This research study is part of the Micro-Insurance series produced by MicroSave and the Microinsurance Centre. The paper outlines the interventions and strategies adopted by MediPlus, a privately owned, for-profit health maintenance organisation (HMO) in Nairobi. While MediPlus is not involved in the actual delivery of health services, it provides healthcare information including education packages on the maintenance and control of specific health related problems. In addition, MediPlus provides access to preventive healthcare interventions to its customers. This study maps the institutional structure of MediPlus, its health schemes’ operating mechanism, its marketing strategy, management of risk and sustainability issues related to the organisation.