The present work was aimed at investigating whether the patients' involvement by their healthcare providers may satisfy patients' fundamental psychological needs (i.e. self-esteem, belonging, control, meaningful existence), which in turn, can impact their psychological well-being. Based on the European Quality of Life Survey data, the sample included 10,427 European adults who, in the last 12 months, visited GP/family doctors and hospital/medical specialists. Among them, 51.3% declared to have a chronic disease. Results showed that the experience of being involved by GP/family doctors and hospital/medical specialists had a positive effect on psychological well-being and that this effect was mediated by the satisfaction of all four needs. Moreover, the results of the moderated mediation model showed that the indirect effect of the involvement by GP/family doctors and hospital/medical specialists on psychological well-being through belonging was moderated by the presence or absence of a chronic condition. The study provides a novel contribution in investigating the positive effects of the patient's involvement, emphasizing its importance for patient's needs satisfaction, and its role appears particularly beneficial for the ones living with a chronic condition.