Word of mouth (WOM) advertisement plays an essential role for business development. WOM helps consum-ers become familiar with new products and services, the quality of services and promotes different choices with possibly better features. This paper examines the effect of word of mouth advertisement in medical treatments in Batavia hospital in west Jakarta, Indonesia. The study examines the effects of WOM on patient’s fulfillment, satisfaction and re-admission in this hospital. The study designs a questionnaire and distrib-utes it among some patients who are waiting to receive medical care at this hospital. The survey only concentrates on patience who used the medical treatment for at least two times. Structural equation modeling is used to examine the hypotheses of this survey. The results indicate that WOM could increase the patience’s awareness and positively influence on patience’s choice for getting more treatment.