Before you start

A valid long-stay visa (D, E, or F series) and an Alien Registration Card (ARC / 외국인등록증)
A registered Korean residential address (NHIS mails your card and bills there)
An employer (for workplace enrollment) OR readiness to pay the local-subscriber premium yourself
A Korean bank account for auto-debit of premiums, plus your passport for hospital registration

Step-by-step

1
Understand that NHIS enrollment is mandatory and automatic
Under the 2019 rule, every foreigner who stays in Korea 6 months or longer is compulsorily enrolled in NHIS — you cannot opt out. If you work for a registered company you're enrolled as a 'workplace' subscriber from day one and the premium (around 7.19% of salary) is split 50/50 with your employer and deducted from pay. If you have no employer you're an automatically-registered 'local subscriber' billed a monthly premium directly.
Via employerWho: Employer HR (workplace) or NHIS (local subscriber)Automatic; local subscribers enrolled once they pass 6 monthsEmployee: ~3.6% of salary; local subscriber: floor ~₩150,000/mo (~US$110)
2
Activate coverage and get your insurance card
Once enrolled you receive a health insurance card (건강보험증) by post within a few weeks, but you usually don't need the physical card — your ARC is enough to be looked up at any clinic or hospital. Set up auto-debit from a Korean bank account so premiums are never missed. You can check status, get an English certificate of coverage, or ask questions via the NHIS English helpline or the English website.
OnlineWho: NHISCard arrives in a few weeks; coverage is active immediatelyFree to register
3
Use neighbourhood clinics (의원) before hospitals (병원)
Korea has a tiered system: walk straight into a local clinic (의원, uiwon) for everyday issues — no appointment or referral needed — where your NHIS co-pay is only about 20% (roughly ₩5,000-8,000 for a GP visit). General hospitals (병원) and tertiary university hospitals (대학병원) charge a higher co-pay share (~30-50%) and a tertiary hospital generally wants a referral letter from a clinic first. Going straight to a big hospital without a referral means you pay much more.
In personWho: YouSame-day walk-in at clinicsGP clinic visit co-pay ~₩5,000-8,000 (~US$4-6)
4
Consider optional private top-up (실비/silson) insurance
Because NHIS already covers most costs, private insurance is a top-up, not a substitute. The common product is 실손의료보험 (silson, 'actual-cost' insurance), ~₩30,000-80,000/month, which reimburses much of your remaining co-pay and some non-covered items. Expats may also choose an international plan for English service, direct billing, dental/vision, or medical evacuation. Many people skip private cover entirely and just pay the small co-pays.
OnlineWho: Private insurer (optional)Optional; arrange anytime실비 ~₩30,000-80,000/mo (~US$22-60); international plans more
5
Know emergencies (119) and pharmacies (약국)
For a real emergency call 119 (free, fire/ambulance/medical) or go to an ER (응급실); for non-urgent medical advice and interpretation call 1339. Note that big-hospital ERs in Seoul can be crowded. Korea separates prescribing from dispensing (의약분업): the clinic gives you a prescription, which you fill at a nearby pharmacy (약국, green-cross sign) for a small co-pay (~₩2,000-5,000). Basic OTC meds (painkillers, cold remedies) are sold in convenience stores.
In personWho: You / 119 / pharmacistImmediatePharmacy co-pay ~₩2,000-5,000 (~US$2-4) per prescription

Documents you’ll need

Alien Registration Card (외국인등록증) — your everyday healthcare ID
Passport (for hospital/clinic registration, especially before your ARC issues)
NHIS health insurance card / certificate (건강보험증) — mailed after enrollment
Korean bank account details for premium auto-debit

Things most newcomers don’t know

Enrollment is compulsory and automatic — you cannot shop around or opt out, and as a local subscriber you'll pay a floor premium (around ₩150,000/month) even with zero Korean income.

Since 2019, foreigners staying 6+ months are auto-enrolled, and the rule for foreign local subscribers sets the premium at no less than the national all-subscriber average, so a low income won't lower it much. Newcomers are often surprised to be billed despite earning nothing locally.

Source: NHIS — Guidance for foreigners (nhis.or.kr/english)

Care is genuinely world-class yet cheap: a clinic GP visit typically costs you only about ₩5,000-8,000 out of pocket and a prescription a few thousand more.

NHIS covers roughly 60-70% of costs and your co-pay at neighbourhood clinics is only ~20%. Korea is a medical-tourism hub with fast access and modern facilities, which is why most residents need little or no private insurance.

Source: Korea healthcare cost guides (2026)

Don't let premiums go unpaid — arrears can derail your visa extension and other immigration procedures.

Korean immigration links NHIS payment status to long-term residence: unpaid health-insurance premiums can result in visa-extension denials, so missing the monthly bill is far more consequential than in many other countries. Setting up bank auto-debit avoids this entirely.

Source: Multiple 2026 expat NHIS guides

Major Seoul hospitals run dedicated International Healthcare Centers with English-speaking staff — use them for anything complex.

Severance (Yonsei), Asan Medical Center, Samsung Medical Center, and Seoul National University Hospital all have International Healthcare Centers offering English service and interpretation. Small neighbourhood clinics, by contrast, may have limited English, so language — not cost — is the real barrier.

Source: Hospital International Healthcare Center pages; embassy hospital lists

Common mistakes to avoid

Going straight to a big university hospital for a minor issue — you pay a much higher co-pay share and usually need a clinic referral first; start at a local 의원.
Assuming you can decline NHIS because you have private/international insurance — enrollment is mandatory after 6 months and runs in parallel; you still owe the premium.
Letting the local-subscriber premium bill go unpaid (e.g. ignoring Korean-language mail), which builds arrears that can block your visa extension.
Expecting to buy antibiotics or prescription meds over the counter — Korea separates prescribing and dispensing, so you need a doctor's prescription taken to a pharmacy (약국).