Cal. Ins. Code § 10369.4
A disability policy may contain a provision which shall, at the option of the insurer, be in one of the two forms set forth herein. If Form A is used, there shall be inserted in the first blank the type of coverage or coverages and in the second blank the maximum limit of indemnity or indemnities.
Form A.
Other Insurance in This Insurer: If an accident or sickness or accident and sickness policy or policies previously issued by the insurer to the insured be in force concurrently herewith, making the aggregate indemnity for ____ in excess of $____, the excess insurance shall be void and all premiums paid for such excess shall be returned to the insured or to his estate.
Form B.
Other Insurance in This Insurer: Insurance effective at any one time on the insured under a like policy or policies in this insurer is limited to the one such policy elected by the insured, his beneficiary or his estate, as the case may be, and the insurer will return all premiums paid for all other such policies.
Ca. Ins. Code § 10369.4