Policy must contain entire contract.

RCW 48.18.190
in effect
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No agreement in conflict with, modifying, or extending any contract of insurance shall be valid unless in writing and made a part of the policy. No agreement in conflict with, modifying, or extending any contract of insurance shall be valid unless in writing and made a part of the policy.
Source: WA Statutes (Official Site)URL: https://app.leg.wa.gov/RCW/default.aspx?cite=48.18&full=trueFetched: 6/29/2026

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RCW 48.18.190 — Policy must contain entire contract | Revised Code of Washington | Corpus