Does the doctrine of exhaustion of administrative remedies apply to workers' compensation claims?

3 Both the demurrer and this appeal were based solely on the doctrine of exhaustion of administrative remedies. We therefore have no occasion to determine whether, in the context of the civil service and workers' compensation systems, there are other grounds to challenge some of the causes of action. (See e.g., Cole v. Fair Oaks Fire Protection Dist. (1987) 43 Cal.3d 148, 233 Cal.Rptr. 308, 729 P.2d 743.) We hold only that neither the doctrine of exhaustion nor that of issue preclusion bars this case on all of its tendered theories.