When does the Health Insurance card expire?

It expires on Decemeber 31 of each year if the owner does not renew his/her membership to the NHS.

The expiry date printed on the card is a general expiry date which is not connected to the actual membership.

Each card, basically usually expires after 4 years from the issuing but it is only valid if the owner has paid for the yearly coverage and done all steps of the renewal process.