Health Insurance in Japan: How the Public System Works for Residents

A plain-language overview of Japan's universal public health insurance: who joins, the main types of plan, what patients typically pay, and how the card is used at clinics.

Published October 20, 2026 at 11:05 AM JST | By Tokyo Paul

Quick answer: Japan requires residents to be covered by public health insurance, either through an employer plan or through National Health Insurance run by the municipality. Patients usually pay a share of each bill, commonly 30 percent according to the Ministry of Health, Labour and Welfare, with shares that can differ by age and income, and a monthly cap applies to very high medical costs.

Universal coverage in brief

Japan's system is built on the principle that everyone who lives in the country should be covered. Official guidance for foreign residents states that all residents must be enrolled in a health insurance system, and the rule applies to Japanese citizens and foreign residents alike. Coverage means that people can go to clinics and hospitals across the country and have a large part of the cost paid by the insurance fund.

In practice, almost everyone falls into one of a few groups. Employees are covered through their workplace, self-employed people, students, retirees and others are covered through the National Health Insurance program of their city or ward, and people aged 75 and over are in a separate system for later life. Each has its own rules about premiums, but the benefits are broadly similar.

Official guidance explains that National Health Insurance is funded by member premiums together with tax money from national and local governments, which pays about half. Because it is organized around the municipality or the workplace, the first step for a new resident is always to find out which group applies to them.

Employee insurance

People who work for companies are usually enrolled through their employer. Coverage under employees' health insurance is generally compulsory for workers at covered workplaces, and premiums are commonly shared between the employer and the employee. The employer deducts the employee's share from salary and pays the total, so the worker does not need to handle payments separately.

Which workplaces and part-time workers are covered depends on conditions such as size, working hours and wage, and the rules have been widening in recent years. If you are unsure whether you are enrolled, ask your employer's administrative staff. Dependent family members may be covered under the employee's plan, depending on conditions, so ask about that when you start a job.

National Health Insurance

National Health Insurance, often shortened to kokuho, is run by municipalities for people who are not covered by an employer plan. This includes self-employed people, farmers, students, unemployed people, retirees who have left an employer plan and foreign residents who meet the conditions. Official guidance says foreign residents with a stay of more than three months who are not covered elsewhere must join.

To join, you register at the National Health Insurance counter of your city or ward office, generally within 14 days of becoming eligible, and you also notify the office within 14 days when you leave the system, for example when you move or start a job with insurance. Premiums are set by each municipality and commonly depend on income and household makeup, and reductions may be available for low-income households.

What patients pay

At a clinic or hospital you usually pay a share of the cost at the counter, and the insurance fund pays the rest. The Ministry of Health, Labour and Welfare says patients usually pay 30 percent of medical costs, with insurance covering the remaining 70 percent. Young children and many older people often pay a lower share, and rates for older age groups depend on age and income. Check the current rate for your age group with your insurer, because these shares are set by national rules and can be revised. Some local governments may also run separate support programs for children, so ask your ward office whether you qualify for any help with the remaining share.

Not every service is covered. Insurance mainly covers treatment for illness and injury, and some items such as private rooms or certain procedures may be paid separately. Prices for covered services follow a national fee schedule, so a standard treatment generally costs about the same wherever you go in Japan, which makes bills predictable.

High-cost medical expenses

The high-cost medical expense system protects households from very large bills. Each month there is a cap on what a person pays for covered care, and the cap depends on age and income. If you pay more than your cap, the extra amount is paid back through the system.

Under the My Number Card health insurance function, the cap can be applied at the counter if you choose to provide your limit information, so you do not have to pay and wait for reimbursement. If you do not use that function, ask your insurer about a certificate of the maximum amount. The specific cap amounts change, so see your insurer or municipal office for the current figures.

Using your card at a clinic

At the reception desk of a clinic, hospital or pharmacy, you show your health insurance proof. Today that is usually a registered My Number Card used with the reader, or an Eligibility Confirmation Form from the insurer for people who do not use a card. Official guidance says the older insurance cards stopped working after 1 December 2025, so check which document you now need.

Many people also use the clinic's reader to share medication and checkup history so that doctors and pharmacists have complete information, but sharing is optional. Always bring your card or certificate on the day, as without proof you may be asked to pay in full first.

Practical tips for new residents

Check your status when you arrive. If you are employed, ask whether you have been enrolled. If not, go to the municipal office with your residence card to register for National Health Insurance. Keep paying premiums on time, because unpaid premiums can lead to penalties or limited benefits. If payment is difficult, ask the office about reductions or payment options.

If your Japanese is limited, find a clinic that fits your language needs, and ask the office about English-friendly options and about interpretation. When you change jobs or move, update your insurance right away. This guide shares general information; rules change, so confirm details with the official agency or provider before you act. The city or ward office is the best first stop for questions about your own plan, premiums and eligibility.

Frequently Asked Questions

Do foreign residents have to join Japan's health insurance?

Yes, residents with a stay of more than three months who are not covered by an employer plan must join National Health Insurance. Employees are covered through their workplace. Register at your city or ward office, generally within 14 days of becoming eligible.

How much do patients pay at the clinic?

The Ministry of Health, Labour and Welfare says patients usually pay 30 percent, and the insurance covers the rest. Shares can be lower for young children and many older people, depending on age and income. A monthly cap applies for very high costs. Confirm your own rate with your insurer.

What do I show at the clinic reception?

Show a registered My Number Card at the card reader, or an Eligibility Confirmation Form from your insurer if you do not use the card. Older insurance cards stopped working after 1 December 2025. If you are unsure, ask the clinic or your insurer before the visit.

Want to go deeper? Tokyo Paul's book Building a Life in Japan is available on Amazon.

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More guides from Tokyo Paul: My Number Card in Japan: What It Is and Why Residents Use It, Japan's Public Pension System: A Plain-Language Overview for Residents and Getting Help in Japan: Emergency Numbers and Clinics for Visitors.