Mont. Code Ann. § 39-51-2406

The department shall have continuing jurisdiction over all claims filed for benefits to revise, modify, alter, cancel, and amend all orders, findings, and determinations made therein at any time and shall not lose such jurisdiction unless and until the jurisdiction of such claim and subject matter thereof has been taken by a court of competent jurisdiction in a proceedings filed therein as provided for in subsections (2) through (6) of 39-51-2410.