No insurer once having issued or delivered a policy providing malpractice insurance in this state may cancel the policy, except for one or more of the following reasons:
(a) The named insured fails to discharge any of his or her obligations to pay premiums for the policy or any installment of the policy within a reasonable time of the due date;
(b) The policy was obtained through material misrepresentation;
(c) The insured violates any of the material terms and conditions of the policy; or
(d) Reinsurance is unavailable. The insurer shall supply sufficient proof of the unavailability to the commissioner.
(e) Any purported cancellation of a policy providing malpractice insurance attempted in contravention of this section is void.