Except as provided in RCW 48.18.130, each such policy delivered or issued for delivery to any person in this state shall contain the provisions as specified in RCW 48.20.042 to 48.20.152, inclusive, in the words in which the same appear; except, that the insurer may, at its option, substitute for one or more of such provisions corresponding provisions of different wording approved by the commissioner which are in each instance not less favorable in any respect to the insured or the beneficiary. Each such provision shall be preceded by the applicable caption shown or, at the insurer's option, by such appropriate individual or group caption or subcaption as the commissioner may approve.