Louisiana Revised Statutes Tit. 22, § 867. Must contain entire contract with exceptions

A. No agreement in conflict with, modifying, or extending the coverage of any contract of insurance shall be valid unless it is in writing and physically made a part of the policy or other written evidence of insurance, or it is incorporated in the policy or other written evidence of insurance by specific reference to another policy or written evidence of insurance. This Section shall not apply to contracts as provided in Subpart C of Part IV of this Chapter.

B. The provisions of this Section shall apply where a policy or other written evidence of insurance is coupled by specific reference with another policy or written evidence of insurance in existence as of the effective date or issued thereafter.

C. Any written agreement in conflict with, modifying, or extending the coverage of any contract of insurance shall be deemed to be physically made a part of a policy or other written evidence of insurance, within the meaning of this Section, whenever such written agreement makes reference to such policy or evidence of insurance and is sent to the holder of such policy or evidence of insurance by United States mail, postage prepaid, at such holder's last known address as shown on such policy or evidence of insurance, by electronic transaction in accordance with the Louisiana Uniform Electronic Transactions Act, R.S. 9:2601 et seq., or is personally delivered to such holder.