Understanding the contribution of knowledge to business performance is important for efficient resource allocations. It is very true for healthcare organizations. For the best utilization of scare medical expertise in the successful medical service delivery process, knowledge management will play a more important role in the future. In this paper, a performance-oriented knowledge management methodology or KP3 methodology was applied to the medical domain. Through actual data from the six OB/GYN specialty hospitals in Korea, the contribution of knowledge to performance was assessed. Specifically, the productivities of knowledge entities were calculated using DEA (Data Envelopment Analysis) approach to give some important managerial insights for knowledge management activities.