If you have an existing EHIC, it will remain valid until the expiry date on the card. You can apply for a new card up to 6 months before your current card expires.
It’s currently taking longer than usual to process new UK EHIC and GHIC applications due to high demand. We’re working to resolve this and will process all applications as soon as possible. If you need emergency treatment while you’re visiting another country and haven’t received your card, you can apply for a Provisional Replacement Certificate (PRC).