The carrier shall file current medical reports with the board under the following conditions:(1) after the expiration of four weeks of disability;(2) when filing a notice of controversion based on medical grounds;(3) upon receipt of narrative reports submitted by the treating doctor pursuant to §42.40 of this subchapter (relating to Required Reports: Subsequent Reports);(4) when filing an A-2 giving return to work date or release to return to work date;(5) when filing an A-4 showing additional lost time;(6) when requesting a prehearing conference;(7) when filing a CSA;(8) when filing an A-2 lump sum showing payment for permanent partial disability resulting from a specific injury; and(9) when requested by the board.