Abstract-Diagnosis is an important process in patient care. A suitable diagnosis helps a physician determine a precise treatment. Physicians also have a tendency to seek collaboration from other colleagues and expert systems for better confidence in their decision. The sources of knowledge can be both human in the form of medical specialist, and artificial in the form of expert systems connected through Internet, thereby producing a network of distributed medical knowledge. A system that combines availability, cooperation and harmonization of all contributions in a diagnosis process will bring more confidence in healthcare for the physicians.Index Terms-Distributed knowledge, medical diagnosis, medical expert systems, pervasive healthcare applications, telemedicine.