Medical insurance has reviewed and reimbursed. The hospital has written off means that the medical insurance has reviewed and reimbursed it. The written off here means that it has reviewed and reimbursed. It has been reimbursed and can no longer be reimbursed. If the hospitalization medical expenses are not written off by social security, it means that the calculation has not been approved by local medical insurance. Write-off means writing off accounts, which means reducing bad debts.