Each participating Compact state sends two representatives to the Interstate Medical Licensure Compact Commission. These commissioners must be either a physician member of a medical or osteopathic physician licensing board, a public member of such a board, or an executive director or administrator of such a board.
If a state has only one medical board, then both commissioners must come from that board. But if it has two boards -- a medical board and an osteopathic board -- then each board gets one seat.