Background: The research regarding nursing diagnosis and collaboration problems were not very often conducted in Indonesia. Therefore, it is need to establish researches in standardized nursing language. Aims. The aim of this research was identified the nursing diagnosis and problem collaborations among hospitalized patients in University of Sumatera Utara Hospital, Indonesia. Method. This study is a quantitative research with cross-sectional approach. The data collection conducted through the nursing assessment with six steps of diagnostic reasoning method. The sampling technique was total sampling which involved hospitalized patients from March until May 2016; consisting 72 patients in inpatients unit which 19 pediatric patients, 36 adult patients, six maternity patients and 11 intensive care unit patients. The data analysis was frequency distribution from nursing diagnosis and problem collaborations. Result. The result revealed that there were 38 nursing diagnosis and collaborative problems found among pediatric patients, 56 nursing diagnosis and collaborative problems found among adult patients, 47 nursing diagnosis and collaborative problems found among intensive care patients and only eight nursing diagnosis found among maternity patients. The risk for infection was the most common nursing diagnosis among pediatric and maternity patients with thrombocytopenia as the most common collaborative problem found among pediatric patients. Acute pain was the first rank of nursing diagnosis found among adult patients. And, bleeding was the main problem collaboration. The risk for disuse syndrome was the most nursing diagnosis established among patients in intensive care unit, with pneumothorax as the common collaborative problem. Conclusion: It was found that the most common nursing diagnosis found among hospitalized patients was the risk for infection with various collaborative problems. Therefore, it is needs to establish infection precaution in every unit in the future. In fact, the nursing intervention regarding the infection control should be done in every unit
