Wash. Rev. Code § 48.46.390
With respect to the provisions of health maintenance agreements as set forth in RCW 48.46.380, there shall be no liability on the part of, and no cause of action of any nature shall arise against, the insurance commissioner, the commissioner's agents, or members of the commissioner's staff, or against any health maintenance organization, its authorized representative, its agents, its employees, for providing to the health maintenance organization information as to reasons for cancellation or refusal to issue or renew, for libel or slander on the basis of any statement made by any of them in any written notice of cancellation or refusal to issue or renew, or in any other communications, oral or written, specifying the reasons for cancellation or refusal to issue or renew or the providing of information pertaining thereto, or for statements made or evidence submitted in any hearing conducted in connection therewith.
RCW 48.46.390