The Irish government has said it will, if necessary, cover the cost of European Health Insurance Cards (EHIC) for citizens in NI after Brexit.
Tanaiste (Irish deputy PM) Simon Coveney made the remark in the Dail (Irish Parliament) on Tuesday.
If the UK leaves with no deal, EHICs issued in the UK will not be valid.
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Taoiseach Leo Varadkar previously said he wanted it to be retained post-Brexit for people in Northern Ireland.
The UK is trying to reach agreements with EU governments to extend the reciprocal health care arrangements.
Mr Coveney said the Irish government was working to ensure it could be extended for people in Northern Ireland and added that because they would no longer be resident in the EU, it would “pose challenges”.
He also said it would mean having to pass legislation in the Dail.
“When EU citizens travel across the EU they have health insurance cover,” Mr Coveney said.
“We are working and will ensure that we extend that right to Northern Ireland
“That will involve passing legislation here and it will involve the Irish government if necessary paying for that insurance cover for citizens in Northern Ireland.”
He added that he wanted to ensure citizens in Northern Ireland could continue to access the Erasmus programmes after Brexit.
The Erasmus scheme is an EU programme that helps students study in other countries.
The tanaiste said that he recognised the uncertainty about Brexit had caused concern about future arrangements, but that nothing changed the position that Irish citizens in Northern Ireland “continue to be EU citizens”.
Anyone born in Northern Ireland has the right to identify as Irish or British or both, thanks to the Good Friday Agreement, a peace deal signed in April 1998 by the British and Irish governments and Northern Ireland’s political parties.
In a statement, the Irish Department of Foreign Affairs said that “in order to fully uphold the spirit of the Good Friday Agreement, where issues arise with the UK exit from the EU, these should be addressed in a way that avoids any difference in entitlements based on citizenship in Northern Ireland”.