Oregon Revised Statutes Corporations and Partnerships § 58.196

(1) A domestic professional corporation may merge with one or more domestic professional corporations if the professional corporations are organized to render the same professional service or services.

(2) Foreign professional corporations and domestic professional corporations that are organized to render the same professional service or services may merge unless the mergers are prohibited by the regulatory boards having jurisdiction of the professional corporations in their respective states of incorporation.

(3) A domestic professional corporation may merge with one or more domestic professional corporations which are organized to render different professional service or services only if the mergers are expressly authorized by the applicable regulatory boards.

(4) Foreign professional corporations and domestic professional corporations which are organized to render different professional service or services may merge only if the mergers are expressly authorized by the regulatory boards having jurisdiction of the corporations in their respective states of incorporation.