Montana Title 33. Insurance and Insurance Companies § 33-18-215. Postclaim underwriting prohibited--condition

An insurer, health service corporation, or health maintenance organization may not place an elimination rider on or rescind coverage provided by a disability policy, certificate, or subscriber contract after a policy, certificate, or contract has been issued unless the insured has made a material misrepresentation or fraudulent misstatement on the application or has failed to pay the premium when due.