Manufacturer and insurer disclosure of prescription drug costs. The bill requires that a manufacturer of a prescription drug whose wholesale acquisition cost exceeds $40 notify certain purchasers of the drug, including the state, health insurers, and pharmacy benefit managers doing business in Wisconsin, when the cost for a course of therapy increases by more than 16 percent. The bill requires that an insurer issuing health insurance coverage in this state annually file a report with OCI that identifies which of the plan’s covered drugs have the highest prescription rates and costs and, for large group plans, provides information about the relationship between prescription drug costs and premium rates.