Entry Requirements: Visa-Free Travel, K-ETA, and the Medical Tourism Visa

U.S. citizens can enter South Korea visa-free for tourism or business for stays of 90 days or less. A same-day or few-day checkup at a local clinic falls comfortably inside that window — most visitors on this site won't need to apply for anything beyond a valid passport.

K-ETA (Korea's electronic travel authorization) is currently waived for U.S. passport holders through December 31, 2026. In its place, you're required to submit the e-Arrival Card online within 72 hours before landing — a shorter form than K-ETA, but not optional. Starting January 1, 2027, U.S. travelers are expected to need K-ETA again for visa-free short stays, so check the current rule close to your travel date rather than assuming this page stays accurate forever.

The C-3-3 exists for a different situation: longer or more involved treatment where a Korean medical institution formally sponsors your visit. It requires an invitation letter from a hospital registered for international patient services (through KTO or KHIDI), confirmation of your appointment, and proof you can cover the cost of treatment and your stay.

Not every clinic can issue this invitation — only institutions registered for international-patient treatment can. If your plan is a single local-clinic checkup within a short trip, you likely don't need this path at all. If you're pursuing a longer or more complex treatment, ask the clinic directly whether they're registered to sponsor a C-3-3 before you rely on it.

This isn't immigration advice, and visa rules change. For anything beyond a short visa-free visit, confirm directly with the Korean embassy or consulate serving your area, or with the clinic itself if they're sponsoring a C-3-3.