Objective: Inpatient cost of psychiatric disorders in Turkey is unknown. The aim of this study is to calculate the annual cost of inpatient population in a Psychiatric clinic of a university hospital in Turkey. Methods: The authors analyzed the data of psychiatric patients treated in the inpatient psychiatric clinic of the Dokuz Eylül University Hospital between January 2007 and December 2007. Retrospective chart review was performed to obtain sociodemographic and clinical data. The average annual inpatient treatment cost was calculated by multiplying the mean number of hospitalization by the average inpatient expenditure, and comparisons were made among 3 different diagnostic groups: psychotic disorders, mood disorders and other psychiatric disorders. Results: 291 inpatients were included in the study. The mean age of the patients was 39.9±15 years, the mean number of hospitalization was 1.04±0.2, the mean duration of hospitalization was 34.02±19.38 days and 53% of the patients were female. The average inpatient treatment cost of an individual patient was 1340.45±989.98 Turkish Liras (1029.69 US Dollars), and the cost of inpatient hospitalization per day was 40.81±21.67 Turkish Liras (31.35 US Dollars). The total inpatient costs were higher in psychotic disorders and mood disorders than in other psychiatric disorders. Conclusion: The annual inpatient treatment cost of psychiatric patients in Turkey is found to be lower than those in developed countries. There is insufficient data on the cost of psychiatric disorders in our country, and such information is important for planning mental health policy. (Archives of Neuropsychiatry 2010; 47: 144-9) Key words: Cost, psychiatric disorders, inpatient ÖZET Amaç: Türkiye'de psikiyatrik hastal›klar›n yatarak tedavi maliyeti bilinmemektedir. Bu çal›flman›n amac› bir üniversite hastanesinin psikiyatri klini¤inde yatan hastalar›n bir y›ll›k tedavi maliyetini araflt›rmakt›r. Yöntemler: Ocak 2007-Aral›k 2007 tarihleri aras›nda Dokuz Eylül Üniversitesi Psikiyatri Servisinde yatarak tedavi gören hastalar›n verileri incelendi. Hastala-r›n sosyo-demografik ve klinik verilerine ulaflmak için geriye dönük olarak hasta dosyalar› tarand›. Y›ll›k ortalama yatan hasta maliyeti, yatarak tedavi görmenin ortalama maliyeti ile y›ll›k ortalama yat›fl say›s› çarp›larak hesapland› ve üç grubun (Psikotik bozukluklar, duygudurum bozukluklar› ve di¤er bozukluklar) karfl›laflt›rmas› yap›ld›. Bulgular: Çal›flmaya 291 hasta dahil edildi. Hastalar›n ortalama yafl› 39.9±15 y›l, ortalama yat›fl say›s› 1.04±0.2, ortalama yat›fl süresi 34.02±19.38 gündü ve has-talar›n %53'ü kad›nd›. Bir hasta için ortalama yat›fl maliyeti 1340.45±989.98 Türk Liras› (1029.69 ABD Dolar›), ve günlük yat›fl maliyeti ise 40.81±21.67 Türk Liras› (31.35 ABD Dolar›) bulundu. Psikotik bozukluklar ve duygudurum bozukluklar›n›n yatarak tedavi maliyetleri ve di¤er psikiyatrik bozukluklardan yüksekti. Sonuç: Türkiye'de psikiyatri hastalar›n›n ortalama y›ll›k yat›fl maliyetleri geliflmifl ülkelerle k›yasland›¤›nda daha düflüktür. Ülke...