This section does not apply to compensation: for a serious disability under § 9–630 of this title; or payable by the Subsequent Injury Fund. Subject to the consent of the Commission, an insurer or self–insurer may convert an award of compensation for permanent partial disability, minus any attorney’s fees, to a lump sum if the initial award did not exceed 51 weeks. An award may not be discounted because of a lump–sum payment.