[From chronic disease to multimorbidity: Which impact on organization of health care].

Healthcare systems are concerned with the growing prevalence of chronic diseases. Single disease approach, based on the Chronic Care Model, is known to improve specific indicators for the targeted disease. However, the co-existence of several chronic disease, or multimorbidity, within a same patient is the most frequent situation. The fragmentation of care, as consequence of the single disease approach, has negative impact on the patient and healthcare professionals. A person centred approach is a method addressing the combination of health issues of each patient. The coordination and synthesis role is key to ensure continuity of care for the patient within a network of healthcare professionals from several settings of care. This function is the main characteristic of an organized first level of care.