A state of being which has a beginning and an eventual end. "End" may represent resolution of an illness or death of the patient, family or other aggregate unit, e.g. population or community. Functionally, an episode of condition is a named, evolving aggregation of service_event.condition_nodes. Composition membership of condition nodes in episode of condition represents a judgment (e.g., clinical, administrative, financial) that the condition relates to one or more condition nodes. Examples include: pregancy, injuries, acute diseases, chronic diseases, risk factors, and wellness deficiencies.