C-3-6 (Preferred-Company Invited Business) Korea Visa Guide | 2026

1. What C-3-6 Is

C-3-6 covers those invited by an enterprise or organisation selected as a preferred company. It sits alongside the other business routes in the short-term visit family: C-3-4 일반상용 for ordinary business visits, and C-3-5 for business visits made under an international agreement. The advantage of this code is the standing of the inviting company, which is what the designation exists to recognise.

2. Eligibility Checklist

• Declared purpose fits current C-3-6 medical-visit scope.
• Treatment-related invitation/appointment records are valid.
• Funding and stay-duration evidence is sufficient and consistent.
• Return-intent evidence supports short-stay profile.
• No unresolved immigration-history issues affecting credibility.

3. Criteria Summary

• C-3-6 is not points-based.
• Review is purpose-document and credibility driven.
• Medical-purpose evidence must match itinerary and funding records.
• Purpose drift toward non-permitted activity is a key refusal signal.

4. Salary and Contract Rules

• C-3-6 is not salary-floor or employment-contract based.
• Financial capability for treatment and stay is central.
• Sponsor/support claims should be evidenced and internally consistent.
• Conflicting payment/support records can trigger refusal risk.

5. Employer and Workplace Change Rules

• C-3-6 is a temporary visit status, not an employment category.
• Permitted activity scope is limited to declared visit purpose.
• Unauthorized work/activity can impact current and future applications.
• Maintain clear itinerary and institutional contact records.

6. Required Documents

• Visa application form, passport, photo, and fee proof.
• Medical invitation/appointment and treatment-supporting documents.
• Funding/sponsor evidence for treatment and stay costs.
• Accommodation/itinerary and return-related evidence.
• Any additional documents requested by reviewing mission/office.

7. Fees and Processing

• Fees follow current short-stay issuance schedules.
• Processing varies by consulate and case completeness.
• Supplement requests are common in evidence-light files.
• Apply with consistent purpose and timeline documents.

8. Common Rejection Reasons

• Purpose does not satisfy C-3-6 scope.
• Medical invitation/treatment evidence is weak or inconsistent.
• Funding or sponsor documents are insufficient.
• Short-stay intent is not credibly established.
• Material contradictions exist across core records.

9. FAQ