The company incurred a 154.7 million rupee loss for the year ended March, 2007 compared with a profit of 6.8 million rupees the year before.
Its staff and operating costs increased while turnover remained flat at 1.811 billion rupees during the year.
Staff costs increased to 629.8 million rupees from 577.3 million rupees.
Operating expenses had also increased to 431.9 million rupees from 369.7 million, during the same period.
Around 77 percent of the hospital's shares are held by Sri Lanka Insurance Corporation, owned by tycoon Harry Jayawardene.
Lanka Hospitals' total assets in 2007 were 2.949 billion rupees.
The hospital's share traded 75 cents lower at 21.50 rupees on Wednesday.