Iowa Code § 148.12: Voluntary agreements.

The board, after due notice and hearing, may issue an order to revoke, suspend, or restrict a license to practice medicine and surgery or osteopathic medicine and surgery, or to issue a restricted license on application if the board determines that a physician licensed to practice medicine and surgery or osteopathic medicine and surgery or an applicant for licensure has entered into a voluntary agreement to restrict the practice of medicine and surgery or osteopathic medicine and surgery in another state, district, territory, country, or an agency of the federal government. A certified copy of the voluntary agreement shall be considered prima facie evidence.