This work describes the development of ontology in the domain of Electronic Medical Records (EMRs).The purpose is to apply the semantic web as an integrating tool for information and knowledge management in clinical histories, supported by the design of an ontology of the medical domain in a telemedicine environment.The final result is the design of an ontology in the medical domain that allows the management of patient records in Spanish language.In addition, the ontology is complemented by the implementation of a semantic web service that facilitates the interrogation, maintenance and consultation of the ontology.