Moving to Thailand with Overseas Medical Records: What Expats Should Know About Health Insurance

Moving to Thailand does not erase your medical history. Even if you have never visited a hospital in Thailand, an insurer may still consider illnesses, symptoms, medication and treatment received in another country when assessing your application or a future claim.

The important issue is not whether your records were created in Thailand. It is whether you disclosed your medical history accurately and whether the treatment you later claim is covered under your policy.

Can you apply without Thai medical records?

In many cases, yes. Foreign residents can apply for health insurance in Thailand even when all their previous medical records are overseas. For a broader overview of how health insurance works for long-stay expats generally, see our health insurance guide for expats in Thailand.

Depending on the insurer, your age, health and chosen plan, you may be asked to complete a medical questionnaire or provide additional information. This could include:

• Previous diagnoses
• Current medication
• Past surgery or hospital treatment
• Ongoing symptoms or medical investigations
• Doctor reports or test results
• Details of earlier insurance claims

The insurer may accept the application normally, apply an exclusion, charge an additional premium, request further evidence or decline the application. The outcome depends on the insurer's underwriting rules and the individual case.

What counts as a pre-existing condition?

A pre-existing condition generally means a medical condition, illness, injury or symptom that existed before the policy began.

It may include a condition that was previously diagnosed, an ongoing course of treatment or symptoms experienced before applying—even when treatment has not yet started.

Coverage varies considerably between insurers and policies. Some plans exclude pre-existing conditions, while another insurer may consider certain conditions after reviewing a complete medical declaration. LUMA advises applicants to disclose their medical history and obtain the insurer's acceptance terms before purchasing a policy. For a fuller walkthrough of how insurers generally handle this, see our guide to key questions before buying health insurance in Thailand.

Source: https://www.lumahealth.com/blog/exclusions/

Why full disclosure matters

Leaving information out of an application can create problems later.

When assessing a claim, an insurer may compare the claimed condition with the information supplied during the application. It may also request reports from doctors who treated you before you moved to Thailand.

Answer every medical question truthfully and completely. If you are unsure whether an old illness, symptom, injury or medication is relevant, disclose it and ask the insurer to confirm its decision in writing.

Do not rely only on a verbal explanation from a salesperson. Keep copies of:

• Your completed application
• Medical declaration
• Insurance certificate
• Policy wording
• Schedule of benefits
• Written exclusions or special conditions
• Emails confirming what the insurer accepted

Your policy documents—not a general advertisement—determine what is covered.

Documents to prepare before moving

Collecting records before leaving your home country may make future applications and claims easier. If you're still working through the broader relocation process, see our complete guide to retiring in Thailand.

Consider keeping digital copies of:

• A summary from your regular doctor
• Current prescriptions and medication names
• Specialist reports
• Recent laboratory or imaging results
• Hospital discharge summaries
• Vaccination records
• Previous insurance information
• Receipts and invoices connected with ongoing treatment

Save these documents securely and make sure they are readable. If they are not in English or Thai, ask the insurer whether a certified translation will be required.

Having these records does not guarantee that a claim will be approved, but it can help the insurer understand your medical history and process requests more efficiently.

What may happen when you make a claim?

The process depends on the policy, hospital and type of treatment.

For treatment within an insurer's direct-billing network, the hospital may request approval before providing non-emergency treatment. For reimbursement claims, you may need to pay first and submit documents afterward.

Supporting documents can include:

• A completed claim form
• Medical report or diagnosis
• Itemised hospital invoice
• Official receipt
• Prescription
• Test results
• Proof of payment
• Additional medical history requested by the insurer

International insurers commonly require claim forms and supporting medical and payment documents.

Source: https://www.allianzcare.com/content/dam/onemarketing/azcare/allianzcare/en/docs/DOC-IBG-CARE-UK-EN-1125.pdf

Ask your insurer about pre-authorisation before planned admission, surgery, expensive tests or specialist treatment. Requirements and deadlines differ between policies.

Questions to ask before buying a policy

Before paying for coverage, ask the insurer or broker:

• How does this policy define a pre-existing condition?
• Are any conditions excluded from my coverage?
• Is there a waiting period?
• Do you need my overseas medical records now?
• What documents would be required when making a claim?
• Which hospitals offer direct billing?
• Is pre-authorisation required for planned treatment?
• What geographic area does the policy cover?
• Are outpatient care, medication and follow-up treatment included?
• Will exclusions and special conditions appear in writing?

Request written answers and compare them with the final policy documents.

The practical takeaway

You do not normally need to build a new medical history in Thailand before exploring health-insurance options. However, your previous medical history remains relevant wherever the records were created.

The safest approach is to:

• Disclose your medical history accurately
• Preserve your overseas medical documents
• Read the policy wording and exclusions
• Obtain important answers in writing
• Confirm claim and pre-authorisation procedures before treatment

Insurance terms differ by provider and can change. Always review the current policy documents and obtain personalised confirmation from the insurer or a licensed insurance professional before purchasing coverage or arranging treatment.

This article provides general information only. It is not medical, legal or insurance advice and does not guarantee eligibility, coverage or claim approval.