The Secretary is hereby authorized, in the exercise of sound discretion, to issue a letter of concern to a physician whose conduct does not warrant formal disciplinary action by the Board, but whose action does warrant a letter of concern to apprise the physician of a potential for further action by the Board. Letters of concern shall remain in the confidential investigative file of the physician to whom the letter is issued.
Okla. Admin. Code § 435:5-1-5