The Department shall make Medicaid enhancement payments to Tier I and Tier II academic medical centers as defined in Section 5-5e.2 of this Code identified as primary affiliates by any university or college that makes a donation to the Medicaid Research and Education Support Fund. The Department may enhance Medicaid physician services for physicians employed by Tier I or Tier II academic medical centers as defined in Section 5-5e.2 of this Code qualified to receive payment under this Section if the Department and the Tier I or Tier II academic medical centers as defined in Section 5-5e.2 of this Code agree prior to the start of the State fiscal year for which payments are made.