Explanation of Waiver Codes: The waiver numbers are assigned by the Centers for Medicare and Medicaid just to have a distinct tracking system for all the waivers across the country. The numbers don\\\\\\'t mean much except that if there is an \\\\\\\"R\\\\\\\" as in R1, that means the waiver has been Renewed. The most important part are the letters that are shown in a separate column on the table. They identify which population is served by the waiver. Here\\\\\\'s what they mean: PD = persons with physical disabilities MR/DD = persons with mental retardation or developmental disabilities A/D = aged persons or younger persons with disabilities AIDS/ARC = persons with AIDS or AIDS related conditions TechnDep = persons with technology dependencies TBI = persons with Traumatic Brain Injury MI = persons with mental illness (a rarely used waiver) All = a single waiver that serves all persons with disabilities