Oregon Revised Statutes Insurance § 742.405

(1) No insurer may require membership in a professional association as a condition of issuance of medical malpractice insurance to a physician. However, nothing in this subsection prohibits an insurer from requiring as a condition of coverage of a nonmember that the nonmember agrees to be subject to reasonable risk management, loss control or other similar programs and conditions to which members are subject, whether imposed by the insurer or the association.

(2) No insurer who issues medical malpractice insurance to a physician may assess any surcharge or offer any discount to the physician based on whether or not the physician is a member of a professional association.

(3) For purposes of this section, joint underwriting associations and risk retention groups shall be considered insurers.