The current Japanese healthcare system can be best understood by reviewing its origins. The public health insurance program in Japan is a combination of three separately developed structures—the employment-based health insurance system, the residence-based National Health Insurance system, and the medical insurance system for those aged 75 and over. Today, these three structures combined form the basis of one of the largest healthcare insurance programs in the world, covering nearly all Japanese citizens and long-term residents, over 127 million people. In light of historical circumstances and following numerous revisions to the Health Insurance Act since its introduction in 1922, these insurance systems are administered by a variety of insurers.
1.2 The history of public healthcare insurance
Employment-based health insurance—Securing Japan’s military and labor force
Prior to the 1920s, health and life insurance was available in Japan through private mutual aid associations (minkan kyosai kumiai) for private sector workers, and through public mutual aid associations (kangyo kyosai kumiai) for workers in the public sector. Employers and workers contributed to these associations on a voluntary basis. Benefits and contribution rates varied among plans. This system transitioned to the current government-regulated employment-based health insurance system in 1927, following the passage of the Health Insurance Act of 1922, which mandated that health insurance be offered to employees of any firm with ten or more employees through corporate health insurance associations (kenko hoken kumiai). Similar to other parts of the health insurance system, these associations offered beneficiaries government-dictated benefits and rates. Despite its precarious start and initial financial instability, the program gained momentum as military labor needs increased. In 1934, the program was further expanded to include firms with at least five or more employees. That program evolved into the two employer-based health insurance schemes that exist today—one for the public sector and employees of large companies (which employ over 700 people) offered by health insurance associations or cooperative associations, and one for employees of small- to medium-sized companies, offered by the Japan Health Insurance Association.
Residence-based health insurance was delivered prior to the twentieth century through the Jyorei system. The residence-based National Health Insurance (NHI) system, in its current form, was established after the passage of the National Health Insurance Act of 1938, the same year that the Ministry of Health and Welfare (now known as MHLW) was established. The implementation of residence-based health insurance was complicated by World War II. In addition, NHI was not initially successful in covering the entire Japanese population because municipalities, although charged with the local administration of NHI, were not mandated to establish local programs. As a result, a 1956 study found that approximately one-third of the population of Japan remained uninsured. To address this problem, an amendment to the National Health Insurance Act was passed in 1958 mandating that all municipalities establish and administer residence-based NHI programs at the local level. This amendment led to full coverage of the entire population by 1961. At that time, NHI covered 50% of healthcare costs, and in 1968, the NHI benefit was further increased to cover 70%. The NHI cost-sharing scheme has been adjusted over time. See Health Insurance System for more information.
In 1973, Japan forged a unique health insurance structure for its older population, reallocating public funds to subsidize the 30% of costs typically covered by patients within the NHI cost-sharing scheme and effectively making healthcare free for people aged 70 and over. Japan simultaneously introduced a high-cost medical care benefit system which at first covered only family members of employees via the employment-based health insurance, not extending to employees themselves. Later, employees along with their families came to enjoy the benefits of this system via National Health Insurance, when employment-based health insurance finally grew to also cover employees. Between 1973 and 1980, healthcare spending for people aged 70 and over increased more than fourfold, leading to sustainability concerns and the eventual passage of the 1982 Public Aid for the Aged Act. This act, implemented in 1983, put an end to free healthcare for the elderly by requiring that they pay small copayments.12 In addition, this legislation helped to subsidize the NHI program by transferring revenue from employment-based health insurance to NHI. As a result, the Public Aid for the Aged Act is considered one of the most critical pieces of healthcare legislation in the history of Japanese health policy.
The Public Aid for the Aged Act of 1982 created the basis for the Health Services Scheme for the Aged. This scheme, which was administered by municipalities, covers people aged 75 and over as well as those bedridden aged 65 and over (People aged 70 or over born prior to September 30, 1932, were covered by the Health Services Scheme for the Aged). Funding for the scheme was provided by contributions from medical insurers, public funds, and partial contributions by the insured. This scheme was in place for nearly 25 years, only being revised in 2008. There were many reasons for the revision. Chief among them was the lack of transparency regarding distribution of medical expense burden between the young and the old. Through the scheme, a part of every premium contributed by the members of any health insurance plan was transferred to municipal governments. In other words, the groups collecting premiums (insurance schemes) were not the same as the groups paying contributions (municipalities), making it difficult to know how contributions were actually spent. This scheme was finally discontinued in April 2008 alongside the creation of the Medical Insurance System for the Latter-Stage Elderly targeting people aged 75 and over. The cost-sharing details between the young and the old are much more transparent in this system. Furthermore, this system established governmental unions in prefectural associations across the country to act as central locations for the collection and payment of insurance premiums. This system also has clearly defined regulations regarding the responsibilities of management and the use of public finances.
In addition to the previously mentioned systems, in 1984, the Government created the Retired Persons Healthcare System to relieve the building pressure on public finances brought on by increasing numbers of retirees leaving employment-based insurance schemes and coming under the coverage of NHI. The Retired Persons Healthcare System covered people aged 65 and under who were enrolled in NHI, people on employee pensions for over twenty years, and people who elected to receive retirement pensions after the age of forty and had done so for 10 years or more. Dependents were also covered by this system if they satisfied a fixed set of accreditation criteria. This system was administered by municipal governments, and funding was sourced from premiums contributed by system members, as well as premiums paid to employment-based health insurance plans. The Retired Persons Healthcare System itself was discontinued following the establishment of the Medical Insurance System for the Latter-Stage Elderly in April 2008.
The 2006 reform of the Japanese medical system is tremendously important when trying to understand health policy in Japan. This reform created a new healthcare system for people aged 75 and over. A number of reasons led to the creation of this new system. The first was related to Japan’s residence-based insurance, a part of NHI that covers people residing in Japan who are not enrolled in employment-based health insurance plans. The health insurance system was set up such that when people retired who had formerly been enrolled in employment-based health insurance plans, they would then be enrolled in Community Health Care Plans. Since people generally retire at older ages, the average age of the population enrolled in NHI (via these plans) grew older and older as time passed. This shift placed enormous financial pressure on the NHI since older people tend to incur greater medical expenses. The 2006 reform aimed to respond to this structural challenge by establishing a framework that allowed people aged 75 and over to be supported by society as a whole. Specifically, a new system was set up requiring people aged 75 and over to cover 10% of their medical expenses, while the remaining 90% is covered by the working population and public funds. A framework was also created by insurers to adjust costs for people aged 65 to 74 by having them enroll in either Community Health Care Plans or employment-based health insurance. The framework for those aged 75 and over came to be known as the Medical Insurance System for the Latter-Stage Elderly, while the framework for those aged 65 to 74 supports people considered to be “Early-stage” elderly.
Prior to the establishment of the Long-Term Care Insurance System, welfare and medical care for the elderly were delivered via separate systems. In terms of welfare, municipal governments selected the types of services people were eligible for as well as the institutions from which they could receive the services. Service recipients had no say in these matters. Service fees were decided according to the incomes of recipients and the incomes of their dependents, leading to heavy burdens for middle-class households. As for medical care for people aged 75 and over, a lack of infrastructure for welfare services limited society’s ability to provide long-term care to people in need of services, including daily care in hospitals and care related to specific medical treatments which required longer periods of hospitalization.
As the Japanese population has aged, the focus of the healthcare field has shifted from acute illnesses toward the provision of integrated and continuous medical and nursing care for those with chronic conditions. Fewer and fewer families are now living with their elderly relatives compared to in the past, and the average age of family members providing care to elderly relatives is increasing. The combined effect was an increase in the number of people with no option for medical care but a long-term hospital stay, which put a strain on public finances. The
Long-Term Care Insurance Act of 1997 was created to address this issue. This act established the Long-Term Care Insurance System, which covers all people aged 65 and over, as well as people aged 40 and over who are in need of long-term care. This system gives users the freedom to select the type of services they need, as well as their service providers. This act also created the position of “Care Managers” who are able to assist users in selecting care providers. Users are charged 10% of the medical fees for the services they select, irrespective of their income (although above a certain level of income, they are charged 20%). The system differs from NHI by mandating a “maximum amount of financial support.” After a certain level of support, users must cover the costs of all excess services.
Implemented in 1948, the seminal Medical Care Act defined criteria for the basic medical services to be provided by public hospitals. The Medical Care Act has since undergone eight revisions in order to better align the provision of medical facilities with community needs as well as to introduce the system of Medical Care Plans.
A more recent piece of major health policy legislation is the Health Care System Reform Act of 2015, which changed the shape of the healthcare insurance system. This act, which will go into effect in 2018, moves oversight of the residence-based NHI from the municipal level to the prefectural level. To support the transition, this act provides prefectures with increased authority and responsibility related to financing and healthcare delivery systems. As one MHLW official put it, it is “the biggest change to healthcare in Japan since the establishment of the modern healthcare system.”
 Ikegami Naoki (2017). Medical care in Japan; Its history and organization – Direction of future reforms. Nikkei Book Publishing Company.
 Sugita Y. The 1922 Japanese Health Insurance Act. Harvard Asia Quarterly 2012; 14: 36-43.
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 Ikegami Naoki (2017). Medical care in Japan; Its history and organization – Direction of future reforms. Nikkei Book Publishing Company.
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