Indiana Code Title 27. Insurance § 27-8-15-27

(1) The benefits provided by a plan to an eligible employee enrolled in the plan may not be excluded, limited, or denied for more than nine (9) months after the effective date of the coverage because of a preexisting condition of the eligible employee, the eligible employee's spouse, or the eligible employee's dependent.

(2) The plan may not define a preexisting condition, rider, or endorsement more restrictively than as a condition for which medical advice, diagnosis, care, or treatment was recommended or received during the six (6) months immediately preceding the effective date of enrollment in the plan.