A joint self-insurance program approved in accordance with this chapter is exempt from insurance premium taxes, fees assessed under chapters 48.02, 48.32, and 48.32A RCW, business and occupation taxes imposed under chapter 82.04 RCW, and any assigned risk plan or joint underwriting association otherwise required by law. This section does not apply to or provide exemptions for insurance companies issuing policies to cover program risks and third-party administrators or insurance producers serving the joint self-insurance program.