The Interim Fee Reference Guide provides all current interim fees. Interim fees are established in certain circumstances with approval from the Department of Health and Wellness. When a health service code is assigned to an interim fee, it is published in the MSI Physician’s Bulletin, and the Interim Fee Reference Guide. If an interim fee is terminated or made permanent, it will be removed from the reference guide and updated in the MSI Physician’s Bulletin and/or Physician’s Manual as applicable.