Montana Title 33. Insurance and Insurance Companies § 33-22-514. Preexisting conditions relating to group market

(a) medical advice, diagnosis, care, or treatment was recommended or received by the participant or beneficiary within the 6-month period ending on the enrollment date;

(b) exclusion of coverage extends for a period of not more than 12 months or 18 months in the case of a late enrollee; and

(c) the period of the preexisting condition exclusion is reduced by the aggregate of the periods of creditable coverage applicable to the participant or beneficiary as of the enrollment date.