Mont. Code Ann. § 33-30-1101

A hospital or medical service plan contract issued by a health service corporation may contain a provision providing that, to the extent necessary for reimbursement of benefits paid to or on behalf of the insured, the health service corporation is entitled to subrogation, as provided for in 33-30-1102, against a judgment or recovery received by the insured from a third party found liable for a wrongful act or omission that caused the injury necessitating benefit payments.