insurance card
Commonly refers to a health insurance card (健康保険証) in everyday contexts, but can denote any insurance certificate.
病院に行くときは保険証を持って行ってください。
Please bring your insurance card when you go to the hospital.
保険証をなくしたので、再発行してもらった。
I lost my insurance card, so I had it reissued.
I showed my insurance card at the hospital reception desk.
Please bring your insurance card when you come in for an examination.
I forgot my insurance card today and had to pay the full cost myself.
I went to city hall to renew my insurance card.