EHIC or Provisional Replacement Certificate (PRC) can be used in another Member State of the European Union (EU), European Economic Area countries (EEA - Iceland, Liechtenstein, Norway) or in Switzerland.

Yes. EHIC or PRC can be used in the same manner regardless of whether you are staying in another Member State of the EU, EEA countries or Switzerland on private business, attending college, business trip, temporary work to which you have referred by your employer or other reason.

In this case, you need to request from your competent institution for health insurance a refund for the amount paid.