The Reality of Cost Sharing in Japan

Financial pressure on younger generation is mounting in Japan, a super‐ageing society with staggering economy. The revision on the co‐insurance rate for 70–74 with “Standard” category was implemented to mitigate such pressure, seeking better balance across generations in sharing the burden of healthcare cost. It raised the rate from 10% to 20% over the period of five years from 2014 to 2018. This report examined how it changed the share of cost sharing (cost sharing as percentage to total healthcare expenditure), among the 70–74 with “Standard” category in Citizens Health Insurance programme in 44 prefectures. It specifically focused on change in the population's actual share of cost sharing (ASCS) that better reflect the genuine amount of payment actually made by the patients themselves. The average ASCS increased from 7.28% (2013) to 10.78% (2019), resulting wider gap from the statutory planned share of cost sharing (i.e., the statutory co‐insurance rate of 10% in 2013, and 20% in 2019). Also found was increased variance among prefectural ASCS, which may suggest a possibility of un‐designed effect by the revision, of encouraging a move towards ability and willingness to pay. In terms of cost containment effect, Japan needs to consider various non‐conventional options, including review of the current use of healthcare resources. First and foremost, however, the true state of cost sharing should be recognized in terms of ASCS and shared more widely as a reality. Such effort is essential in discussion of how to keep embracing the country's life line, UHC.