A lien is the legal right to repayment. Liens are established in motor vehicle cases in a few different ways. First, some medical providers establish liens to protect their right to the payment of outstanding medical bills from the settlement of a personal injury case. Second, personal health insurance companies establish liens to allow them to be reimbursed for any payments made for medical treatment in a motor vehicle accident case. Third, certain public benefits paid to motor vehicle accident victims may be recovered through liens. In all cases, Massachusetts law establishes procedures and rights of lien holders. If applicable, a lien reduces the amount of damages an accident victim receives.