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The effect of increasing the coinsurance rate on outpatient utilization of healthcare services in South Korea

 Hyo Jung Lee  ;  Sung-In Jang  ;  Eun-Cheol Park 
Journal Title
Issue Date
Adult ; Ambulatory Care/economics ; Ambulatory Care/utilization* ; Cost Sharing/economics ; Deductibles and Coinsurance/economics* ; Drug Costs ; Female ; Health Services/economics ; Health Services/utilization* ; Hospitals ; Humans ; Insurance, Health/economics* ; Male ; Middle Aged ; Outpatients ; Prescription Drugs/economics ; Republic of Korea ; Young Adult
Healthcare utilization ; Increased coinsurance rate ; Medical costs ; Outpatient visit ; Prescription drug cost policy
BACKGROUND: The Korean healthcare system is composed of costly and inefficient structures that fail to adequately divide the functions and roles of medical care organizations. To resolve this matter, the government reformed the cost-sharing policy in November of 2011 for the management of outpatients visiting general or tertiary hospitals with comparatively mild diseases. The purpose of the present study was to examine the impact of increasing the coinsurance rate of prescription drug costs for 52 mild diseases at general or tertiary hospitals on outpatient healthcare service utilization. METHODS: The present study used health insurance claim data collected from 2010 to 2013. The study population consisted of 505,691 outpatients and was defined as those aged 20-64 years who had visited medical care organizations for the treatment of 52 diseases both before and after the program began. To examine the effect of the cost-sharing policy on outpatient healthcare service utilization (percentage of general or tertiary hospital utilization, number of outpatient visits, and outpatient medical costs), a segmented regression analysis was performed. RESULTS: After the policy to increase the coinsurance rate on prescription drug costs was implemented, the number of outpatient visits at general or tertiary hospitals decreased (β = -0.0114, p < 0.0001); however, the number increased at hospitals and clinics (β = 0.0580, p < 0.0001). Eventually, the number of outpatient visits to hospitals and clinics began to decrease after policy initiation (β = -0.0018, p < 0.0001). Outpatient medical costs decreased for both medical care organizations (general or tertiary hospitals: β = -2913.4, P < 0.0001; hospitals or clinics: β = -591.35, p < 0.0001), and this decreasing trend continued with time. CONCLUSIONS: It is not clear that decreased utilization of general or tertiary hospitals has transferred to that of clinics or hospitals due to the increased cost-sharing policy of prescription drug costs. This result indicates the cost-sharing policy, intended to change patient behaviors for healthcare service utilization, has had limited effects on rebuilding the healthcare system and the function of medical care organizations.
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1. College of Medicine (의과대학) > Dept. of Preventive Medicine and Public Health (예방의학교실) > 1. Journal Papers
Yonsei Authors
Park, Eun-Cheol(박은철) ORCID logo https://orcid.org/0000-0002-2306-5398
Jang, Sung In(장성인) ORCID logo https://orcid.org/0000-0002-0760-2878
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