Iowa Code § 272.4
1. Members, except for the director of the department of education or the director’s designee, shall be appointed to serve staggered terms of four years. A member shall not serve more than two consecutive terms, except for the director of the department of education or the director’s designee, who shall serve until the director’s term of office expires. A member of the board, except for the two public members and the director of the department of education or the director’s designee, shall hold a valid practitioner’s license during the member’s term of office. A vacancy exists when any of the following occur:
89 Acts, ch 265, §4 CS89, §260.4 92 Acts, ch 1212, §25 C93, §272.4 2007 Acts, ch 22, §64; 2008 Acts, ch 1008, §4