Mont. Code Ann. § 33-1-1102

Notwithstanding any other provision of law and except as provided in this part, any person or other entity that provides coverage in this state for medical, surgical, chiropractic, physical therapy, speech-language pathology, audiology, professional mental health, dental, hospital, or optometric expenses, whether such coverage is by direct payment, reimbursement, or otherwise, is presumed to be subject to the jurisdiction of the department unless the person or other entity shows that while providing such services it is subject to the jurisdiction of another agency of this or another state or any subdivision thereof or the federal government.