In Premier Medical Management Systems, Inc. v. California Ins. Guarantee Association (2006) 136 Cal.App.4th 464, workers compensation insurers asked the Workers Compensation Appeals Board (WCAB) to determine whether a medical management company was improperly representing physicians in workers compensation proceedings. (Premier Medical, supra, 136 Cal.App.4th at p. 468.) The medical management company then sued the insurers for acting to delay payment. (Id. at pp. 468, 476.) The trial court denied the insurer's anti-SLAPP motion, but the Court of Appeal reversed, holding that the insurers' conduct in petitioning the WCAB was protected activity that formed the basis for plaintiffs' lawsuit. (Ibid.)