Wireless Body Area Network makes it possible to monitor patient’s health under critical situations by integrating bio-sensors with a mobile phone. With this WBAN has now become a emerging technology to improve patient’s quality of life by enabling health monitoring at home instead of at a hospital. WBAN reduces the workload of medical practitioners as well as healthcare costs which further results in higher efficiency. This paper presents the architecture of existing wireless health monitoring system (WBAN system). Due to limited battery capacity of sensor nodes there is need to have energy efficient design. This work explores the grid based data dissemination model for WBAN. The grid model divides the network area into cells. All the nodes will not participate in data transmission which conserves energy. Further we compare existing model with the grid model on the basis of energy consumed, throughput and delay.