Cal. Code Regs. tit. 10 § 2232.52
These regulations do not require the use of overinsurance provisions in group disability policies or group non-profit hospital service plan contracts. If, however, such a policy or contract contains overinsurance provisions, such provisions must be consistent with and no less favorable than the Standard Group Coordination of Benefit Provisions and Instructions herein established. To this end, overinsurance provisions, or provisions for the reduction of benefits otherwise payable because of other insurance by whatever name designated, which are less favorable than the Standard Coordination of Benefit Provisions herein contained may not be used, except that plans of coverage designated to be supplementary over the policyholder's underlying basic plan of coverage may provide that its coverage shall be excess to that specific policyholder's plan of basic coverage from whatever source provided. (See Section 2232.35 of Article 2a supra.)
Cal. Code Regs. Tit. 10, § 2232.52
Note: Authority cited: Sections 10270.94, 10270.98, 11515 and 11515.5, Insurance Code. Reference: Sections 10270.98 and 11515.5, Insurance Code.