with a description of clearly defined treatments that are considered alternatives to opioids to be applied for purposes of subsection (a). (d) Incentive payment Under the demonstration project, the Secretary shall create a payment structure under which hospitals participating in the demonstration project that increase the use of alternatives to opioids and decrease the use of opioids may receive a shared savings bonus in addition to what would otherwise be made for items and services furnished under subsection (a). The amount of such shared savings shall be based on the difference between readmission rates for individuals treated with an alternative to opioids at the emergency department of the participating hospital and the average rate of readmissions for individuals treated with opioids and discharged from a representative group of emergency departments of hospitals not participating in the demonstration project in the same region as the participating hospital over a period of five years. (e) Clarification Nothing under this section shall prevent a health care provider from prescribing an opioid if an opioid is a medically necessary treatment. (f) Reports to Congress (1) Initial report Not later than 180 days after the date of the enactment of this Act, the Secretary shall submit to Congress a report that includes— (A) the application form described in subsection (b)(4)(A) that is to be made available to potential participants