Healthcare Guide

How to Understand Health Insurance in Japan as a Foreigner

A practical guide for foreign residents who need to understand health insurance in Japan — covering the two insurance systems, enrollment, the 70% coverage rule, and how to visit a doctor.

15 min readUpdated March 21, 2026

Problem

Foreign residents often postpone learning about health insurance until they need medical care. By then, they may have missed enrollment deadlines, accumulated back-payments, or simply feel overwhelmed by a system that works very differently from their home country.

In plain English

Health insurance in Japan is mandatory for all residents, including foreigners. This is not optional or something you can substitute with travel insurance from your home country. If you live in Japan for more than three months, you are expected to be enrolled in one of the two public insurance systems.

The good news is that the system is genuinely generous once you understand it. Insurance covers 70% of most medical costs, meaning your out-of-pocket share is just 30%. There is also a monthly cap on expenses — the high-cost medical care benefit (kougaku ryouyouhi seido) — that many foreigners never learn about until they face a large bill.

This guide explains the two insurance systems, how to enroll, what is and is not covered, and what to do when you actually need to visit a clinic or hospital. It is written for people who want practical clarity, not a textbook-level explanation of the entire healthcare system.

1. Why health insurance in Japan is confusing for foreigners

Japan has two parallel public insurance systems, and which one applies to you depends on your employment status. This is the first point of confusion: there is no single system that everyone joins. Company employees are enrolled in Shakai Hoken (Employee Health Insurance), while everyone else — freelancers, students, the self-employed, and unemployed residents — must enroll in Kokumin Kenko Hoken (National Health Insurance, or NHI) at their local city or ward office.

The second source of confusion is that the system works differently from what many foreigners are used to. If you come from the United States, you may expect to choose a private insurer and negotiate coverage. If you come from the UK, you may expect a completely free system with no co-pay. Japan sits in between: everyone pays premiums, everyone gets the same core coverage, and everyone pays 30% of the bill at the point of care.

The third issue is timing. You are expected to enroll within 14 days of establishing residency. If you miss this deadline, you can still enroll later, but you may owe back-premiums for the months you were uninsured. This catches many newcomers who arrive, focus on housing and banking first, and then discover the insurance requirement weeks later.

Finally, many foreigners do not know about the high-cost medical care benefit (kougaku ryouyouhi seido). This system caps your monthly out-of-pocket spending at roughly 35,000 to 80,000 yen depending on your income. Without knowing this, a hospital visit or surgery can feel financially terrifying — even though the safety net exists.

Two systems exist: Shakai Hoken (employee) and Kokumin Kenko Hoken (everyone else).
The 30% co-pay applies to nearly all covered treatments.
Enrollment within 14 days of residency registration is expected.
The high-cost medical care benefit caps monthly out-of-pocket spending.
Travel insurance or overseas private insurance cannot replace the Japanese public system.

2. How the two insurance systems work

Shakai Hoken (Employee Health Insurance) is for people employed by companies that meet the enrollment threshold. If your company enrolls you, you do not need to do anything — your employer handles the paperwork. Premiums are split roughly 50/50 between you and your employer, and they are deducted from your salary automatically. One major advantage is that dependents (spouse and children) can be covered under your plan at no additional premium, as long as they meet income and residency requirements.

Kokumin Kenko Hoken (National Health Insurance / NHI) is for everyone else: freelancers, part-time workers below the enrollment threshold, students, the self-employed, and anyone between jobs. You must enroll in person at your city or ward office. Premiums are calculated based on your previous year's income and the specific formula used by your municipality — this means the same income can result in different premiums in different cities. There is no employer contribution, so you pay the full amount yourself.

Both systems cover the same core medical services at 70% (you pay 30%). This includes doctor visits, hospital stays, surgery, prescription medication, and most diagnostic tests. The coverage is the same whether you use Shakai Hoken or NHI — the difference is mainly in how you enroll and how premiums are calculated.

The high-cost medical care benefit (kougaku ryouyouhi seido) applies to both systems. If your 30% co-pay in a single month exceeds a threshold — roughly 80,100 yen for most working-age adults with average income, or as low as about 35,400 yen for lower-income residents — you can apply for a refund of the excess. You can also apply for a Gengaku Ninteisho (Limit Certificate) in advance so the hospital only charges you up to the cap at the time of treatment.

Some things are not covered by either system. Cosmetic surgery, most dental work beyond basic treatment (ceramic crowns, orthodontics, implants), advanced or experimental medical treatments (sentshin iryou), regular health checkups (unless employer-provided), and most vaccinations for adults are out of pocket. Prescription medication is covered, but some newer or imported drugs may not be on the approved list.

Shakai Hoken: employer-managed, premiums split with employer, dependents covered at no extra cost.
NHI: self-enrolled at city hall, premiums based on previous year's income, no dependent benefit.
Both systems: 30% co-pay, same core coverage for medical care, prescriptions, and hospital stays.
High-cost medical care benefit: monthly cap on out-of-pocket costs, available in both systems.
Not covered: cosmetic procedures, advanced dental work, experimental treatments, most adult vaccinations.

3. Common mistakes foreigners make with health insurance

The most common mistake is not enrolling within 14 days of registering your address. Many newcomers focus on housing, banking, and SIM setup first — all of which are important — but health insurance enrollment at the city office is supposed to happen at the same time as address registration. If you delay, you may owe premiums retroactively for the months you were uninsured.

Another frequent mistake is confusion between Shakai Hoken and NHI. Some people get enrolled in their company's Shakai Hoken but also sign up for NHI at the city office, resulting in double enrollment and double billing. The reverse also happens: a freelancer assumes their employer client handles insurance when they actually need to enroll in NHI themselves.

Many foreigners also assume their home country's travel insurance or international health insurance is a valid substitute. It is not. Japanese hospitals and clinics expect you to present a Japanese insurance card. Without one, you will be charged the full uninsured rate (100% of the cost), and claiming reimbursement from an overseas insurer is a separate, often slow process.

Some people do not realize that changing jobs, quitting, or moving to a different city requires insurance-related paperwork. If you leave a company, your Shakai Hoken coverage ends and you need to switch to NHI within 14 days. If you move cities, you need to re-enroll in NHI at your new city office. Failing to do this creates gaps in coverage.

Finally, many foreigners never learn about the high-cost medical care benefit until they face a large bill. Knowing about this cap in advance — and getting the Limit Certificate (Gengaku Ninteisho) before planned procedures — can save you significant stress and money.

Missing the 14-day enrollment deadline and owing back-premiums.
Double-enrolling in both Shakai Hoken and NHI.
Assuming overseas insurance replaces the Japanese system.
Not switching insurance when changing jobs or moving cities.
Not knowing about the high-cost medical care benefit until it is too late.

Step by step

A simpler application path

Step 1

Confirm which insurance system applies to you

What to do

If you are a company employee working 30 or more hours per week (or meeting the equivalent threshold), your employer should enroll you in Shakai Hoken automatically. Check with your HR department to confirm you are enrolled and ask for your insurance card (hokensho).
If you are a freelancer, self-employed, student, part-time worker below the threshold, or between jobs, you need to enroll in Kokumin Kenko Hoken (NHI) at your city or ward office.
If your spouse is enrolled in Shakai Hoken and you earn less than 1.3 million yen per year, you may qualify as a dependent (hifuyousha) under their plan — meaning you are covered without paying separate premiums.

Why it matters

Knowing which system applies to you is the first step. Getting it wrong leads to double enrollment, missed coverage, or unnecessary premium payments.

What you need

Your employment contract or job offer letter
Information about your work hours and income
Your spouse's insurance status if applicable

Common problems

Assuming part-time or contract work automatically includes Shakai Hoken — it depends on hours and company size.
Not realizing that losing a job means you need to switch to NHI within 14 days.
Freelancers expecting clients to provide insurance coverage.

Practical tip: Ask your employer directly: 'Am I enrolled in shakai hoken?' If the answer is yes, you should receive an insurance card within your first few weeks. If not, head to your city office for NHI.

Step 2

Enroll in National Health Insurance (if applicable)

What to do

Visit the health insurance counter (kokumin kenko hoken madoguchi) at your city or ward office. Many people do this at the same time as address registration — it is the same building.
Bring your residence card (zairyu card), passport, and My Number notification. Some offices also ask for a bank account number or cashcard for setting up premium payments.
You will receive a health insurance card (hokensho) at the counter or by mail within one to two weeks. Until you receive it, ask for a certificate of enrollment (kainyuu shomeisho) in case you need medical care before the card arrives.

Why it matters

NHI enrollment is a legal obligation for residents not covered by Shakai Hoken. Delaying enrollment does not delay your premium obligation — you will owe premiums from the date you became eligible, which is usually your date of address registration.

What you need

Residence card (zairyu card) — original, not a copy
Passport
My Number notification or My Number card
Bank account information (for automatic premium payment setup, recommended)

Common problems

Not knowing the NHI counter exists at the city office — it is separate from the resident registration counter.
Arriving without My Number notification and being sent away.
Delaying enrollment and then receiving a bill for several months of back-premiums.

Practical tip: Do NHI enrollment on the same visit as address registration. After you finish at the resident registration counter, ask where the NHI counter (kokumin kenko hoken madoguchi) is located.

Step 3

Get your insurance card or set up My Number Insurance

What to do

After enrollment, you will receive either a traditional insurance card (hokensho) or use the My Number Card as your insurance card (maina hokensho). The traditional plastic card is being phased out — new enrollees may receive a 'Qualification Confirmation Letter' (shikaku kakunin sho) instead.
To use your My Number Card as an insurance card, register it at a compatible terminal. These are available at city offices, some convenience stores with multi-function copy machines, and pharmacies. The process takes about five minutes.
Carry your insurance card or My Number Card whenever you visit a medical facility. Without it, the clinic may ask you to pay the full 100% cost upfront and seek reimbursement later.

Why it matters

Your insurance card or My Number Card is your proof of coverage. Presenting it at reception is how the 30% co-pay rate is applied. Without it, you are treated as uninsured.

What you need

Traditional insurance card (hokensho) — issued after enrollment
Or: My Number Card with insurance registration completed
Or: Qualification Confirmation Letter (shikaku kakunin sho) for newer enrollees

Common problems

Forgetting to bring the card to a clinic visit and being charged the full amount.
Not knowing that My Number Card can be used as an insurance card after registration.
Confusion about the transition from plastic insurance cards to the new system.

Practical tip: Keep a photo of your insurance card on your phone as a backup. Most clinics accept the physical card at reception, but having the details handy helps if you forget it.

Step 4

Visit a clinic or hospital

What to do

For non-emergency care, visit a clinic (kurinikku or shinryoujo) first rather than a hospital. Japan's system is designed so that clinics handle initial consultations, and hospitals handle referrals and specialized care. Going directly to a large hospital without a referral may incur an extra fee of 5,000 to 7,000 yen.
At the reception desk (uketsuke), present your insurance card and fill out a first-visit questionnaire (shoshin hyou). This form asks about your symptoms, allergies, current medications, and medical history. Some clinics have English forms, but many do not — having a translation app ready or bringing a Japanese-speaking companion helps.
After your consultation, pay the 30% co-pay at the payment window. If medication is prescribed, you will receive a prescription (shohousen) to take to a nearby pharmacy (yakkyoku). The pharmacy is separate from the clinic — you pay the 30% co-pay for medication there as well.

Why it matters

Understanding the clinic-first system, the paperwork at reception, and the separate pharmacy step prevents confusion and delays when you actually need care.

What you need

Insurance card (hokensho) or My Number Card with insurance registration
Cash or a payment method accepted by the clinic (not all accept credit cards)
Prescription (shohousen) from the doctor if medication is prescribed
Optional: a list of current medications and known allergies in Japanese

Common problems

Going to a hospital instead of a clinic for a non-emergency and paying the extra referral-bypass fee.
Not knowing the pharmacy is separate — walking out of the clinic expecting medication to be handed to you.
Assuming all clinics accept credit cards — many smaller clinics are cash only.
Struggling with the first-visit questionnaire in Japanese.

Practical tip: Search for English-speaking clinics in your area using the AMDA International Medical Information Center (amda-imic.com) or the JNTO medical facility search. Even if your Japanese is good, having a doctor who can explain a diagnosis in English reduces misunderstanding.

Step 5

Handle insurance changes when your situation changes

What to do

If you leave a company, your Shakai Hoken coverage ends on your last day. You must enroll in NHI at your city office within 14 days. Bring the certificate of loss of insurance (shikaku soushitsu shoumeisho) from your former employer.
If you start a new job with Shakai Hoken, your new employer handles enrollment. Visit your city office to cancel your NHI — this is not automatic, and failing to cancel means double billing.
If you move to a different city, cancel NHI at your old city office and re-enroll at the new one. Your premium may change because each municipality calculates rates differently.
If you are leaving Japan permanently, cancel your insurance and pay any outstanding premiums before departure. You may be eligible for a partial refund if you have overpaid.

Why it matters

Every change in employment or address requires an insurance action. Leaving gaps or overlaps creates billing problems that are difficult to resolve after the fact.

What you need

Certificate of loss of insurance (shikaku soushitsu shoumeisho) from former employer — when switching from Shakai Hoken to NHI
New insurance card from new employer — when switching from NHI to Shakai Hoken
Residence card and current insurance card — for address changes

Common problems

Not canceling NHI after starting a job with Shakai Hoken, leading to months of double billing.
Forgetting to re-enroll in NHI after leaving a company, creating a gap in coverage.
Assuming insurance transfers automatically when moving between cities.
Leaving Japan without canceling insurance and having unpaid premium notices pile up.

Practical tip: Whenever you leave a job, ask HR for the certificate of loss of insurance (shikaku soushitsu shoumeisho) on or before your last day. You need this document to enroll in NHI — without it, the city office process is slower.

Notes

This guide provides general information about the Japanese health insurance system for foreign residents. It is not medical advice, legal advice, or a substitute for consultation with a qualified professional.
Insurance premiums, coverage details, and administrative procedures can vary by municipality, employer, and individual circumstances. Always confirm the latest requirements with your city or ward office, employer, or the relevant insurance provider.
The information in this guide reflects the system as of early 2026. Japan's health insurance system is subject to policy changes — check official sources for the most current rules.

Healthcare Guide

Official links

Accepted documents, eligibility, and online steps can change. Check the official page before you visit a counter or submit an application.

Ministry of Health, Labour and Welfare (MHLW) — Health Insurance Overview

Official English-language overview of Japan's health insurance system from the national ministry.

Open official page

Japan Health Insurance Association (Kyokai Kenpo)

The largest Shakai Hoken provider. Useful for understanding employee health insurance coverage details.

Open official page

AMDA International Medical Information Center

Multilingual medical consultation hotline and directory of medical facilities that support foreign languages.

Open official page

JNTO — Medical Facility Search

Search for hospitals and clinics that offer services in English and other languages.

Open official page

Digital Agency — My Number Insurance Card

Information about using your My Number Card as a health insurance card.

Open official page

Related guides

Explore healthcare resources

New to Japan Setup Checklist

Health insurance is step 5 in the broader setup flow. Use the checklist to see how it connects to earlier steps.

How to Open a Bank Account in Japan

Your bank account is needed for automatic insurance premium payments. Set this up before or alongside insurance enrollment.

How to Get a SIM Card in Japan

A working phone number helps when calling clinics for appointments or receiving follow-up from medical facilities.

How to Rent an Apartment in Japan

Address registration triggers your NHI enrollment eligibility. The housing and insurance timelines overlap.

FAQ

Guide FAQ

Quick answers to common questions around this guide.

Is health insurance mandatory for foreigners in Japan?

Yes. All residents of Japan, including foreign nationals with a residence period of three months or longer, are legally required to be enrolled in either Shakai Hoken (through their employer) or Kokumin Kenko Hoken (National Health Insurance at the city office). There is no opt-out.

How much does health insurance cost?

For Shakai Hoken, premiums are roughly 5% of your monthly salary (your share after the employer pays the other half). For NHI, premiums depend on your previous year's income and your municipality's formula — a common range for a single person is 10,000 to 40,000 yen per month, but it varies widely.

What does 30% co-pay look like in practice?

A typical clinic visit for a cold or minor issue costs around 2,000 to 4,000 yen out of pocket (30% of the total). Prescription medication at a pharmacy adds roughly 500 to 2,000 yen. A more involved visit with blood tests might cost 3,000 to 6,000 yen. Hospitalization is more expensive but capped by the high-cost medical care benefit.

Can I use my home country's insurance instead?

No. Japanese clinics and hospitals expect a Japanese insurance card. Without one, you will be charged the full uninsured rate (100%). Some overseas insurance may reimburse you afterward, but the process is separate and often slow. You are still legally required to be enrolled in the Japanese system.

Can I see a doctor in English?

Yes, in many cities, especially Tokyo and Osaka. Use the AMDA International Medical Information Center (amda-imic.com) or the JNTO medical facility search to find clinics and hospitals that offer services in English. In smaller cities, options are more limited — a translation app or Japanese-speaking companion can help.

What is the high-cost medical care benefit?

The high-cost medical care benefit (kougaku ryouyouhi seido) caps your monthly out-of-pocket medical expenses at a level determined by your income. For most working-age adults, the cap is roughly 80,100 yen per month. If you exceed this amount, you can apply for a refund — or get a Limit Certificate (Gengaku Ninteisho) in advance so the hospital only charges you up to the cap.

Healthcare Guide

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