Health insurance in Japan — National Health Insurance, enrolment timing and the patient share
Japan compels foreign residents into its national system rather than excluding them from it. The traps are not about eligibility — they are a fortnight-long registration window and a patient share people underestimate.
Free · 45 minutes · With Robert or Nicole
Not ready to book? Read what thirty per cent means
What Japan requires
In, quickly, and paying a share.
Three facts, and the third is the one that decides whether you need anything on top.
Stay past three months and enrolment is compulsory
Foreign residents staying longer than three months are generally required to join National Health Insurance. It is not an option to weigh — it is a condition of living there.
And the window is measured in days
Application is required within fourteen days of becoming eligible — Osaka's official guide, verified 2026-08-01. Municipal offices administer it, and late registration brings premiums charged retroactively for up to two years, with no benefits for the period you were unenrolled. The cost of forgetting is not zero; it is backdated.
You pay 30% of what you use
Enrolment does not mean free. The patient share is roughly thirty per cent, which is modest on ordinary care and is not modest on a serious episode.
Which makes Japan the mirror image of Singapore: both excellent, one compels foreign residents in and the other keeps them out.
The fortnights, dated
A system that runs on fourteen-day windows.
Five moments in the Japanese year, verified against Osaka City's official English guide and the MHLW (2026-08-01). ⚑ marks the one number we deliberately do not print: your premium, which only your municipality can state.
Before departure · which system, decided by your job
A Japanese employer enrols you in employees' health insurance through payroll. Self-employed, a student, a dependant, between jobs? You join municipal NHI yourself. Seconded from a social-security-agreement country — Switzerland included — obtain the certificate of coverage before flying; it is the difference between exempt and enrolled.
Arrival week · one visit, two registrations
When you register your address at the municipal office, handle NHI at the same visit if employee insurance does not cover you — the requirement is application within fourteen days of becoming eligible. Bring passport, residence card and, if you have one, your My Number document.
First weeks · covered before the card
If you need care between application and the certificate arriving, you may pay in full and claim back the insured portion afterwards. Keep every itemised receipt — municipalities reimburse against documentation, not estimates.
First year · the premium step-up
⚑ Premiums are set by your municipality from last year's income — no generic figure is honest, which is why we do not print one. New arrivals with no Japanese income history often pay little in year one, then substantially more from year two. Budget for the step-up rather than assuming year one is typical.
Any change · fourteen days, again
Moving city, changing visa status, joining an employer's scheme, leaving Japan — all require paperwork within fourteen days, and the NHI certificate goes back when coverage ends. Skipping this can leave you double-billed or retroactively liable, since premiums charge backwards for up to two years.
What thirty per cent actually means
The share is fixed. The exposure is not.
Thirty per cent of a clinic visit is pocket money. Thirty per cent of a long admission, a complex operation or a course of cancer treatment is not, and it is the same thirty per cent.
That is the whole of the private-cover argument in Japan, and it is unusually narrow. You are not buying access — you already have it, and it is good. You are capping your share of the worst outcome.
Which means the right policy here is usually smaller and cheaper than the one people arrive intending to buy, because they are pricing against a system they have not yet understood.
The other thing worth covering is treatment outside Japan, since the national scheme is built around residence there. For somebody who travels often, that is the second half of a very short list.
| Item | NHI position | Your share / the note |
|---|---|---|
| Doctor visits, hospital, prescriptions | Covered nationwide, free choice of clinic | 30% share working-age; 20% pre-school; 20–30% at 70–74 |
| A large monthly bill | High-Cost Medical Expense cap | income-based monthly ceiling; the excess is refunded or waived |
| Hospital meals, private rooms | Outside the 70% coverage | meal fees and amenity charges are yours; reductions on application |
| Dental | Covered for standard treatment | same 30% share — unusual among the countries on this site |
| Late enrolment | Not a saving | premiums charged retroactively, up to two years; no benefits meanwhile |
| Ages 40–64 | Long-term care levy added | Kaigo Hoken, folded into the premium bill automatically |
Shares and rules from the official guides. The retroactive-billing row is the one to remember: late enrolment is priced backwards, up to two years, with no benefits for the gap.
Who this page is for
Four situations, four different checks.
The Swiss employee seconded to Tokyo
The Japan–Switzerland agreement (in force since 2012) can exclude you from NHI if you remain insured at home. Obtain the certificate of coverage before departure and show it at the ward office — or you will be enrolled and billed.
The freelancer on a long-stay visa
Employee insurance does not apply, so NHI is compulsory once your stay exceeds three months. Enrol within fourteen days of registering your address; private international cover does not exempt you, and premiums accrue whether or not you sign up.
The language student arriving mid-year
Students join too — but premiums are income-based, and with no prior-year Japanese income yours should be modest. File the municipal income declaration; without it the ward cannot apply reductions and may bill a default rate.
The employee’s spouse and children
Dependants of an employee usually ride the employee scheme, not NHI. Confirm with the employer which family members are certified as dependants — anyone not certified who stays over three months must be enrolled in NHI separately.
An independent benchmark
Sixth globally, and the curve is steep.
- $6,816At 24Indian national, born 2001
- $9,321At 35British national, born 1990
- $14,915At 50American national, born 1975
Dearer than Japan on this measure: China and United Kingdom. Cheaper: Brazil and Mexico.
Japan averages about $10,350 — dearer than Switzerland, Spain and every country in Western Europe bar the UK. What matters more than the rank is the shape: on our own arithmetic against SIP's figures, the 50-year-old persona pays 1.6 times the 35-year-old's premium here, one of the steeper spreads in the index. That mixes age, sex and nationality rather than isolating age — but it is the same direction of travel a policy taken out at 35 will follow.
One thing the index is not, and its authors say so twice: it does not compare the seven insurers against one another. Where two of them price the same country differently, that reflects different benefits, cover areas and networks — not one being better value. And none of these figures is a quote. They are averages for three people who do not exist, and what you would actually pay turns on your age, your health, your family and where you want to be treated.
Source: SIP Health Cost Index 2025, SIP Medical Family Office. Data as at August 2025, published 1 December 2025. Figures rounded to the dollar. Comparisons and any tax-adjusted figures in the text above are our own arithmetic on SIP's published numbers, not SIP findings.
All fifty countries, and what the ranking hidesIn Japan specifically
Three ways this goes wrong, and all three are avoidable.
Reading 70% as “covered”
Thirty per cent of a small bill is nothing and thirty per cent of a large one is a great deal. The share is the same; the exposure is not. This is the gap private cover fills in Japan, and it is a narrow, cheap gap to fill.
Missing the fortnight
The window is short, it starts from your residence card rather than your flight, and it lands in the busiest fortnight of a move. Late registration can bring back payments — so the cost of forgetting is not zero, it is retroactive.
Assuming an international policy exempts you
It generally does not. Enrolment is a condition of residence rather than a question of whether you are already insured, so the sensible structure is usually national cover plus something narrow on top.
Any of these sound like your situation? See how a review works
How a review works
What a first review actually looks like.
Arranging international cover for the first time, or checking what you already hold — the process is the same, in this order.
The demand intake
Right after you book, we email you a short intake form. Where you are, where you're going, who's coming with you, anything you already hold. It takes a few minutes, and it means the 45 minutes start prepared — with your situation, not with paperwork.
We study your situation
Not products first. Your life first. We look at the country you're moving to and what it legally requires, the country after that if there is one, who depends on you, and where the real exposure sits. We don't quote anything at this stage.
The consultation
45 minutes, by video, in English. Every question you bring gets an answer. We compare the international insurers on how each of them behaves in your situation — underwriting, renewal, exclusions, and what happens on the day a claim is filed. If there is already a policy in force, we go through it clause by clause. Nothing is pitched at the end of it.
Your Private Client Report
One working day later, your Private Client Report arrives — around twelve pages setting out what we found, what we weighed it against, what each option costs, and why we would choose one over the others. What to arrange, what to keep, and where you are paying for something that isn't doing any work. Sometimes the report says: keep what you have. It is yours either way.
45 minutes. By video, wherever you are. Free. Nothing has to change afterwards.
The Cleveland Clinic charges $1,690 for a written second opinion. Ours comes with the review, and there is no fee for it.
The team
The people who'll actually review your situation.
Specialists by topic, not a rota. You'll know who you're speaking to before you book, and you'll speak to the same person again next year.
Robert Kolar
Health insurance
Twenty-plus years spent on the distance between what a health policy promises and what it pays when a claim actually lands. German and English. He has been the foreigner working out somebody else's health system from the outside, which is its own kind of qualification.
Book with Robert
Nicole Bohne
Life · Protection · Planning
Spent her career inside Basler Versicherung and Zurich Insurance before crossing to this side of the table. Nicole reads a life-cover decision against the whole household — who depends on whom, what already exists, and whether the answer is a policy at all.
Book with Nicole
Hans Steiner
Pension · Tax · Cross-border
Financial Planner IAF, Federal Diploma of Higher Education. German, English and French. Hans takes the cases where a move collides with a pension, with two tax systems, or with both at once.
Book with HansJapan questions
What people actually ask us about Japan.
What happens if I register for NHI late?
You pay anyway — backwards. The rules require application within fourteen days of becoming eligible, and Osaka’s guide warns late enrollers are required to pay premiums from the time they became eligible, charged retroactively for up to two years. You also cannot claim benefits for care received while unenrolled — so delaying gives you the premiums without the protection, which is the worst available trade.
How much of a medical bill do I pay with Japanese insurance?
Normally 30 per cent, with the insurer paying 70. Children under school age pay 20 per cent, and people aged 70 to 74 pay 20 (30 on working-level incomes) — verified 2026-08-01 against the official guides. The High-Cost Medical Expense system then caps what you can owe in any month at an income-based ceiling, with the excess refunded — so a serious hospitalisation does not mean an uncapped 30 per cent of everything.
I am seconded to Japan from Switzerland. Do I join NHI?
Possibly not — and almost no guide mentions it. Japan’s social-security agreement with Switzerland has been in force since March 2012, and certified insured persons from agreement countries are excluded from National Health Insurance. Obtain the certificate of coverage from the Swiss authorities before departure and show it at the ward office — without it you will be enrolled and billed. The same applies to several other treaty countries.
Do I have to join Japan’s National Health Insurance?
If you are staying beyond three months and are not on an employer’s scheme, yes — Osaka’s official guide states all residents of Japan, including foreign nationals, are required to enrol in public health insurance (verified 2026-08-01). An international policy does not exempt you. One group is exempt: seconded workers from social-security-agreement countries — Switzerland among them — holding a certificate of coverage from home.
How quickly do I need to register?
Fast. The expectation is roughly a fortnight from receiving your residence card, at your municipal office, and registering late can bring back payments for the period you should have been covered.
How much do I pay when I see a doctor?
Around thirty per cent of the cost. That is comfortable for ordinary care and much less comfortable for a serious admission, which is the specific gap worth covering privately.
So should I also hold private insurance?
Often, and smaller than you would expect. The job is not to duplicate the national system but to cap your share of a serious event and to cover treatment outside Japan if you travel.
What happens if I leave Japan?
National cover is tied to residence there and does not travel. If Japan is one chapter of a longer international life, that belongs in the decision on day one rather than at the airport.
How much does international health insurance cost in Japan?
Comparable international private medical insurance in Japan costs about $10,350 a year on average, which ranks Japan 6th of the 50 countries in the SIP Health Cost Index 2025 (data as at August 2025). That is an average across 7 international insurers and three standard profiles — a 24-year-old, a 35-year-old and a 50-year-old — so it describes what the country costs rather than what you would pay. United Kingdom prices higher and Brazil lower. Your own premium depends on your age, your health history, whether you are insuring a family, your deductible, and whether you need cover in the United States.
Does health insurance in Japan get more expensive as you get older?
It rises steeply. In Japan the SIP Health Cost Index 2025 quotes about $9,321 a year for its 35-year-old profile and about $14,915 for its 50-year-old profile — roughly 1.60 times as much, one of the steeper spreads among the fifty countries measured. That comparison is our own arithmetic on the index's published figures, and the two profiles differ in sex and nationality as well as age, so it is not a pure age effect. It is still the direction a policy bought young will travel, which is why the premium a plan charges today matters less than what it will charge when you are least able to change it.
Sources & verification
Where these facts come from.
Every load-bearing claim on this page — the three-month threshold, the fourteen-day window, the 30 per cent share, the two-year retroactive billing — is read from Osaka City's official English NHI guide, corroborated by the MHLW overview. The finding most guides miss entirely: social-security agreements, Switzerland's included (in force since 2012), can exempt seconded workers who hold a certificate of coverage. Premium amounts stay unprinted on purpose — they are municipal and income-based, and any generic figure would be a guess wearing a suit.
- Osaka City — NHI system guide (English, PDF) — PRIMARY — verified 2026-08-01: compulsory enrolment, >3-month rule, 14-day deadline, copay shares, 2-year back-billing, treaty exemptions incl. Switzerland
- MHLW — overview of the medical service regime (PDF) — PRIMARY — verified 2026-08-01: copay bands by age; ⚑ predates the 2022 over-75 changes
- MHLW — English portal — entry point for current national policy pages
- Your municipal NHI office — sets your actual premium — the only honest source for exact figures
From the journal
Reading on this country.
facts checked 2026-08-10
Moving staff to Japan: Shakai Hoken and the 14-day clock
Japanese employers enrol full-time staff in Shakai Hoken. Everyone outside that net — contractors, spouses, leavers — has 14 days to join municipal NHI.
Read it
facts checked 2026-08-10
Japan's nomad visa: excluded from National Health Insurance
Japan's Designated Activities nomad status excludes holders from National Health Insurance and requires private cover instead. Your policy is the whole net.
Read it
facts checked 2026-08-09
Japan health insurance: 14 days to enrol, 2 years backdated
Japan gives residents staying over three months 14 days to enrol in NHI. Miss the window and the ward bills premiums backwards, for up to two full years.
Read itReady for a calm conversation about cover?
A first review is free — 45 minutes, in English, wherever in the world you happen to be. We'll listen first. Then you'll hear exactly what we would arrange if the situation were ours. What you do with that is yours to decide.
Book a reviewOr write to hello@expatsavvy.com — we reply within the working day.