USA Business Visa (B-1) — Medical Treatment (For Thai Applicants)

Last Updated on October 24, 2025 by 28 Immigration

A) Core Application Requirements (Mandatory for Everyone)

  1. DS-160 Form (Online Application)
    • Fill at ceac.state.gov.
    • Upload a compliant U.S. visa photo.
    • Print DS-160 confirmation page with barcode.
  2. Visa Appointment (USTravelDocs)
    • Create profile at ustraveldocs.com/th.
    • Pay MRV visa fee (~USD 185, in Thai Baht).
    • Book appointment at U.S. Embassy Bangkok or U.S. Consulate Chiang Mai.
    • Print appointment confirmation page.
  3. Passport (Original + Copies)
    • Valid at least 6 months beyond intended stay in the U.S.
    • At least two blank pages.
    • Include old passports with prior visas/travel.
  4. Photograph
    • Size: 2×2 inches (51×51 mm), color, white background, no glasses.
    • Upload electronically and bring 1 printed copy.
  5. Visa Fee Receipt
    • Proof of MRV payment.

B) Medical-Specific Supporting Documents

1. Medical Diagnosis in Thailand

  • Letter from treating physician or hospital in Thailand stating:
    • Nature of the medical condition.
    • Why treatment is required.
    • Why the treatment cannot be fully provided in Thailand.
    • Recommendation to seek treatment in the United States.

2. U.S. Hospital/Doctor Documentation

  • Letter from U.S. hospital or doctor confirming:
    • Willingness to treat the applicant.
    • Details of proposed treatment plan.
    • Estimated duration of treatment.
    • Estimated cost of treatment (consultation, hospital stay, procedure, etc.).

3. Proof of Ability to Pay for Treatment & Travel

  • Financial evidence showing coverage of medical expenses + living costs:
    • Bank statements (3–6 months).
    • Savings/fixed deposits.
    • Insurance documents (if international coverage).
    • Proof of sponsor’s finances (if a family member or organization will pay).
  • Affidavit of Support (Form I-134) (optional but helpful if sponsored by a U.S. family member).

4. Arrangements in the U.S.

  • Evidence of accommodation during treatment (hotel, hospital lodging, or staying with relatives).
  • If staying with family/friends: letter of support + copy of their ID/Green Card/passport.

C) Additional Supporting Documents (Standard B1)

  • Employment documents (if applicable):
    • Employment verification letter (position, salary, leave approval).
    • Recent payslips.
  • Business ownership (if self-employed):
    • Business registration certificate, tax filings.
  • Family/social ties in Thailand:
    • Marriage certificate, birth certificates of children.
    • House registration (Tabien Baan).
    • Property deeds or land ownership.
    • Vehicle registration.
    • Investments (stocks, funds, bonds).
  • Previous travel history:
    • Copies of visas (U.S., Schengen, UK, Japan, Korea).
    • Stamps showing compliance with return.

D) Embassy Interview Preparation

  • Officers will focus on:
    • Medical necessity: Is treatment required in the U.S.?
    • Financial ability: Can you afford the treatment and living expenses?
    • Ties to Thailand: Will you return after treatment?
  • Common questions:
    • What is your medical condition?
    • Why do you need treatment in the U.S.?
    • Which doctor/hospital will treat you?
    • How much will the treatment cost?
    • Who will pay for your treatment and trip?
    • What ties do you have to Thailand?

E) Pre-Interview Checklist

✅ DS-160 confirmation page.
✅ Appointment confirmation page.
✅ Passport (valid 6+ months).
✅ 2×2 inch photo.
✅ MRV fee receipt.
✅ Medical diagnosis letter from Thai doctor.
✅ Letter from U.S. hospital/doctor (treatment plan + cost estimate).
✅ Financial proof (bank statements, insurance, sponsor’s finances).
✅ Proof of accommodation in U.S. (hotel, hospital, family residence).
✅ Employment or business documents (if applicable).
✅ Family ties in Thailand (marriage, children, property).
✅ Previous visas and travel history.