There is a growing concern regarding the overly biased patient flow toward large hospitals. The seriousness of the current situation is clearly shown by the fact that the top five causes for visitation to such full-sized hospitals include common cold, primary hypertension, and diabetes; as a result, local medical offices does little more than merely referring patients to the large hospitals. n other words, the specific functions of different kinds of medical facilities are unable to be carried out in a definitive fashion. If such trend continues to dominate the medical delivery system, the sustainability of national health insurance might be compromised. In order to prevent destabilization of the national health insurance, the rigid regulation of medical delivery system must be put into practice through reorganization of the various medical providers in terms of their functions.