(1) No adjustment can be made to a rate more than:

(a) One hundred twenty days after the field audit narrative and summary is sent to the provider; or

(b) One hundred twenty days after a preliminary settlement becomes a final settlement.

(2) A final settlement that is concluded within the one hundred twenty-day time limits could only be reopened to adjust prospective rates that are based upon errors or omissions.

(3) Only adjustments to prospective rates (and the related computations) resulting from errors or omissions can be reviewed if a timely request is filed according to the provisions of WAC 388-835-0950.