Before you start

A long-stay visa and an Alien Registration Card
A registered Busan address, which is where NHIS posts your card and bills
An employer, for workplace enrolment, or readiness to pay the local-subscriber premium
A Korean bank account for premium auto-debit

Step-by-step

1
Work out which subscriber category you fall into
Employees of a registered company are enrolled by their employer from day one and the premium is split roughly evenly between you and them. Everyone else — freelancers, students, spouses, people between jobs — becomes a local subscriber automatically once residence passes six months. There is no uninsured option.
Via employerWho: Your employer's HR, or NHIS directlyAutomatic; local subscribers at the six-month mark
2
Set up auto-debit from a Korean account
Local-subscriber bills arrive by post in Korean and are extremely easy to ignore. Set up direct debit as soon as the account exists. Unpaid premiums accumulate as arrears and Korean immigration checks NHIS payment status at visa extension, so this is a residency problem rather than only a money one.
OnlineWho: YouAs soon as the account exists
3
Use a neighbourhood clinic before a hospital
Korea runs a tiered system with tiered co-payments. Walk into a local clinic for anything ordinary — no appointment, no referral, and a co-payment usually in the ₩5,000–8,000 range. General and university hospitals charge a substantially higher share, and the largest tertiary hospitals normally want a referral letter first.
In personWho: YouSame-day walk-in
4
Know where English-language care actually is in Busan
The university hospital cluster — Pusan National University Hospital in Seo-gu and its Yangsan campus, Dong-A University Hospital, Inje University Haeundae Paik Hospital and Kosin Gospel Hospital — runs the international and interpretation services. Most neighbourhood clinics operate in Korean only, and the 1330 travel hotline provides live medical interpretation over the phone.
In personWho: YouWorth identifying before you need it
5
Understand the pension and whether your nationality can reclaim it
National Pension enrolment runs alongside health insurance for most workers. On permanent departure a lump-sum refund is available, but only where a social security agreement provides for it or your country grants Koreans the equivalent. Americans, Canadians and Germans can generally claim; British and Chinese nationals generally cannot. Confirm with the NPS on 1355 before assuming either way.
OnlineWho: YouClaimed on departure
6
Decide whether you want a private top-up
Because NHIS covers most of the bill, private insurance here is a top-up rather than a substitute. The standard Korean product reimburses much of your remaining co-payment; international plans buy English service and direct billing instead. Many residents carry neither and simply pay the small co-payments.
OnlineWho: You, with a private insurerOptional

Documents you’ll need

Alien Registration Card — this is your everyday healthcare ID
Passport, for hospital registration before the ARC issues
NHIS card or certificate, posted after enrolment
Korean bank account details for auto-debit
Referral letter, for tertiary hospital treatment

Things most newcomers don’t know

The local-subscriber premium is benchmarked to the national average, not to what you earn in Korea.

Foreign local subscribers are charged no less than the average premium across all subscribers, so a student or an early-stage freelancer with nearly no Korean income still receives a substantial monthly bill. People arriving with the mental model of an income-based contribution budget for almost nothing and then get a demand they were not expecting. The figure is reset annually.

Source: NHIS — guidance for foreigners

Unpaid health insurance premiums can cost you your visa extension, not just your credit.

Korean immigration checks NHIS arrears when you extend your stay, so a bill you ignored because it arrived in Korean can surface a year later as a refused extension. This links two systems that most countries keep entirely separate, and it catches local subscribers hardest because nobody is deducting the premium for them. Auto-debit removes the risk completely.

Source: NHIS; Korea Immigration Service

Whether you get your pension contributions back is decided by your passport, not your contributions.

The lump-sum refund on leaving Korea is paid where a social security agreement provides for it or where your country would treat a Korean the same way. Roughly thirty-odd nationalities qualify, including Americans, Canadians and Germans; British and Chinese nationals generally do not. Two colleagues who paid identical contributions for identical years can get entirely different answers, so check yours with NPS early.

Source: National Pension Service

Going straight to a big Busan hospital for something minor costs you several times more.

The co-payment share rises with the tier of institution, and the largest hospitals also expect a referral from a clinic. Foreign residents gravitate to the university hospitals because that is where the English service is, and end up paying tertiary rates for a sore throat. Find a neighbourhood clinic near home for ordinary problems and save the big hospitals for what needs them.

Source: NHIS; Korean tiered co-payment system

Common mistakes to avoid

Assuming private or international cover exempts you from NHIS — it does not.
Ignoring Korean-language premium bills as a local subscriber and building arrears.
Budgeting the local-subscriber premium as if it scaled with your Korean income.
Defaulting to a university hospital for minor complaints and paying tertiary co-payments.
Leaving Korea without checking whether your nationality can claim the pension lump sum.

Some of this may be out of date. Spotted something inaccurate? Help us keep it right for the next newcomer.