Cal. Health and Safety Code § 1374.19

(a) This section shall only apply to a health care service plan covering dental services or a specialized health care service plan contract covering dental service pursuant to this chapter. (b) For purposes of this section, the following terms have the following meanings: (1) “Coordination of benefits” means the method by which a health care service plan covering dental services or a specialized health care service plan contract, covering dental services, and one or more other health care service plans, specialized health care service plans, or disability insurers, covering dental services, pay their respective reimbursements for dental benefits when an enrollee is covered by multiple health care service plans or specialized health care services plan contracts, or a combination thereof, or a combination of health care service plans or specialized health care service plan contracts and disability insurers. (2) “Primary dental benefit plan” means a health care service plan or specialized health care service plan contract regulated pursuant to this chapter or a dental insurance policy issued by a disability insurer regulated pursuant to Part 2 (commencing with Section 10110) of Division 2 of the Insurance Code that provides an enrollee or insured with primary dental coverage. (3) “Secondary dental benefit plan” means a health care service plan or specialized health care service plan contract regulated pursuant to this chapter or a dental insurance policy issued by a disability insurer regulated pursuant to Part 2 (commencing with Section 10110) of Division 2 of the Insurance Code that provides an enrollee or insured with secondary dental coverage. (c) A health care service plan covering dental services or a specialized health care service plan issuing a specialized health care service plan contract covering dental services shall declare its coordination of benefits policy prominently in its evidence of coverage or contract with both enrollee and subscriber. (d) When a primary dental benefit plan is coordinating its benefits with one or more secondary dental benefits plans, it shall pay the maximum amount required by its contract with the enrollee or subscriber. (e) A health care service plan covering dental services or a specialized health care service plan contract covering dental services, when acting as a secondary dental benefit plan, shall pay the lesser of either the amount that it would have paid in the absence of any other dental benefit coverage, or the enrollee’s total out-of-pocket cost payable under the primary dental benefit plan for benefits covered under the secondary plan. (f) Nothing in this section is intended to conflict with or modify the way in which a health care service plan covering dental services or a specialized health care service plan covering dental services determines which dental benefit plan is primary and which is secondary in coordinating benefits with another plan or insurer pursuant to existing state law or regulation.