It is an unfair method of competition and an unfair or deceptive act or practice in the business of insurance for a malpractice insurer to refuse to offer insurance to a health care provider or hospital on the grounds that the health care provider or hospital has entered or intends to enter into valid written agreements with patients or prospective patients for the arbitration of cases or controversies arising out of the professional or business relationships between a patient and the health care provider or hospital.