California Code, Insurance Code - INS § 381.5

(a) Every policy issued, amended, delivered, or renewed in this state shall provide coverage for the registered domestic partner of an insured or policyholder that is equal to, and subject to the same terms and conditions as, the coverage provided to a spouse of an insured or policyholder. A policy may not offer or provide coverage for a registered domestic partner if it is not equal to the coverage provided for the spouse of an insured or policyholder. This subdivision applies to all forms of insurance regulated by this code.

(b) A policy subject to this section that is issued, amended, delivered, or renewed in this state on or after January 1, 2005, shall be deemed to provide coverage for registered domestic partners that is equal to the coverage provided to a spouse of an insured or policyholder.

(c) It is the intent of the Legislature that, for purposes of this section, “terms,” “conditions,” and “coverage” do not include instances of differential treatment of domestic partners and spouses under federal law.