The 2007 DPC survey data consisted of 1,428 hospitals (16% of all hospitals), 457,000 beds (50% of all hospital beds), and four million discharges for the latter half of the year 2007. Coverage rates of population within 90 minutes of these hospitals were over 88.9% for all prefectures, with 33 out of 47 prefectures having rates over 99%. However, when the volume of services provided by each hospital was considered, population coverage showed a large disparity between prefectures and hospital services. The results also suggested the existence of a monopolistic provision of specific services in a few prefectures.