Open Tender Procedure, Pursuant To Art. 71 Of Legislative Decree 36/2023, In A Single Lot, Through The Purchasing Platform Https://Anci.Acquistitelematici.It, For The Conclusion Of A Framework Agreement With A Single Economic Operator, Pursuant To Art. 59, Paragraph 3, Of Legislative Decree 31 March 2023, N. 36 For The Awarding Of The Insurance Service “Medical Expense Reimbursement”