There is hereby established in the Treasury of the United States a fund to be known as the “Nonrecurring expenses fund” (the Fund): Provided, That unobligated balances of expired discretionary funds appropriated in this or any succeeding fiscal year from the General Fund of the Treasury to the Department of Health and Human Services by this or any other Act may be transferred (not later than the end of the fifth fiscal year after the last fiscal year for which such funds are available for the purposes for which appropriated) into the Fund: Provided further