RCW 51.04.050: Health services provider's testimony not privileged.

In all hearings, actions or proceedings before the department or the board of industrial insurance appeals, or before any court on appeal from the board, any health services provider having theretofore examined or treated the claimant may be required to testify fully regarding such examination or treatment, and shall not be exempt from so testifying by reason of the relation of the health services provider to patient.