Each hospital filing an application or request for a change in rate schedules or other changes with the board pursuant to section twenty-one of this article shall notify the director of the office of consumer advocacy established pursuant to section sixteen, article two, chapter thirty-three of this code of said application by submitting a copy of the same to the office of consumer advocacy. Each request shall include any proposed increase or decrease of the rates and shall be filed on or before the date the rate request or application is filed with the board.