Medical certificate
A medical certificate is issued by a licensed physician on the basis of an actual examination. It supports sick leave, visa files, employment, driving licence applications and submissions abroad, and must state the doctor's name, licence number and the date of examination.
In Thailand a medical certificate may only be issued by a physician licensed by the Medical Council of Thailand, and its content must match what the doctor actually observed on the date of examination. Issuing a certificate that does not reflect the facts is a professional-ethics violation and may carry legal liability, so applicants should not ask a doctor to state more than was examined.
Requirements differ by receiver. Some accept a short statement that no condition preventing work was found; others require named tests such as a chest X-ray or blood work; others supply their own form that the doctor must complete and sign directly. Checking the receiver's form before the appointment avoids a repeat examination.
For use abroad, a Thai-language certificate is translated into the language the receiver requires and the translation is legalised by the Legalisation Division of the Department of Consular Affairs. Many embassies additionally ask for the doctor's signature, or a certified copy, to be attested by a Notarial Services Attorney beforehand.
A certificate the hospital issues in English still goes through legalisation when the receiver wants a state-attested document, because consular legalisation attests the signature and seal of the issuer or the accuracy of the translation — never the medical content itself.
Documents to prepare
- The original medical certificate signed by the physician, showing the medical licence number
- National ID card or passport of the person examined, with the name spelled as in the travel document
- The receiver's own form, if any, together with a translation of the fields to be completed
- Attached results such as X-ray reports or blood tests where the receiver requires them
- A power of attorney if someone else will handle the legalisation steps
Step order
- Check the receiver's requirements: which tests and which form
- Attend the examination and obtain the original certificate from the healthcare facility
- Translate into the required language and check the name spelling against the passport
- Have the signature or a copy attested by a Notarial Services Attorney where required
- File for translation legalisation at the Department of Consular Affairs
- Obtain the destination embassy's endorsement where that country requires it
Pre-filing checklist
- The name matches the passport letter for letter
- The signing doctor's medical licence number appears on the document
- The examination date is stated and still within the receiver's validity window
- The facility's seal appears on the original
- The wording covers every point the receiver asked for, with nothing omitted
Practical tips
- Ask for more than one original on the day of the examination; obtaining one later usually means being examined again
- Scan or photograph the document before handing any original to a receiver, so you have a reference if a reissue is needed
- If the receiver supplies a form, have the doctor complete that form directly rather than substituting the hospital's own template
- Confirm whether validity runs from the examination date or the issue date, and schedule the visa appointment accordingly
Common pitfalls
- A certificate without the doctor's licence number is frequently refused at legalisation or at the embassy
- Asking a doctor to state more than was examined creates risk for both the doctor and the applicant
- Submitting an uncertified copy to an embassy forces the whole chain to be restarted
- A self-made translation is not accepted for consular certification of the translation
- Letting the document expire while waiting for an embassy slot means repeating the examination
Frequently asked questions
Can a Thai medical certificate be used abroad as it is?
Usually not. It must be translated into the required language and the translation legalised by the Department of Consular Affairs; many countries then require endorsement by their embassy in Bangkok.
How long is a medical certificate valid?
Thai law sets no general validity period — the receiver decides. Many bodies accept only certificates issued within 30 days of examination, so check before booking the appointment.
The hospital issued it in English. Is translation still needed?
No translation is needed if the receiver accepts English, but legalisation is still required where the receiver wants a state-attested document, since legalisation concerns the signature and seal rather than the language.
Can someone else collect the certificate for me?
Health data is confidential under section 7 of the National Health Act B.E. 2550 and sensitive data under the PDPA, so facilities normally release it only to the patient or to a representative with a written power of attorney and both parties' ID copies.
Is a certificate from a small clinic acceptable for a visa?
It can be, provided the signer is a licensed physician and the clinic is properly registered — but some embassies publish a list of accepted hospitals, so check that notice first.
What if the name is spelled differently from my passport?
Have the issuing facility correct it before translation and legalisation. It cannot be fixed at the translation stage, because the translation must mirror the original.
Does a Notarial Services Attorney have to attest it?
It depends on the receiver. The common cases are a request for a certified true copy or for the signer's signature to be attested before the consular step.
Can one certificate serve both a driving licence and a visa application?
It is better not to reuse one. The required wording differs, so tell the doctor the purpose at the examination so the text matches the intended use.
For a document review before you file, contact us on LINE @nycli, call +66-83-249-4999 or email nycli@ilc.ltd. Our team will confirm the steps, any missing documents and a realistic timeline for your case.