Any hospital service corporation, medical service corporation or health service corporation which, on or after July 1, 1986, delivers or issues for delivery in this state any subscriber contract under the provisions of this article, shall make available for purchase, at a reasonable rate, supplemental insurance coverage for continuum of care services pursuant to article five-d, chapter sixteen of this code: Provided, That any insurance carrier required to provide supplemental insurance coverage for continuum of care services hereunder shall not be required to expend funds for underwriting such supplemental coverage until the continuum of care board, in cooperation with the West Virginia state Insurance Commissioner, shall have completed a written master plan related to insurance coverage as set forth in section five, article five-d, chapter sixteen of the Code of West Virginia, 1931, as amended, including, but not limited to, the specific standards and coverages to be provided in such supplemental coverage: Provided, however, That a public hearing shall be held pursuant to the provisions of chapter twenty-nine-a of this code applicable to such proceedings prior to the considerations of the aforesaid plan by said board. The rates for continuum of care coverage shall accurately reflect the cost of such coverage and shall not be subsidized by the rate structure for any other coverage.