Any essential rural health care provider which is denied, rejected, or terminated from serving as a participating provider in a health benefit plan shall have the right of hearing and appeal before the Commissioner, or his or her designee, if that provider believes there has been a violation of this chapter and of judicial appeal as provided in Chapter 2 of this title. To the extent proprietary materials, trade secrets, rate data, or other materials not generally known to the public are presented at a hearing or an appeal, such information shall be admissible but shall be sealed by the Commissioner and held as confidential and shall not be subject to Article 4 of Chapter 18 of Title 50.