A health insurance card or document proving enrollment in health insurance; presenting it at medical facilities allows insurance coverage to apply.
初めて病院に行くときは保険証を必ず持って行ってください。
Be sure to bring your insurance card when you go to the hospital for the first time.
引っ越しの際は保険証の住所変更を忘れないでください。
Don't forget to change the address on your insurance card when you move.
子どもの保険証は学校に提出する必要があることがある。
Sometimes you need to submit your child's insurance card to the school.