(a) For patient events occurring on or after January 1, 2009, as specified by DSHS, facilities shall file event files according to the following schedule as shown in paragraphs (1) - (4) of this subsection:(1) Each event claim covering patient events occurring between January 1 and March 31, inclusive, shall be submitted no later than June 1 of the calendar year in which the discharge occurred.(2) Each event file covering patient events occurring between April 1 and June 30, inclusive, shall be submitted no later than September 1 of the calendar year in which the discharge occurred.(3) Each event file covering patient events occurring between July 1 and September 30, inclusive, shall be submitted no later than December 1 of the calendar year in which the discharge occurred.(4) Each event file covering patient events occurring between October 1 and December 31, inclusive, shall be submitted no later than March 1 of the year following the year in which the discharge occurred.(b) Extensions to processing due dates may be granted by DSHS in response to a written request signed by the facility's chief executive officer. Requests must be in writing, must be received at least 5 working days prior to the due date and must be accompanied by adequate justification for the delay. A timely written request shall constitute a stay (delay) of the due date until a decision is issued by DSHS.