Background and aims: The presence or absence of efficient performance assessment system is directly related to the organizations life or death. Because of Hospitals importance role in community health the need to assess the performance and efficiency improvement feels more than others and to assess health care units quantitative indicators were used. The proper techniques for comparing hospitals performance based on three indicators of bed occupancy rate, average length of stay, bed occupancy turnover, is “PABON LASSO” graphical models. The aim of this study was The Assessment of Performance and Efficiency of Tehran Public and Private Hospitals by Pabon Lasso Model in 2015.

Methods: This cross-sectional descriptive study was carried out in 16 public and private hospitals in Tehran in 2015.Pabon Lasso model was used and to analysis of data spss 18.0 was applied.

Results: The average of bed occupancy rate, length of stay and bed turnover rate in hospitals were respectively 58.46%, 3.84 days and 64.51 per year. In this study, three hospitals in the first region, five hospitals in the second region, two hospitals in third region and six hospitals were located in the fourth region. Just two hospitals were efficient.

Conclusion: Results of this study indicated that only two hospitals (12.5% from a total of 16 hospitals) had the desired performance. In conjunction with hospitals that are located in the first region, manager's serious act to analyzing the root causes of poor performance and corrective actions to optimize the use of limited resources is necessary.