California Code
CHAPTER 1 - General Provisions
Section 3211.

3211. “Insurer” includes the State Compensation Insurance Fund and any private company, corporation, mutual association, reciprocal or interinsurance exchange authorized under the laws of this State to insure employers against liability for compensation and any employer to whom a certificate of consent to self-insure has been issued.

(Enacted by Stats. 1937, Ch. 90.)