California Code, Insurance Code - INS § 11589

No insurer who provides professional liability insurance for physicians and surgeons or dentists shall increase the premium for such insurance, impose a surcharge with respect to such insurance, or otherwise require additional compensation for such insurance, or institute or increase a deductible amount payable by the insured, because a notice of intention to commence an action has been given pursuant to Section 364 of the Code of Civil Procedure, unless a complaint has been served on the physician and surgeon or dentist with respect to such action.