Insurance Is Compulsory and Nationality Is Not a Condition
Answer
The general rule applies to you
No exception is recorded for citizens of Ireland on this topic. That is the answer, not a gap - everything below is the rule you get, unchanged.
195 exceptions recorded across 74 countries · none match Ireland to Japan · Access to healthcare
Japan has no residence test for health insurance and no waiting period. Article 5 of the National Health Insurance Act says that a person who has an address in a prefecture is an insured person of that prefecture's National Health Insurance, and article 6 lists the people it does not cover - which turns out to be everyone already covered by something else, principally employees under the Health Insurance Act. Between them, the two leave almost nobody out. Nationality is not mentioned in either. What does the work for a foreign national is the municipal register: a person given a status of residence for more than three months is a mid-to-long-term resident, gets a residence card, has to register an address, and is therefore a person with an address in a prefecture. The patient pays three tenths of the cost at the counter.
At a glance
- Who is insured under National Health Insurance
- A person with an address in the prefecture
都道府県の区域内に住所を有する者, article 5 of the National Health Insurance Act. Nationality is not a condition and appears nowhere in the article.
- Waiting period
- None in article 5 or article 6 of the National Health Insurance Act
Article 5 makes cover follow the address. Article 6, read in full, lists eleven exclusions and none of them is a period of time since arrival.
- Enrolment
- Not optional
The Act states who is an insured person; it does not create a choice. Article 6 excludes a person covered by another scheme, which is how an employee is kept out of the municipal one.
- Threshold a foreign national has to cross
- A period of stay of more than three months
Article 19-3 of the Immigration Control and Refugee Recognition Act: a person given a period of stay of three months or less, or Temporary Visitor, Diplomat or Official status, is not a mid-to-long-term resident and gets no residence card.
- Patient's share of the cost
- Three tenths
十分の三 in article 42(1)(i) of the National Health Insurance Act, for a person from the first 1 April after their sixth birthday to the month containing their seventieth.
- Patient's share for a child under school age
- Two tenths
Article 42(1)(ii): up to the first 31 March after the sixth birthday.
- Patient's share from seventy
- Two tenths, or three tenths on a higher income
Article 42(1)(iii) and (iv). The income level that moves it is left to Cabinet Order.
- Employees
- Covered by the Health Insurance Act instead
Article 3 of the Health Insurance Act makes a person employed at a covered establishment an insured person, subject to exclusions for day labourers, short fixed terms, seasonal and temporary work.
Requirements
- An address in a Japanese municipality, registered under the Basic Resident Registration Act
- A status of residence giving a period of stay of more than three months, other than Temporary Visitor, Diplomat or Official
- Not already covered by one of the employee schemes, the seamen's scheme, a mutual aid association, the scheme for private school staff, or the scheme for people aged seventy-five and over
- For an employee: employment at a covered establishment, which brings Health Insurance Act cover instead and automatically
In detail
The threshold is immigration law, not health law
Neither health insurance Act mentions foreigners. The National Health Insurance Act insures whoever has an address in the prefecture; the Health Insurance Act insures whoever works at a covered establishment. What decides whether a foreign national has an address is the Basic Resident Registration Act, and what decides whether that Act reaches them is article 19-3 of the immigration Act, which makes a residence card depend on a period of stay longer than three months. So the answer to 'when do I get Japanese health cover' is the same as the answer to 'when do I get a residence card', and the three months is an immigration line that the health system inherits.
Article 6 is a list of other schemes, not a list of excluded people
Read on its own, article 5 looks too wide: it would insure everybody. Article 6 is what makes the system work, and every one of its eleven items takes out a person who is already covered somewhere else - employees, seamen, national and local public servants, private school staff, dependants of each of those, people aged seventy-five and over, members of an occupational insurance society - or a household receiving public assistance. Read the two together and the design is clear: everyone is insured, and the municipal scheme is the residual one.
Three tenths at the counter
Japan does not have free treatment at the point of use. The insured person pays a fraction of the cost of whatever was done, set by article 42 at three tenths for working-age adults, two tenths for children before school age and for most people over seventy, and three tenths again for an older person with a high income. The fraction is the same whether the treatment costs a thousand yen or a million, which is why the separate ceiling on monthly costs matters so much - and that ceiling was not read for this record.
What applies to you
Nothing changes for a citizen of Ireland
We have no rule recorded that treats your citizenship differently here, so the general rule above is the one that applies to you. That is an answer, not a gap.
What the law says
«第五条 都道府県の区域内に住所を有する者は、当該都道府県が当該都道府県内の市町村とともに行う国民健康保険の被保険者とする。 （適用除外） 第六条 前条 の規定にかかわらず、次の各号のいずれかに該当する者は、都道府県が当該都道府県内の市町村とともに行う国民健康保険（以下「都道府県等が行う国民健康保険」という。）の被保険者としない。 一 健康保険法（大正十一年法律第七十号） の規定による被保険者。 ただし、 同法第三条第二項 の規定による日雇特例被保険者を除く。 二 船員保険法（昭和十四年法律第七十三号） の規定による被保険者 三 国家公務員共済組合法（昭和三十三年法律第百二十八号） 又は 地方公»Our translation - not official
Article 5 A person who has an address within the area of a prefecture is an insured person of the National Health Insurance operated by that prefecture together with the municipalities within it.
Ours. One sentence, no nationality, no qualifying period, and no application: having the address is the whole of the test.
Read it at the sourceAbout this source
The Japanese government's own consolidated statute book, run by the Digital Agency. It is the only place that publishes Japanese law as it currently stands: each law page states the date the displayed text came into force, the amending instrument that produced it, and a Law RevisionID of the form <lawid>_<yyyymmdd>_<amending-id> which identifies that exact version. A page also warns 未施行あり where amendments are enacted but not yet in force. The text is Japanese and there is no English anywhere on it; each page links out to the Ministry of Justice translation where one exists, which is how the two publishers are related. Renders through Firecrawl without difficulty despite being a single-page application.
Standing: Maintains the text in force
Cannot be cited for: Japanese only. It publishes the consolidated law and not the amending acts, so an article number here is the article of the resulting law and the instrument that put it there has to be read from the header. It carries no commentary, no notification (告示) and no ministerial guidance, and a great deal of Japanese immigration practice lives in 告示 made by the Minister of Justice which this site does not hold. It must not be cited for anything the Immigration Services Agency decides administratively, and it must not be cited for English: the English on the law pages is a link, not a text.
We re-read it every 90 days. More about this source
«第六条 前条 の規定にかかわらず、次の各号のいずれかに該当する者は、都道府県が当該都道府県内の市町村とともに行う国民健康保険（以下「都道府県等が行う国民健康保険」という。）の被保険者としない。 一 健康保険法（大正十一年法律第七十号） の規定による被保険者。»Our translation - not official
Article 6 Notwithstanding the preceding article, a person falling under any of the following items is not an insured person of the National Health Insurance operated by a prefecture together with the municipalities within it: (i) an insured person under the Health Insurance Act (Act No. 70 of 1922).
Ours, and the opening with the first item. The article runs to eleven items and every one of them is a person covered by another scheme or in receipt of public assistance. None of them is about nationality, status of residence or length of stay.
Read it at the sourceAbout this source
The Japanese government's own consolidated statute book, run by the Digital Agency. It is the only place that publishes Japanese law as it currently stands: each law page states the date the displayed text came into force, the amending instrument that produced it, and a Law RevisionID of the form <lawid>_<yyyymmdd>_<amending-id> which identifies that exact version. A page also warns 未施行あり where amendments are enacted but not yet in force. The text is Japanese and there is no English anywhere on it; each page links out to the Ministry of Justice translation where one exists, which is how the two publishers are related. Renders through Firecrawl without difficulty despite being a single-page application.
Standing: Maintains the text in force
Cannot be cited for: Japanese only. It publishes the consolidated law and not the amending acts, so an article number here is the article of the resulting law and the instrument that put it there has to be read from the header. It carries no commentary, no notification (告示) and no ministerial guidance, and a great deal of Japanese immigration practice lives in 告示 made by the Minister of Justice which this site does not hold. It must not be cited for anything the Immigration Services Agency decides administratively, and it must not be cited for English: the English on the law pages is a link, not a text.
We re-read it every 90 days. More about this source
«一 六歳に達する日以後の最初の三月三十一日の翌日以後であつて七十歳に達する日の属する月以前である場合 十分の三 二 六歳に達する日以後の最初の三月三十一日以前である場合 十分の二 三 七十歳に達する日の属する月の翌月以後である場合（ 次号 に掲げる場合を除く。） 十分の二 四 七十歳に達する日の属する月の翌月以後である場合であつて、当該療養の給付を受ける者の属する世帯に属する被保険者（七十歳に達する日の属する月の翌月以後である場合に該当する者その他政令で定める者に限る。）について政令の定めるところにより算定した所得の額が政令で定める額以上であるとき 十分の三 ２ 保険医療機関等は、 前項 の一»Our translation - not official
(i) In the case of a period from the day after the first 31 March following the day the person reaches six years of age, up to and including the month containing the day the person reaches seventy: three tenths. (ii) In the case of a period up to and including the first 31 March following the day the person reaches six years of age: two tenths.
Ours. The co-payment is a fraction of the cost of the treatment, not a flat fee, and the age bands are measured from a school year rather than from a birthday.
Read it at the sourceAbout this source
The Japanese government's own consolidated statute book, run by the Digital Agency. It is the only place that publishes Japanese law as it currently stands: each law page states the date the displayed text came into force, the amending instrument that produced it, and a Law RevisionID of the form <lawid>_<yyyymmdd>_<amending-id> which identifies that exact version. A page also warns 未施行あり where amendments are enacted but not yet in force. The text is Japanese and there is no English anywhere on it; each page links out to the Ministry of Justice translation where one exists, which is how the two publishers are related. Renders through Firecrawl without difficulty despite being a single-page application.
Standing: Maintains the text in force
Cannot be cited for: Japanese only. It publishes the consolidated law and not the amending acts, so an article number here is the article of the resulting law and the instrument that put it there has to be read from the header. It carries no commentary, no notification (告示) and no ministerial guidance, and a great deal of Japanese immigration practice lives in 告示 made by the Minister of Justice which this site does not hold. It must not be cited for anything the Immigration Services Agency decides administratively, and it must not be cited for English: the English on the law pages is a link, not a text.
We re-read it every 90 days. More about this source
«第三条 この法律において「被保険者」とは、適用事業所に使用される者及び任意継続被保険者をいう。 ただし、次の各号のいずれかに該当する者は、日雇特例被保険者となる場合を除き、被保険者となることができない。 一 船員保険の被保険者（ 船員保険法（昭和十四年法律第七十三号）第二条第二項 に規定する疾病任意継続被保険者を除く。） 二 臨時に使用される者であって、次に掲げるもの（イに掲げる者にあっては一月を超え、ロに掲げる者にあってはロに掲げる定めた期間を超え、引き続き使用されるに至った場合を除く。） イ 日々雇い入れられる者 ロ 二月以内の期間を定めて使用される者であって、当該定めた期間を超えて使用さ»Our translation - not official
Article 3 In this Act, 'insured person' means a person employed at a covered establishment and a voluntarily continuing insured person.
Ours. Employment at a covered establishment is itself the cover; nothing has to be applied for, and article 6 of the National Health Insurance Act then keeps the same person out of the municipal scheme.
Read it at the sourceAbout this source
The Japanese government's own consolidated statute book, run by the Digital Agency. It is the only place that publishes Japanese law as it currently stands: each law page states the date the displayed text came into force, the amending instrument that produced it, and a Law RevisionID of the form <lawid>_<yyyymmdd>_<amending-id> which identifies that exact version. A page also warns 未施行あり where amendments are enacted but not yet in force. The text is Japanese and there is no English anywhere on it; each page links out to the Ministry of Justice translation where one exists, which is how the two publishers are related. Renders through Firecrawl without difficulty despite being a single-page application.
Standing: Maintains the text in force
Cannot be cited for: Japanese only. It publishes the consolidated law and not the amending acts, so an article number here is the article of the resulting law and the instrument that put it there has to be read from the header. It carries no commentary, no notification (告示) and no ministerial guidance, and a great deal of Japanese immigration practice lives in 告示 made by the Minister of Justice which this site does not hold. It must not be cited for anything the Immigration Services Agency decides administratively, and it must not be cited for English: the English on the law pages is a link, not a text.
We re-read it every 90 days. More about this source
«第十九条の三 出入国在留管理庁長官は、本邦に在留資格をもつて在留する外国人のうち、次に掲げる者以外の者（以下「中長期在留者」という。）に対し、在留カードを交付するものとする。 一 三月以下の在留期間が決定された者 二 短期滞在の在留資格が決定された者 三 外交又は公用の在留資格が決定された者 四 前三号 に準ずる者として法務省令で定めるもの»Our translation - not official
Article 19-3 The Commissioner of the Immigration Services Agency is to issue a residence card to a foreign national residing in Japan with a status of residence, other than the following (hereinafter 'mid-to-long-term resident'): (i) a person for whom a period of stay of three months or less has been decided; (ii) a person for whom the Temporary Visitor status of residence has been decided; (iii) a person for whom the Diplomat or Official status of residence has been decided; (iv) a person specified by Ministry of Justice Order as equivalent to the preceding three items.
Ours. The three-month line that everything else hangs on, and it is drawn in the immigration Act rather than in either health insurance Act.
Read it at the sourceAbout this source
The Japanese government's own consolidated statute book, run by the Digital Agency. It is the only place that publishes Japanese law as it currently stands: each law page states the date the displayed text came into force, the amending instrument that produced it, and a Law RevisionID of the form <lawid>_<yyyymmdd>_<amending-id> which identifies that exact version. A page also warns 未施行あり where amendments are enacted but not yet in force. The text is Japanese and there is no English anywhere on it; each page links out to the Ministry of Justice translation where one exists, which is how the two publishers are related. Renders through Firecrawl without difficulty despite being a single-page application.
Standing: Maintains the text in force
Cannot be cited for: Japanese only. It publishes the consolidated law and not the amending acts, so an article number here is the article of the resulting law and the instrument that put it there has to be read from the header. It carries no commentary, no notification (告示) and no ministerial guidance, and a great deal of Japanese immigration practice lives in 告示 made by the Minister of Justice which this site does not hold. It must not be cited for anything the Immigration Services Agency decides administratively, and it must not be cited for English: the English on the law pages is a link, not a text.
We re-read it every 90 days. More about this source
«第三十条の四十五 日本の国籍を有しない者のうち次の表の上欄に掲げるものであつて市町村の区域内に住所を有するもの（以下「外国人住民」という。）に係る住民票には、 第七条 の規定にかかわらず、 同条各号（ 第一号の二、 第五号、 第六号 及び 第九号 を除く。）に掲げる事項、国籍等（国籍の属する国又は 出入国管理及び難民認定法（昭和二十六年政令第三百十九号。以下この章において「入管法」という。）第二条第五号 ロに規定する地域をいう。以下同じ。）、外国人住民となつた年月日（外国人住民が同表の上欄に掲げる者となつた年月日又は住民となつた年月日のうち、いずれか遅い年月日をいう。以下同じ。）及び同表の上欄»Our translation - not official
Article 30-45 On the residence record of a person without Japanese nationality who is listed in the left-hand column of the following table and who has an address within the area of a municipality (hereinafter 'foreign resident') ...
Ours. This is the bridge: a mid-to-long-term resident is entered on the municipal register, and being on it is what makes a person someone with an address in a prefecture for article 5 of the National Health Insurance Act.
Read it at the sourceAbout this source
The Japanese government's own consolidated statute book, run by the Digital Agency. It is the only place that publishes Japanese law as it currently stands: each law page states the date the displayed text came into force, the amending instrument that produced it, and a Law RevisionID of the form <lawid>_<yyyymmdd>_<amending-id> which identifies that exact version. A page also warns 未施行あり where amendments are enacted but not yet in force. The text is Japanese and there is no English anywhere on it; each page links out to the Ministry of Justice translation where one exists, which is how the two publishers are related. Renders through Firecrawl without difficulty despite being a single-page application.
Standing: Maintains the text in force
Cannot be cited for: Japanese only. It publishes the consolidated law and not the amending acts, so an article number here is the article of the resulting law and the instrument that put it there has to be read from the header. It carries no commentary, no notification (告示) and no ministerial guidance, and a great deal of Japanese immigration practice lives in 告示 made by the Minister of Justice which this site does not hold. It must not be cited for anything the Immigration Services Agency decides administratively, and it must not be cited for English: the English on the law pages is a link, not a text.
We re-read it every 90 days. More about this source
Practical notes
Articles 5 and 6 of the National Health Insurance Act were read in full, which is what bounds the statement that there is no nationality condition and no waiting period in them.
The high-cost medical expense benefit, which caps what a patient actually pays in a month, is a separate provision of both Acts and was not read.
Premiums are not recorded here. National Health Insurance premiums are set by each municipality within a statutory frame, so there is no national figure, and the Health Insurance Act premium rate is set by the insurer.
Dependants of an employee are covered under the Health Insurance Act's 被扶養者 provisions, which were not read. Since 2020 those provisions have carried a residence-in-Japan condition which this record does not describe because the provision was not read.
No English translation was used. The Ministry of Justice's translation database has no current translation of either health insurance Act.
- consolidates国民健康保険法 - e-Gov 法令検索
e-Gov 法令検索 (e-Gov Law Search) · consolidated to 2026-10-01
About this source
The Japanese government's own consolidated statute book, run by the Digital Agency. It is the only place that publishes Japanese law as it currently stands: each law page states the date the displayed text came into force, the amending instrument that produced it, and a Law RevisionID of the form <lawid>_<yyyymmdd>_<amending-id> which identifies that exact version. A page also warns 未施行あり where amendments are enacted but not yet in force. The text is Japanese and there is no English anywhere on it; each page links out to the Ministry of Justice translation where one exists, which is how the two publishers are related. Renders through Firecrawl without difficulty despite being a single-page application.
Standing: Maintains the text in force
Cannot be cited for: Japanese only. It publishes the consolidated law and not the amending acts, so an article number here is the article of the resulting law and the instrument that put it there has to be read from the header. It carries no commentary, no notification (告示) and no ministerial guidance, and a great deal of Japanese immigration practice lives in 告示 made by the Minister of Justice which this site does not hold. It must not be cited for anything the Immigration Services Agency decides administratively, and it must not be cited for English: the English on the law pages is a link, not a text.
We re-read it every 90 days. More about this source
- consolidates健康保険法 - e-Gov 法令検索
e-Gov 法令検索 (e-Gov Law Search) · consolidated to 2026-10-01
About this source
The Japanese government's own consolidated statute book, run by the Digital Agency. It is the only place that publishes Japanese law as it currently stands: each law page states the date the displayed text came into force, the amending instrument that produced it, and a Law RevisionID of the form <lawid>_<yyyymmdd>_<amending-id> which identifies that exact version. A page also warns 未施行あり where amendments are enacted but not yet in force. The text is Japanese and there is no English anywhere on it; each page links out to the Ministry of Justice translation where one exists, which is how the two publishers are related. Renders through Firecrawl without difficulty despite being a single-page application.
Standing: Maintains the text in force
Cannot be cited for: Japanese only. It publishes the consolidated law and not the amending acts, so an article number here is the article of the resulting law and the instrument that put it there has to be read from the header. It carries no commentary, no notification (告示) and no ministerial guidance, and a great deal of Japanese immigration practice lives in 告示 made by the Minister of Justice which this site does not hold. It must not be cited for anything the Immigration Services Agency decides administratively, and it must not be cited for English: the English on the law pages is a link, not a text.
We re-read it every 90 days. More about this source
- consolidates住民基本台帳法 - e-Gov 法令検索
e-Gov 法令検索 (e-Gov Law Search) · consolidated to 2026-10-01
About this source
The Japanese government's own consolidated statute book, run by the Digital Agency. It is the only place that publishes Japanese law as it currently stands: each law page states the date the displayed text came into force, the amending instrument that produced it, and a Law RevisionID of the form <lawid>_<yyyymmdd>_<amending-id> which identifies that exact version. A page also warns 未施行あり where amendments are enacted but not yet in force. The text is Japanese and there is no English anywhere on it; each page links out to the Ministry of Justice translation where one exists, which is how the two publishers are related. Renders through Firecrawl without difficulty despite being a single-page application.
Standing: Maintains the text in force
Cannot be cited for: Japanese only. It publishes the consolidated law and not the amending acts, so an article number here is the article of the resulting law and the instrument that put it there has to be read from the header. It carries no commentary, no notification (告示) and no ministerial guidance, and a great deal of Japanese immigration practice lives in 告示 made by the Minister of Justice which this site does not hold. It must not be cited for anything the Immigration Services Agency decides administratively, and it must not be cited for English: the English on the law pages is a link, not a text.
We re-read it every 90 days. More about this source