Wash. Admin. Code § 182-516-0145
(1) For irrevocable trusts that contain both assets of the beneficiary and third-party assets, the medicaid agency or the agency's designee treats the assets of the beneficiary under the self-settled trust rule in effect as of the date of the trust's establishment:
(a) After August 11, 1993:
[Statutory Authority: RCW 41.05.021 and 41.05.160. WSR 19-02-047, § 182-516-0145, filed 12/27/18, effective 1/27/19. Statutory Authority: RCW 41.05.021, 41.05.160 and 42 U.S.C. 1396p. WSR 18-04-037, § 182-516-0145, filed 1/30/18, effective 3/2/18.]