Cal. Civ. Code § 1798.303

If a person, whether or not acting under color of law, engages or attempts to engage in abusive litigation that infringes on or interferes with, or attempts to infringe on or interfere with, a legally protected health care activity, then an aggrieved person, provider, carrier, or other entity, including a defendant in the abusive litigation, may institute a civil action for injunctive, monetary, or other appropriate relief within three years after the cause of action accrues.