(a) “Employee” means:
(1) An officer or employee of the state or of any agency, department, authority, or instrumentality of the state, including the University of California.
(2) An employee who is employed by a contracting agency, including, but not limited to, an officer or official of a contracting agency if the officer or official participates in the retirement system provided by the employer.
(3) An annuitant receiving a retirement allowance pursuant to Section 21228 who is employed by a contracting agency.
(4) A teaching associate, lecturer, coach, or interpreter employed by the California State University who is appointed to work in an academic year classification for at least six weighted teaching units for one semester, or for at least six weighted teaching units for two or more consecutive quarter terms. This paragraph does not apply to a state member employed by the California State University, unless provided for in a memorandum of understanding reached pursuant to Chapter 12 (commencing with Section 3560) of Division 4 of Title 1 or authorized by the Trustees of the California State University for employees excluded from collective bargaining.
(5) All employees in job classes specified in subdivision (a) of Section 14876.
(b) Except as otherwise provided by this part, “employee” does not include any of the following:
(1) A person employed on an intermittent, irregular, or less than half-time basis, or an employee similarly situated.
(2) A National Guard member described in Section 20380.5.