"If, at any point in time, a dependent child is covered by the health, hospital, or dental insurance plans of both parents, the health, hospital, or dental insurance plan of (Parent's Name) shall be primary coverage for the dependent child and the health, hospital, or dental insurance plan of (Other Parent's Name) shall be secondary coverage for the dependent child. If a parent remarries and his or her dependent child is not covered by that parent's health, hospital, or dental insurance plan but is covered by a step-parent's plan, the health, hospital, or dental insurance plan of the step-parent shall be treated as if it is the plan of the remarried parent and shall retain the same designation as the primary or secondary plan of the dependent child."
Utah Code § 30-3-5.4