This chapter does not apply to a nonprofit corporation that:
(1) Individually self-insures for property and liability risks;
(2) Participates in a risk pooling arrangement, including a risk retention group or a risk purchasing group, regulated under chapter 48.92 RCW, or is a captive insurer authorized in its state of domicile;
(3) Comprises only units of local government or is a group that comprises local governments joined by an interlocal agreement authorized by chapter 39.34 RCW; or
(4) Is a hospital licensed under chapter 70.41 RCW, or an entity owned, operated, controlled by, or affiliated with such a hospital that participates in a self-insurance risk pool or other risk pooling arrangement.