDITECH invested in LSS and in February 2011, acquired complete ownership. LSS became a wholly owned subsidiary of the Massachusetts based company, and announced completion of the merger on January 1, 2014.