OBJECTIVES: Early detection of lung cancer is important in terms of life of the patient and diminishing economic burden on patient and society. Health services for cancer patients are free in Mongolia. This study aims to determine the trend of lung cancer for the last ten years in Mongolia, direct cost of lung cancer inpatient treatment and economic loss to patient from admission in relation to the stages of lung cancer.  METHODS: To estimate trend of lung cancer time-series analysis was used. 2004-2014 data on lung cancer morbidity and mortality was obtained from the National Cancer Centre database. Direct costs of inpatient treatment of lung cancer different stages were estimated using data related to patient admission. There were reviewed 80 patients data. Economic losses from lung cancer were estimated. RESULTS: There was a trend of increasing of lung cancer incidence by 1% for ten years. Mortality from lung cancer increased by 0.99% over ten year period. Direct costs of lung cancer inpatient treatment ranged from 271-1991 USD depending on stages of lung cancer. Some 77.5% of patients admitted with lung cancer had 3^rd and 4^th stages of the disease. Average cost of economic loss from lung cancer for a patient for treatment and disability was 607680 USD.  CONCLUSIONS: Incidence of lung cancer and mortality from it are increasing over years, which means cost for the disease treatment and consequently economic loss form disability will be raising.