Article 26 7.

If the insured person has actually borne all or part of the costs for the authorised medical treatment him or herself and the costs which the competent institution is obliged to reimburse to the institution of the place of stay or to the insured person according to paragraph 6 (actual cost) are lower than the costs which it would have had to assume for the same treatment in the competent Member State (notional cost), the competent institution shall reimburse, upon request, the cost of treatment incurred by the insured person up to the amount by which the notional cost exceeds the actual cost. The reimbursed sum may not, however, exceed the costs actually incurred by the insured person and may take account of the amount which the insured person would have had to pay if the treatment had been delivered in the competent Member State.