Tex. Ins. Code § 1201.221
An individual accident and health insurance policy must contain one of the following provisions if the policy addresses the subject matter of the provision:
"Other Insurance With This Insurer: If an accident or health or accident and health policy or policies previously issued by the insurer to the insured is in force concurrently with this policy, making the aggregate indemnity for __________ (insert types of coverages) in excess of $__________ (insert maximum limit of indemnity or indemnities), the excess insurance is void and all premiums paid for the excess shall be returned to the insured or to the insured's estate."
"Other Insurance With This Insurer: Insurance effective at any one time on the insured under the same type of policy or policies with this insurer is limited to the one policy elected by the insured, the insured's beneficiary, or the insured's estate, as the case may be, and the insurer will return all premiums paid for all other policies of the same type."
Tex. Ins. Code § 1201.221