Your HRM will help secure the medical visa invitation letter from the hospital that you have decided to proceed with. To be able to issue the visa invitation letter, the hospital requires a copy of the passports for the patient and the attendant, which should have a validity of at least six months from the date of travel. For a medical visa to Turkey for a critical surgery, you may even be asked to submit a proof of funds transfer to the hospital as a part of the application process.