Japan’s National Health Insurance: What You Need to Know 2025 Guide
A clear, practical guide to Japan’s National Health Insurance (NHI) in 2025—who must join, how to enroll, what it covers, copay rates, high-cost protections, premiums, and smart tips for expats and students. Simple steps, helpful tables, and internal links throughout.
National Health Insurance at a glance
National Health Insurance (NHI) is Japan’s public health plan for residents who are not covered by an employer’s health insurance. In most cities and towns, the local municipal office administers NHI. If you live in Japan for more than the short term and aren’t on a company plan, you will most likely need to join NHI. It offers wide coverage, predictable out-of-pocket costs, and strong protection when medical bills are high.
Related read: Moving to Japan basics
Who should join National Health Insurance
You are generally expected to enroll in NHI if:
- You are a resident of Japan (foreigner or Japanese) registered at city hall, and
- You are not currently covered by Employees’ Health Insurance (via your employer) or certain other public schemes.
Common situations:
- Freelancers, contractors, and sole proprietors: No company plan, so NHI is typical.
- Students and working holiday makers: Unless your school or employer enrolls you elsewhere, you’ll use NHI.
- Dependents without their own employer coverage: In NHI, each person becomes a member; the household pays the bill, but individuals carry their own insurance cards.
Who does not join NHI
- Employees on a company plan: If your employer enrolls you in Employees’ Health Insurance (often called “shakai hoken”), you don’t join NHI.
- Late-stage elderly system members: Residents aged 75+ (and some 65–74 with certain disabilities) are covered by a separate public system.
- Short stays: Tourists and very short-term visitors don’t enroll; travel insurance is the appropriate option.
When and where to enroll
Enroll as soon as you register your address at city hall. Most municipalities expect you to complete NHI procedures within about two weeks of moving into or out of a city, changing jobs out of a company plan, or losing/deleting a previous insurance policy.
Where to go:
- Your municipal office (city/ward/town/village) NHI counter.
- In some regions, branch offices or service centers also accept applications.
Related read: Registering your address at city hall
What to bring to enroll
The exact list can vary slightly by municipality, but you can prepare:
- Residence card and passport
- My Number (if issued)
- Certificate of moving-out (if you moved from another Japanese city)
- Proof of previous insurance status (e.g., company insurance exit letter)
- Inkan (personal seal) or signature
- Bank book or card if setting up auto-debit
- Residence record for family members joining with you (spouse, children)
Tip: If you’re waiting for a document, visit the counter anyway. Staff can advise how to proceed and what temporary proof they can accept.
Your NHI insurance card and the My Number transition
Traditionally, each member receives a health insurance card. Japan is transitioning to a system where your My Number card can function as a health insurance card in clinics and pharmacies. Expect continued support for both methods during the nationwide transition period; clinics will indicate whether they can read My Number cards at reception. Always carry some form of health insurance proof to your appointment.
What National Health Insurance covers
NHI covers a broad set of medically necessary services at approved medical institutions:
- Doctor visits in clinics and hospitals
- Tests and imaging (bloodwork, X-ray, CT/MRI when prescribed)
- Prescribed medicines at pharmacies
- Hospitalization and surgery
- Rehabilitation, home nursing, and medical devices when approved
- Maternity-related support (e.g., a lump-sum benefit toward childbirth and partial coverage for related care; emergency medical care during pregnancy is covered if medically necessary)
Cosmetic treatments and purely elective procedures are not covered. Dental care for medically necessary treatment is usually covered; cosmetic orthodontics is not. Ask the reception desk whether a service is covered or self-pay before you agree to it.
Copay rates you actually pay
In Japan you pay a copayment at the point of service; the insurer pays the rest directly to the clinic or hospital. Typical copay patterns are:
- Adults: usually 30%
- Young children: often 20% (national standard), with many cities offering extra local subsidies that can further reduce your share—ask your city hall or the clinic.
- Ages 70–74: 20% for most residents; 30% for certain higher-income households.
- Ages 75+: covered under the separate late-stage elderly system with its own rules.
Pharmacies apply the same copay to the insured portion of your prescription. If you choose brand-name drugs when an equivalent generic exists, you may pay more out of pocket. If budget is a concern, tell the doctor and pharmacist you prefer generics.
Related read: How to see a doctor in Japan
High-Cost Medical Care Benefit protection
Japan’s system includes a monthly cap on what you pay for covered care, based on your household’s income category. If your month’s medical bills are very high, your out-of-pocket amount is limited to a ceiling and the remainder is covered by the system. You can:
- Apply after the fact for reimbursement, or
- Present a “limit certificate” (gengaku ninteisho) in advance for inpatient care so the hospital only charges you up to your ceiling during admission.
If you are hospitalized or scheduled for surgery, ask your NHI counter for the correct form before admission so you don’t have to front large amounts.
NHI premiums in plain language
Premiums are collected by your municipality, and are calculated at the household level, then billed to the head of household. The exact math differs by city/ward, but most use a combination of:
- Income-based portion: Based on your previous year’s Japan-taxable income.
- Per-capita portion: A flat amount per insured person in the household.
- Equal (household) portion: A fixed amount per household.
- Long-term care contribution (for ages 40–64): Adds a separate component to fund Japan’s long-term care insurance.
What this means for you:
- If you arrived this year and had no Japan income last year, your income-based portion may be low (or zero), but you’ll still pay the per-capita and equal portions.
- If you earned in Japan last year, expect the income-based part to drive most of your bill.
- Rates and caps vary by municipality, so two similar households can pay different premiums in different cities.
Related read: Utility costs and budgeting in Japan
Reductions and exemptions
Municipalities offer standardized reductions for low-income households, new residents with little taxable income, and households facing hardship. These typically reduce the per-capita and equal portions by set percentages, and sometimes allow payment plans.
Ask about:
- Low-income reduction: Percentage-based relief if your previous year’s income falls below a threshold.
- Student status: Some cities offer special reductions for students.
- Hardship or disaster: Temporary reduction, deferral, or exemption after job loss or other hardship.
If you qualify, apply promptly—some reductions aren’t applied retroactively.
Related read: Money-saving tips for life in Japan
How to pay premiums
Municipalities usually offer several payment methods:
- Bank auto-debit (highly recommended to avoid missed payments)
- Convenience store slips (monthly, bimonthly, or one-time)
- Bank counter
- Online or app-based payment in some cities
You’ll receive payment slips after enrollment and every spring when the new fiscal year rates start. If a slip goes missing, contact your municipal office quickly to avoid late fees.
Related read: How to pay bills in Japan
What happens if you enroll late
If you were required to join NHI but delayed applying, the city can backdate your enrollment to the date you became eligible (for example, the day you left a company plan, or the day you registered your address). That means you may be billed for retroactive premiums. On the positive side, NHI can also consider past covered medical bills from that backdated period once your enrollment is sorted out. If you’re in this situation, visit the NHI counter as soon as possible.
Step-by-step enrollment checklist
Use this quick path to join smoothly:
- Register your address at city hall (zairyū card updated).
- Go to the NHI counter right after address registration; take the documents listed earlier.
- Complete the application for everyone in your household who needs coverage.
- Set up auto-debit for premiums if available.
- Receive your insurance card (or proof) and confirm your copay category.
- Ask about reductions and bring income documents if you might qualify.
- Download your city’s NHI guide (English versions exist in many cities) and save the NHI hotline.
Copay and coverage table
| Item | What you pay with NHI | Notes |
|---|---|---|
| Clinic visit | Usually 30% | Children often 20%; local child subsidies may further reduce |
| Hospital outpatient | Usually 30% | Same rate as clinics for covered services |
| Hospitalization | Usually 30% | Use a limit certificate to cap costs at the counter |
| Prescription drugs | Usually 30% | Ask for generic to lower cost |
| Preventive care | Varies | City programs cover some checkups/vaccines; ask city hall |
| Dental treatment | Covered if medically necessary | Cosmetic or elective care is self-pay |
Related read: Vaccinations and health checkups in Japan
Using NHI at clinics and hospitals
- Bring your card (health insurance or My Number used as one).
- Show it at reception and confirm your copay category.
- Pay the copay after treatment or tests.
- Take prescriptions to a pharmacy; show your card again and pay the drug copay.
- Keep receipts (ryōshūsho) in case you need to apply for the High-Cost Medical Care Benefit or medical expense deductions at tax time.
Tip: Some large hospitals require a referral letter from a clinic. Without one, you may be charged an additional fee (not covered by NHI). If you’re unsure, start at a neighborhood clinic.
Language and accessibility tips
- Many clinics list spoken languages on their websites or regional medical search portals.
- If language is a hurdle, consider clinics near universities or major expat areas; they often have English support.
- Prepare a short list of your medications and allergies in Japanese (or show the generic drug names).
- For emergency numbers, remember: 119 for ambulance/fire.
Related read: Emergency numbers and what to say
Maternity and family benefits
- Childbirth lump-sum allowance: A one-time cash benefit helps cover delivery costs; your city office or insurer can confirm the current amount and direct or reimbursement method used by your hospital.
- Child medical subsidies: Many cities offer extra support that lowers or eliminates medical copays for children up to a certain age. Rules differ by municipality, so check your ward’s child health page.
Related read: Having a baby in Japan
Long-term residents, students, and part-time workers
- Students: If you’re not on a school-provided plan, enroll in NHI at your city hall. Ask about student reductions.
- Part-time workers: If your part-time employer doesn’t qualify you for Employees’ Health Insurance, you’ll use NHI. If your hours or income increase and you become eligible for a company plan, switch at that time.
- Freelancers and contractors: Track your income, set aside funds monthly for premiums and taxes, and explore low-income reductions if your previous year’s taxable income is modest.
Related read: Working part-time and freelancing in Japan
Moving, job changes, and leaving Japan
- Moving within Japan: Tell your old city you’re leaving and new city that you’ve arrived. You will leave the old city’s NHI and join the new city’s NHI—premiums and member numbers can change.
- Changing to a company plan: When your company coverage starts, notify the city to quit NHI from the correct date (and return cards if asked).
- Leaving Japan: Before departure, quit NHI at city hall to stop billing and settle any remaining premiums or refunds.
Related read: City hall checklist when you move
Common questions
Do I need NHI if I already have international private insurance?
If you are a registered resident and not on a company plan, you generally still must join NHI. Private policies can be secondary for extras like private rooms or overseas care.
What if I forgot to pay last month?
Pay immediately and contact the NHI office if you need a payment plan. Long nonpayment can lead to card restrictions and collection action, so don’t delay.
Can I claim costs from overseas treatment?
NHI has a limited overseas medical expense reimbursement scheme for medically necessary care, but paperwork is strict and the reimbursement equals what the same treatment would have cost in Japan. Always keep detailed receipts and medical reports.
Does NHI cover mental health?
Yes—psychiatry and counseling ordered by a physician at covered clinics/hospitals are included. Purely private counseling without a physician’s referral may not be covered.
Are vision and dental covered?
Basic medical eye care (e.g., infection, glaucoma) and medically necessary dental care are covered. Routine eyeglasses and cosmetic orthodontics are not.
Related read: Private health insurance options in Japan
Premiums and budgeting tips
- Set up auto-debit the day you enroll so you never miss a payment.
- Rough-plan your year: Premiums reset each fiscal year (often June–July billing cycles); amounts can change with your income.
- Ask about reductions early: Take proof of income or student status when you enroll.
- Choose generics: Tell your doctor and pharmacist you prefer generic drugs to reduce pharmacy copays.
- Use the High-Cost Medical Care Benefit: For planned hospitalizations, get a limit certificate ahead of time so you don’t have to front large sums.
Related read: Cost of living and monthly budget in Japan
Table: Enrollment scenarios and what to do
| Scenario | What to do | Why it matters |
|---|---|---|
| Arrived in Japan and registered address | Enroll at NHI counter right away | Avoid retroactive bills and be covered from day one |
| Left a company plan last week | Bring company exit letter and join NHI within two weeks | Prevent coverage gaps |
| Moving to a new city next month | Quit old city’s NHI and join new city’s NHI | Premiums and cards are city-specific |
| Hospitalization scheduled | Ask city hall for a limit certificate | Caps your out-of-pocket at the counter |
| Income dropped this year | Ask about reductions and payment plans | You may qualify for relief |
Key terms to know
- National Health Insurance (NHI): Public health plan administered by your municipality.
- Copayment: The percentage you pay at the clinic or hospital (e.g., 30%).
- High-Cost Medical Care Benefit: Monthly cap on your out-of-pocket based on income.
- Limit certificate (gengaku ninteisho): Paper that lets hospitals charge you only up to your cap while admitted.
- My Number card: National ID card that is increasingly used as a health insurance card.
- Per-capita, equal, income-based portions: The pieces that make up your NHI premium.
A simple action plan for 2025
- Enroll immediately when you register your address or leave a company plan.
- Set up auto-debit and save copies of your payment slips.
- Ask about reductions if your previous-year income was low or if you’re a student.
- Carry your card (or My Number used as a card) to every clinic and pharmacy.
- Get a limit certificate before planned hospitalization.
- Choose generics and confirm whether a service is covered or self-pay.
- Update the city when you move, change jobs, or leave Japan.
Final word
NHI is one of the biggest advantages of living in Japan: affordable access to quality care, predictable copays, and strong protection against large bills. Enroll on time, set up easy payments, and learn the few tools that matter—your card, generics, and the limit certificate—and you’ll navigate Japan’s health system with confidence.
