In cases such as sudden sicknesses during trips and you receive treatment without your My Number Card or Eligibility Verification Certificate, etc., you must pay the entire medical care costs on your own. However, you can apply to the Health Insurance Society at a later date and get a reimbursement. This is called "Medical Care Expenses."
The reimbursement is an amount equivalent to 70% of the amount calculated on the basis of treatment methods and costs recognized by the health insurance. In this case, the amount paid may not necessarily be 70% of the actual cost of the full course of treatment.
Please make sure to obtain a receipt and medical cost details; these are required when applying for Medical Care Expenses.